Re: Mystery Ethernet Address [7:8746]
I captured several frames with MACs of 45-00-. They are [Ethernet[IP/TCP]] frames missing the first 8 bytes, as Priscilla guessed. The Switch is not incrementing CRC errors so my guess is that the nic/driver has a bug. I have so far seen a couple different apps within the weird frames so I see no reason to believe that it is a particular apps triggering the bug. I am only getting these 45-00-... MACs from one server and it is HEAVILY used, maybe the load on the server, NIC, driver triggers the bad framing? DaveC Michael Cohen wrote: Has anyone ever heard of network traffic that's sourced from a multicast ethernet address? I've seen error messages on a Catalyst 4000 that reads: %SYS-4-P2_WARN- 1/Invalid traffic from multicast source address 45-00-05-dc-73-a6 on port 1/1 I know that address isn't a multicast address but it's not registered to any Ethernet vendor codes either. Cisco says this is probably from a traffic generator (like SmartBits) but I don't think that's being run anywhere. Has anybody seen this MAC address or something like it? Thanks, -Michael Cohen Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=8941t=8746 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Mystery Ethernet Address [7:8746]
Me too: I have been getting a similar 45-00- mac error message from our cat 4000s since they were installed. Mine is coming from a server that I don't administer, so I have no idea what os/apps are running. I did determine that it was not the nic cards address. It doesn't seem to be causing any issues except creating bogus alarms. If I have time tonight I'll span the port and find what's inside the frames. I'll report back tomorrow. DaveC Michael Cohen wrote: Has anyone ever heard of network traffic that's sourced from a multicast ethernet address? I've seen error messages on a Catalyst 4000 that reads: %SYS-4-P2_WARN- 1/Invalid traffic from multicast source address 45-00-05-dc-73-a6 on port 1/1 I know that address isn't a multicast address but it's not registered to any Ethernet vendor codes either. Cisco says this is probably from a traffic generator (like SmartBits) but I don't think that's being run anywhere. Has anybody seen this MAC address or something like it? Thanks, -Michael Cohen Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=8782t=8746 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Does MPLS really live up to all its hype? [7:6151]
No Way!!! The Marketing people NEVER exagerate.:- MPLS does seem like a solution to a problem that was fixed some time ago...ie: fast-switching, CEF etc... DaveC NRF wrote: Mr. Berkowitz, please read this post and respond. Okay, I am going to run the risk of starting a religious war here. But I do have to ask, is MPLS really as great as people say? I know many people, on newsgroups and in real-life, champion MPLS as the perfect answer to the problems of the core Internet. Faster IP forwarding, traffic engineering, VPN capabilities, etc., it seems to have some powerful features.No doubt, this attitude is sparked by Juniper, which is using MPLS as a strategic weapon against Cisco, and since Juniper keeps eating Cisco's lunch, it stands to reason that MPLS has something to do with it. In fact, many network engineers treat MPLS as nothing less than the holy grail. But I wonder if the hype has begun to outstrip reality. For example, as a response to the LightReading test, Bill St. Arnaud of the Canadian carrier Canarie states The MPLS [multiprotocol label switching] throughput results confirmed our suspicions that MPLS does not buy you much except a big management headache. True, the throughput is higher, but not significantly higher than IP forwarding http://www.lightreading.com/document.asp?site=testingdoc_id=3909 And even the idea of higher throughput has been questioned by the mother of all networking, Radia Perlman: Originally [MPLS] was designed to make it possible to build fast routers, but then, using techniques such as [trie searches, parallelism, K-ary searches] people built routers fast enough on native IP packets. So now MPLS is thought to be mostly a technique for classifying the type of packet for quality of service or for assigning routes for traffic engineering... (Interconnections, 2nd Ed., p. 347-348). And I think we would all agree that anything Ms. Perlman says must be given serious weight. So I must ask, does MPLS really live up to all the hype? Is it really the greatest thing since sliced bread? How much of MPLS really is an improvement on today's network, and how much of it is just a bunch of (probably Juniper) marketing bullshi*? Has any company ever worked for a company that evaluated MPLS and then decided not to use it, and if so, what were the reasons? Thanx for all the non-flame responses FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6203t=6151 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: TR Int Errr [7:6112]
1. Swap the cables between the 2502 and 2504 (if you haven't already) 2. Swap the ports on the MAU. If 1 and 2 do not work get rid of the 2502. Even Cisco's hardware breaks. HTH DaveC RamG wrote: I have TWO routers with TR interface - 2502/2504. I am using IBM MAU. Connected both the routers TR int to MAU port 1 2. Router 2504 TR Int is up and running fine. I am having problem with 2502. There is no fault on MAU. What else could be the problem? I even changed ring speed on 2502. Yet it is still initializing and protocol is DOWN. I even tried changing media filters. Still no luck in troubleshooting. I am worried is my TR int gone for good, if so, then I will have to report the defect to the seller ASAP. Would appreciate any help. Hello Gang - I am having problem bring up TR int. Following is the output. R2502#show interface tokenring0 TokenRing0 is initializing, line protocol is down Hardware is TMS380, address is .30ba.4a52 (bia .30ba.4a52) MTU 4464 bytes, BW 16000 Kbit, DLY 630 usec, rely 255/255, load 1/255 Encapsulation SNAP, loopback not set, keepalive set (10 sec) ARP type: SNAP, ARP Timeout 04:00:00 Ring speed: 16 Mbps Duplex: half Mode: Classic token ring station Group Address: 0x, Functional Address: 0x0800 Ethernet Transit OUI: 0x00 Last input never, output never, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 54 interface resets 0 output buffer failures, 0 output buffers swapped out 59 transitions R2502#show config Using 774 out of 32762 bytes ! version 12.0 service timestamps debug uptime service timestamps log uptime no service password-encryption service udp-small-servers service tcp-small-servers ! hostname R2502 ! no logging console enable password ram ! ip subnet-zero no ip domain-lookup ! ! ! interface Serial0 bandwidth 64 no ip address no ip directed-broadcast encapsulation ppp no ip route-cache no ip mroute-cache ! interface Serial1 bandwidth 64 ip address 10.1.5.1 255.255.255.0 no ip directed-broadcast encapsulation ppp no ip route-cache no ip mroute-cache ! interface TokenRing0 no ip address no ip directed-broadcast no ip route-cache no ip mroute-cache ring-speed 16 ! ip classless ! ! line con 0 transport input none line aux 0 transport input all line vty 0 4 login ! end Thanks / RamG FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6204t=6112 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: WAN problem with ATM - Please help !!! [7:6212]
Sounds like a split horizon problem. Split horizon is disabled on frame-relay physical interfaces as well as multipoint subinterfaces. I believe that the same is true with ATM, but I have never specifically verified that. Need more info to confirm. Please post the configs of the ATM setup. DaveC Hamid wrote: Hi I have to 1601 Routers in 2 branch offices connecting them to a 3640 router in a Central office over ATM. I have configured EIGRP routing and the encapsulation is ATM-dxi. The is that, both of the branch offices have connectivity to the central sites and have no problems with the central office. But the branch offices can't see each other. I have tested it it on the 1601 routers, none of them can see eachother. I don't think the problem is about the ROUTING because changing the encapsulation to FRAME-RELAY solves everything. Everything works allright with FRAME-RELAY encapsulation. But it won't work with ATM-dxi. Can someone tell me please what the problem is? Thanks in advance Hamid FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6223t=6212 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Does MPLS really live up to all its hype? [7:6151]
of those functions already has an established (and often better) solution. Would any vendor be recommending MPLS if it did not require an upgrade? $ I vote:Floor Wax :- PS: Where can I find the article? DaveC Irwin Lazar wrote: A collegue of mine wrote an article some time back entitled MPLS: Desert Toping or Floor Wax MPLS originally was created to solve the problem of slow, software-based routers. Hardware-based (aka Layer 3 switches) routers alleviated that requirement. Since then MPLS is being used for all sorts of different functions including: - traffic engineering - IP-based virtual private networks - L2 encapsulation within L3 networks - Reservation of L1/2 resources by L3-based control mechanisms IMHO, the basic goal of MPLS is to converge the various L1/2-specific control mechanisms into a single, unified control plane capable of provisioning and managing a path across a packet-based network infrastructure. But who knows where we will be in five years. Irwin -Original Message- From: David Chandler [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 29, 2001 8:07 AM To: [EMAIL PROTECTED] Subject: Re: Does MPLS really live up to all its hype? [7:6151] No Way!!! The Marketing people NEVER exagerate.:- MPLS does seem like a solution to a problem that was fixed some time ago...ie: fast-switching, CEF etc... DaveC NRF wrote: Mr. Berkowitz, please read this post and respond. Okay, I am going to run the risk of starting a religious war here. But I do have to ask, is MPLS really as great as people say? I know many people, on newsgroups and in real-life, champion MPLS as the perfect answer to the problems of the core Internet. Faster IP forwarding, traffic engineering, VPN capabilities, etc., it seems to have some powerful features.No doubt, this attitude is sparked by Juniper, which is using MPLS as a strategic weapon against Cisco, and since Juniper keeps eating Cisco's lunch, it stands to reason that MPLS has something to do with it. In fact, many network engineers treat MPLS as nothing less than the holy grail. But I wonder if the hype has begun to outstrip reality. For example, as a response to the LightReading test, Bill St. Arnaud of the Canadian carrier Canarie states The MPLS [multiprotocol label switching] throughput results confirmed our suspicions that MPLS does not buy you much except a big management headache. True, the throughput is higher, but not significantly higher than IP forwarding http://www.lightreading.com/document.asp?site=testingdoc_id=3909 And even the idea of higher throughput has been questioned by the mother of all networking, Radia Perlman: Originally [MPLS] was designed to make it possible to build fast routers, but then, using techniques such as [trie searches, parallelism, K-ary searches] people built routers fast enough on native IP packets. So now MPLS is thought to be mostly a technique for classifying the type of packet for quality of service or for assigning routes for traffic engineering... (Interconnections, 2nd Ed., p. 347-348). And I think we would all agree that anything Ms. Perlman says must be given serious weight. So I must ask, does MPLS really live up to all the hype? Is it really the greatest thing since sliced bread? How much of MPLS really is an improvement on today's network, and how much of it is just a bunch of (probably Juniper) marketing bullshi*? Has any company ever worked for a company that evaluated MPLS and then decided not to use it, and if so, what were the reasons? Thanx for all the non-flame responses FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6238t=6151 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Wanna Be a CCIE? Try This One [7:6076]
Have you tried an inboud distribution list on Router A's area 1
interfaces. If router A doesn't learn the Router D routes thru those
interfaces it should then use Area 0.
Worth a try.
DaveC
Kevin Schwantz wrote:
Thanks for the recommendations. Firstly, let me explain why I need the
routing to behave in such a way. The reasons are purely geographical and I
want to reduce latency. Routers A and B are in London and connected back to
back via FastEth. Routers C and D are in and SanJose and NewYork
respectively(Connected to both London routers via FR).
I certaintly won't want traffic originating from RouterA ( London )
destined
for RouterD (NewYork) to have to go to SanJose first. It would be much
better if the hop is A-B-D instead of A-C-D.
Schwantz
EA Louie wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
... or route-map the router D network(s) to go through Router B at Router
A
- Original Message -
From: Chris Larson
To:
Sent: Tuesday, May 29, 2001 7:24 AM
Subject: RE: Wanna Be a CCIE? Try This One [7:6076]
Place a summary route to null 0 for the networks on Router D on your
OSPF
routers and set the metrics appropriately for the summary route
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Kevin Schwantz
Sent: Tuesday, May 29, 2001 10:03 AM
To: [EMAIL PROTECTED]
Subject: Re: Wanna Be a CCIE? Try This One [7:6076]
routerArouterB
AREA0AREA0
||
routerC routerD
AREA1-AREA1
Since we are on the topic of OSPF, could someone help me out on the
scenario
above?
Routers A and B have interfaces in Area 0 and Area1. I want traffic
from
routerA destined for routerD to go via router B. This is not the case
in
my
network because I realise that routerA prefers Intra-Area routes and
thus
would route traffic to routerD via routerC.
What tweaks must I make in order to force the traffic from routerA to
routerD to go via routerB ? Someone suggested building a GRE tunnel
between
routerA and routerB and then configure the tunnel to be in AREA1.
Any suggestions?
Kevin
W. Alan Robertson wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
Guys,
The actual traffic will not be routed up to area 0... Area 0 has
been
extended
down to R2, so R2 is now a backbone router. R2 has interfaces in 3
areas
now:
Area1, Area2, and Area0 by means of it's virtual link.
Any traffic originating in Area2 destined for Area1 will be routed
directly
by
R2. This satisfies the Interarea traffic must traverse the
backbone
rule,
because R2 *is* a backbone router.
This is not theory... It is fact.
Alan
- Original Message -
From: Andrew Larkins
To:
Sent: Monday, May 28, 2001 10:13 AM
Subject: RE: Wanna Be a CCIE? Try This One [7:6076]
agreedto area 0 then on to the intended area
-Original Message-
From: Circusnuts [mailto:[EMAIL PROTECTED]]
Sent: 28 May 2001 15:50
To: [EMAIL PROTECTED]
Subject: Re: Wanna Be a CCIE? Try This One [7:6076]
Chuck- my answer is Yes. The traffic from the Virtual Linked
psuedo-ABR
passes back to Area 0, before it's sent onto the intended Area
(even
if
it's
directly connected).
Phil
- Original Message -
From: Chuck Larrieu
To:
Sent: Sunday, May 27, 2001 8:59 PM
Subject: Wanna Be a CCIE? Try This One [7:6076]
Ever wonder what the CCIE candidates talk about on the CCIE list?
The following message came through today. I thought the bright
folks
on
this
list might be curious, and might want to venture an answer.
Begin original question:
Guys,
I wonder if there is anybody who remembers the discussion on
Virtual
Links in OSPF. It was posted some time ago but I can't seem to
find
it.
The scenario was something like this:
___ ___
|Area 0 | |Area1||Area2|
|R0|--| R1 |--| R2 |
|__| |_||_|
There is a virtual link from area 2 to Area 0 via Area1. Traffic
needs
to
get to R1 in Area 1 from R2 in Area 2. Assume that the virtual
link
has
to
use R1 (To create the V.Link). Does the traffic flow passed R1
(in
Area
1)
to Area 0 and then back to area 1, or does the actual flow just
to
R1
from
R2.
I cant remember the conclusion, and I cant seem to find it on the
archives.
Quite interesting issues.
End of original question
Chuck
One IOS
Re: Does MPLS really live up to all its hype? [7:6151]
I'll try again... Yes: It is/can be used for all types of different functions. BUT each of those functions already has an established (and often better) solution. Would any vendor be recommending MPLS if it did not require an upgrade? $ I vote:Floor Wax :- PS: Where can I find the article? DaveC Irwin Lazar wrote: A collegue of mine wrote an article some time back entitled MPLS: Desert Toping or Floor Wax MPLS originally was created to solve the problem of slow, software-based routers. Hardware-based (aka Layer 3 switches) routers alleviated that requirement. Since then MPLS is being used for all sorts of different functions including: - traffic engineering - IP-based virtual private networks - L2 encapsulation within L3 networks - Reservation of L1/2 resources by L3-based control mechanisms IMHO, the basic goal of MPLS is to converge the various L1/2-specific control mechanisms into a single, unified control plane capable of provisioning and managing a path across a packet-based network infrastructure. But who knows where we will be in five years. Irwin -Original Message- From: David Chandler [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 29, 2001 8:07 AM To: [EMAIL PROTECTED] Subject: Re: Does MPLS really live up to all its hype? [7:6151] No Way!!! The Marketing people NEVER exagerate.:- MPLS does seem like a solution to a problem that was fixed some time ago...ie: fast-switching, CEF etc... DaveC NRF wrote: Mr. Berkowitz, please read this post and respond. Okay, I am going to run the risk of starting a religious war here. But I do have to ask, is MPLS really as great as people say? I know many people, on newsgroups and in real-life, champion MPLS as the perfect answer to the problems of the core Internet. Faster IP forwarding, traffic engineering, VPN capabilities, etc., it seems to have some powerful features.No doubt, this attitude is sparked by Juniper, which is using MPLS as a strategic weapon against Cisco, and since Juniper keeps eating Cisco's lunch, it stands to reason that MPLS has something to do with it. In fact, many network engineers treat MPLS as nothing less than the holy grail. But I wonder if the hype has begun to outstrip reality. For example, as a response to the LightReading test, Bill St. Arnaud of the Canadian carrier Canarie states The MPLS [multiprotocol label switching] throughput results confirmed our suspicions that MPLS does not buy you much except a big management headache. True, the throughput is higher, but not significantly higher than IP forwarding http://www.lightreading.com/document.asp?site=testingdoc_id=3909 And even the idea of higher throughput has been questioned by the mother of all networking, Radia Perlman: Originally [MPLS] was designed to make it possible to build fast routers, but then, using techniques such as [trie searches, parallelism, K-ary searches] people built routers fast enough on native IP packets. So now MPLS is thought to be mostly a technique for classifying the type of packet for quality of service or for assigning routes for traffic engineering... (Interconnections, 2nd Ed., p. 347-348). And I think we would all agree that anything Ms. Perlman says must be given serious weight. So I must ask, does MPLS really live up to all the hype? Is it really the greatest thing since sliced bread? How much of MPLS really is an improvement on today's network, and how much of it is just a bunch of (probably Juniper) marketing bullshi*? Has any company ever worked for a company that evaluated MPLS and then decided not to use it, and if so, what were the reasons? Thanx for all the non-flame responses FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=6243t=6151 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Wanna Be a CCIE? Try This One [7:6076]
I've been looking at the route-maps as well. Question: How can the route-map matches tell the difference between the routes arriving via area 0 and those from area 1. To set the cost of just those learned from area 1 it would have to be able to tell the difference. If you match the RD routes to change the metric wouldn't it change the metric for both Area 0 and Area 1 RD routes. Matching the routes then setting the next-hop to RB would give the same result as the distribute list. (wouldn't it?) Considering what he wants to do; I would agree that policy routing is the way to go but do you manipulate the route-map commands? So far there hasn't been a bullet proof suggestion.. DaveC Peter I. Slow, CCNP Voice Specialist wrote: Or use a route-map to increase the path cost... Otherwise you lose that filtered path as a backup route... Peter Slow, CCNP Voice Specialist Network Engineer Planetary Networks 535 West 34th Street New York, NY 10001 Cell:(516) 782.1535 Desk: (646) 792.2395 Mail: [EMAIL PROTECTED] Fax:(646) 792.2396 - Original Message - From: David Chandler To: Sent: Tuesday, May 29, 2001 12:00 PM Subject: Re: Wanna Be a CCIE? Try This One [7:6076] Have you tried an inboud distribution list on Router A's area 1 interfaces. If router A doesn't learn the Router D routes thru those interfaces it should then use Area 0. Worth a try. DaveC Kevin Schwantz wrote: Thanks for the recommendations. Firstly, let me explain why I need the routing to behave in such a way. The reasons are purely geographical and I want to reduce latency. Routers A and B are in London and connected back to back via FastEth. Routers C and D are in and SanJose and NewYork respectively(Connected to both London routers via FR). I certaintly won't want traffic originating from RouterA ( London ) destined for RouterD (NewYork) to have to go to SanJose first. It would be much better if the hop is A-B-D instead of A-C-D. Schwantz EA Louie wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... ... or route-map the router D network(s) to go through Router B at Router A - Original Message - From: Chris Larson To: Sent: Tuesday, May 29, 2001 7:24 AM Subject: RE: Wanna Be a CCIE? Try This One [7:6076] Place a summary route to null 0 for the networks on Router D on your OSPF routers and set the metrics appropriately for the summary route -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Kevin Schwantz Sent: Tuesday, May 29, 2001 10:03 AM To: [EMAIL PROTECTED] Subject: Re: Wanna Be a CCIE? Try This One [7:6076] routerArouterB AREA0AREA0 || routerC routerD AREA1-AREA1 Since we are on the topic of OSPF, could someone help me out on the scenario above? Routers A and B have interfaces in Area 0 and Area1. I want traffic from routerA destined for routerD to go via router B. This is not the case in my network because I realise that routerA prefers Intra-Area routes and thus would route traffic to routerD via routerC. What tweaks must I make in order to force the traffic from routerA to routerD to go via routerB ? Someone suggested building a GRE tunnel between routerA and routerB and then configure the tunnel to be in AREA1. Any suggestions? Kevin W. Alan Robertson wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Guys, The actual traffic will not be routed up to area 0... Area 0 has been extended down to R2, so R2 is now a backbone router. R2 has interfaces in 3 areas now: Area1, Area2, and Area0 by means of it's virtual link. Any traffic originating in Area2 destined for Area1 will be routed directly by R2. This satisfies the Interarea traffic must traverse the backbone rule, because R2 *is* a backbone router. This is not theory... It is fact. Alan - Original Message - From: Andrew Larkins To: Sent: Monday, May 28, 2001 10:13 AM Subject: RE: Wanna Be a CCIE? Try This One [7:6076] agreedto area 0 then on to the intended area -Original Message- From: Circusnuts [mailto:[EMAIL PROTECTED]] Sent: 28 May 2001 15:50 To: [EMAIL PROTECTED] Subject: Re: Wanna Be a CCIE? Try This One [7:6076] Chuck- my answer is Yes. The traffic from the Virtual Linked psuedo-ABR passes back to Area 0, before it's sent onto t
Re: ATM int are up, unable to ping. [7:5901]
The Pings: Not 2 minutes before your post came across the list; I remembered why you can not ping the local ip on a MULTI-POINT interfaces. I was not thinking about pvc encapsulation. The ping still has to go out and if you don't tell the router which pvc to send it on it just drops it. (Yes/No) The Clocking: I have only once tied the ATM PAs back-to-back, and never experimented with dual clocking. I think it would work. Maybe with some error, but it could still work, depending on how sensitive the SONET is to the timing. Do you have any thoughts on that? Thanks for the reply DaveC Daniel Cotts wrote: David is correct. The atm clock internal is only required on one end. I looked at the AIP documentation to reply to the first e-mail. That shows clock on both ends. In response to David's reply I looked at a config on a production network. Clocking one end is correct. Regarding pinging one's own interface. Think Frame Relay not Serial links. -Original Message- From: David Chandler [mailto:[EMAIL PROTECTED]] Sent: Saturday, September 27, 1997 12:35 PM To: Daniel Cotts Subject: Re: ATM int are up, unable to ping. [7:5901] Questions: 1. Isn't the atm clock internal applied to just one router which intern will provide clock to the other? 2. If you do internal clocking on both ends would you not get some clock slips? (intermitently atleast) 3. Why would an ATM interface be different than other type serial interafaces with regard to the pings. ie: the remote router basically replys for the local routers serial ip address. I'm afraid I don't remember what mechanism is used so that a router can ping it's own serial interface. Sorry if this is nit-picking. TIA DaveC Daniel Cotts wrote: Add a atm clock internal to each interface. I'm not familiar with your encapsulation method. If the above doesn't work try changing to aal5snap. You will not be able to ping your local interface unless you also create a map statement for it. When you have this up and running then try doing subinterfaces. You could have one large map-list or you could create a map-list for each subinterface. More typing but much easier to troubleshoot several months later. -Original Message- From: Deloso, Elmer G (WPNSTA Yorktown) [mailto:[EMAIL PROTECTED]] Sent: Friday, May 25, 2001 9:21 AM To: [EMAIL PROTECTED] Subject: ATM int are up, unable to ping. [7:5901] Hi, everyone. I've just installed a single-mode ATM module on each of my 4500's, both routers recognize the card. I configure them as shown below, however I can't ping even the local ATM interface even though it shows as being up. I also icluded the debug output. Please tell me what's not right. Thanks in advance. Elmer Deloso RouterA#ping 195.1.1.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 195.1.1.1, timeout is 2 seconds: . Success rate is 0 percent (0/5) RouterA#ping 195.1.1.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 195.1.1.2, timeout is 2 seconds: . Success rate is 0 percent (0/5) RouterA#sh run Building configuration... Current configuration: ! version 11.3 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname RouterA ! ! ! ! interface Ethernet0 no ip address shutdown media-type 10BaseT ! interface Ethernet1 no ip address shutdown media-type 10BaseT ! interface Serial0 no ip address no ip mroute-cache shutdown no fair-queue ! interface Serial1 no ip address shutdown ! interface ATM0 ip address 195.1.1.2 255.255.255.0 atm max-paks-vc 40 atm pvc 1 0 32 aal5nlpid map-group 1 ! no ip classless ! ! map-list 1 ip 195.1.1.1 atm-vc 1 broadcast ! line con 0 line aux 0 line vty 0 4 login ! end RouterA#sh ver Cisco Internetwork Operating System Software IOS (tm) 4500 Software (C4500-IS-M), Version 11.3(11b), RELEASE SOFTWARE (fc1) Copyright (c) 1986-2001 by cisco Systems, Inc. Compiled Fri 02-Mar-01 14:28 by cmong Image text-base: 0x60008930, data-base: 0x6078 ROM: System Bootstrap, Version 5.3(16) [richardd 16], RELEASE SOFTWARE (fc1) BOOTFLASH: 4500 Software (C4500-BOOT-M), Version 11.1(7), RELEASE SOFTWARE (fc2) RouterA uptime is 6 minutes System restarted by reload System image file is flash:c4500-is-mz.113-11b.bin, booted via flash cisco 4500 (R4K) processor (revision B) with 16384K/4096K bytes of memory. Processor board ID 03454024 R4700 processor, Implementation 33, Revision 1.0 G.703/E1 software, Version 1.0. Bridging software
Re: Can fast switching/CEF handle QoS/ext. [7:5180]
In addition to these links, Packet Magizine has a few very good technical overviews of CEF and its capabilities. search CCO for CEF Packet magazine DaveC Tony Medeiros wrote: Try these links. Lots of the infromation is scattered around. Of course it's all IOS version and platform dependent http://www.cisco.com/univercd/cc/td/doc/product/software/ios111/cc111/bgppro p.htm http://www.cisco.com/warp/customer/cc/pd/rt/7200/nse1/prodlit/nse1_ds.htm http://www.cisco.com/warp/public/105/20.html Hope this helps, Tony M. #6172 - Original Message - From: NRF To: Sent: Sunday, May 20, 2001 4:56 AM Subject: Can fast switching/CEF handle QoS/ext. [7:5180] I would like to know if anybody can tell me how or even if fast-switching and CEF handle special packet handling decisions like extended access-lists, policy-routing, QoS (like queuing, CAR, WRED). From reading the CiscoPress book Inside Cisco IOS Software Architecture, I understand how fast-switching and CEF work in normal packet forwarding situations. But what happens when more intelligence is needed in packet forwarding, like in situations mentioned above? I am well aware of the command ip route-cache policy, which seems to imply that a policy route can be cached for fast-switching. I am interested in finding out how this really works. Because I can make a policy route that matches on so many different things (source IP, IP precedence/TOS value, packet length,etc.) and can change so many different things (next hop, default next hop, prec/TOS, etc.), it seems to me that the tree or trie or whatever logic structure IOS may use would quickly become overwhelmed by the sheer number of possibilities. Which makes me wonder whether the router can really cache the policy at all, or if it can, should it (as opposed to just process-switching the packet). Thanx FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=5187t=5180 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Strange destination MAC address on token-ring [7:5193]
The C0xx MAC addresses in token ring are known as function addresses. There are several different kinds: Some for Maintanence of the ring: Active Monitor Present MAC frame Standby Montior present MAC frame Ring Error Monitor Ring Parameter Server etc...etcetc Other for are user defined: C0008000-C00040 Yours C080 falls in the user defined catagory. A quick search pointed me to http://support.microsoft.com/support/kb/articles/Q99/7/45.ASP; It states it is a functional address used for IPX on token-ring. DaveC infosecurite wrote: Hello, Lot of packets on my token-ring network gots the destination mac address C080. It cause me some trouble because it seems that it's a multicast address (I'm not sure) so my firewall show in my log lot of drops. This not drop really in fact the communication because all is ok for my users. So I think that's this multicast mac address made the packet presented to lot of token-ring interfaces causing an big amount of non usefull network load. I try to explain that to my network administrator, but he do not know why we have that. Could you help me ? regards, steve __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=5196t=5193 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: BGP question [7:4973]
Relax You were talking to a salesman. Nod your head, have him/her pay for a good lunch; and ask to talk to one of the engineers. DaveC Rizzo Damian wrote: Hey folks, I have a quick question regarding BGP. We are looking for an alternative ISP for our Internet. One company we spoke with that offers a 100MB connection, said that in order to use their services we need to implement BGP on our Internet router. We currently utilize a class A address on our Internet router, and they said BGP will only work with Class C addresses. I don't know enough about BGP yet to argue this fact, so I turn to you to ask if you agree or disagree with this comment? Thanks a lot! -Rizzo FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=5056t=4973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Proxy-ARP Behavior [7:5075]
Just completed a lab on Proxy-ARP behavior, and thought I'd share the results. Last week there was a thread about proxy-arp and someone pointed out the cisco documentation which states the Cisco IOS software evaluates whether it has the BEST route to that host. If it does, the device sends an ARP Reply. I was not positive about what was meant by BEST route so I tested it out. ### Setup: #1. I setup a misconfigured host to generate the arps. 4.1.1.101/8 will ping 4.1.2.1 #2. R1, R2, R3 with subnets that included the host's address but with 4.1.1.x/24 addresses. #3. Sniffer to verify who is doing what. Assumptions: IP PROXY-ARP enabled. Router has a route for the arp'd subnet (not directly connected) ### Results: A proxy-arp is sent IF the following three conditions are met. #1. Arp received on an interface whose IP/Mask (subnet range) does not belong the the requested IP address of the arp. #2. The router has a route in the table to the requested subnet. (If #1 is true then it will NOT be directly connected.) #3. The routing table's next hop is NOT reached via the interface the arp came in on. Side notes: Tried the setup with rip, eigrp, ospf with various metrics AND static routes interface and next-hop. The routing protocol made no difference. The host (NT workstation) used the MAC of whoever responded first. Running HSRP made no difference other than the MAC address. # Please reply if there are other quirks, There is always some small detail/senerio that changes the behavior of these protocols. DaveC Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=5075t=5075 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ATM question [7:4452]
Sounds like they are giving you a PVP. (permanent virtual path) If that is true then they are correct whatever VCI you choose at the source will be the same VCI at the destination. In other words the Sprint ATM switches will not switch based on the VCI info in the cell header; it will only look at the VPI info. I am suprised that the carriers would be giving out PVPs. That sounds like the same mentality which was used when they were giving out IP address ranges. (If you have more than 100 users, you can have a Class A address) DaveC Kim Seng wrote: To the ATM guru, I have a ATM WAN via SPRINT from the HQ (Chicago) to 4 regional branch office (LA, FL, NY and CO). The PVC infomations that SPRINT provides to me after the circuit installation completed has only the Originating VPI and Terminating VPI. There are no information about the VCI. They said I can pick any number for the VCI. This is new to me. Can someone tell me that is true? I thought to configure PVC you need both the VPI/VCI that must match with the ingress ATM switch. Many thanks in advance. Kim. __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=4460t=4452 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: OT: Loopback [7:3973]
I'm believe that the loopbacks your are seeing are the keep-alive frames being sent out on the LAN. They should have the same source and destination MAC address with an ethertype 9000 or SNAP 9000 value. PS: you may want to verify the type/Snap value. 0x9000 is from memory. It's a good question. Everyone is bound to see them on the sniffers at some time. DaveC Tan Chee Leong wrote: Hi, I have been looking at the sniffer output and found that my router keeps sending out a LOOPBACK packet whose source and dest mac address is the router interface itself. It is sent periodically at 10 sec interval. Any way to turn this off? Sorry that it is not a study question. Cheers, Chee Leong FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=4171t=3973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: addressing/mask question [7:3727]
I wonder if they mean that it will not respond to the ARP if the router would then have to route the packet out the same interface that it came in on. (10.1.1.x/24) (10.1.2.x/24) R1---R2R3--| H2 | | H1 10.1.x.x/16 1. If H1 (which is misconfigured) wants to send a packet to H2 it will ARP; because it thinks H2 is local. 2. Both R1 and R2 could proxy-arp for H2. 3. If R1 proxy-arps it will then have to route the packet to R2. 4. R1 learned the router from R2 which is on the same broadcast domain so R1 will allow R2 to do the proxy-arp. 5. R2 may not know if it has the BEST ROUTE to H2 but 6. R1 knows that it doesn't have the best route because it would have to send it out the same interface. I'm gonna test this out and I'll keep you posted. DaveC Scott Meyer wrote: Thanks for the response. Do you have the link for this? How does the router determine if it has the best route? Does routing protocol choice have anything to do with this determination? Using RIP for example, the router only knows how many hops away a network is. It knows the best route to forward the packet, but doesn't know if there is another router with a better route that would have received the packet. Scott Meyer CCNA, CCDA, MCSE, etc [EMAIL PROTECTED] -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Wednesday, May 09, 2001 4:55 PM To: [EMAIL PROTECTED] Subject: Re: addressing/mask question [7:3727] Under proxy ARP, if the router receives an ARP Request for a host that is not on the same network as the ARP Request sender, and if the router has the best route to that host, then the router sends an ARP Reply packet giving its own local data link address. The host that sent the ARP Request then sends its packets to the router, which forwards them to the intended host. Scott, That is quoted from the CCO help pages. Essentially, both of your scenarios are true, except that the router only responds to the ARP if it has the BEST path to the host or service sought. HTH, Rob H. CCNP, CCDP, MCSE, CCA FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=4194t=3727 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Redistribution: OSPF to IGRP [7:3983]
I'm gonna take a shot: On R2 if you add: ip route 172.17.59.96 255.255.255.240 null 0 and under igrp add: redistribute static R4 should get the 172.17.59.96/28 route and send the traffic to R2. Once it gets to R2 the more specific routes with the /29 /30 masks should forward it into the OSPF domain. I'm pretty sure this will do it.. :) DaveC Virnoche, Phil wrote: Here is my problem: The major network is 172.17.0.0 (OSPF domain with /28, /29, /30) R2 -IGRP link/28-- R4 (IGRP domain /28) Mutual redistribution at R1... knowing that I have only 1 network (variably subnetted) how can I get a default network in R2 and make the whole network reachable from R4 ? r2#sho ip rou Gateway of last resort is not set 172.17.0.0/16 is variably subnetted, 9 subnets, 3 masks C 172.17.59.0/28 is directly connected, Serial0/0 C 172.17.59.16/28 is directly connected, BRI0/0 C 172.17.59.32/28 is directly connected, FastEthernet0/0 C 172.17.59.48/28 is directly connected, Serial0/1 O IA172.17.59.64/28 [110/112] via 172.17.59.3, 07:50:24, Serial0/0 I 172.17.59.80/28 [100/8576] via 172.17.59.50, 00:01:04, Serial0/1 O IA172.17.59.96/29 [110/70] via 172.17.59.3, 07:50:24, Serial0/0 O IA172.17.59.108/30 [110/118] via 172.17.59.3, 07:50:25, Serial0/0 O IA172.17.59.104/30 [110/65] via 172.17.59.1, 07:50:25, Serial0/0 r4#sho ip rou Gateway of last resort is not set 172.17.0.0/28 is subnetted, 6 subnets I 172.17.59.0 [100/10476] via 172.17.59.49, 00:00:18, Serial0 I 172.17.59.16 [100/160250] via 172.17.59.49, 00:00:18, Serial0 I 172.17.59.32 [100/8486] via 172.17.59.49, 00:00:18, Serial0 C 172.17.59.48 is directly connected, Serial0 I 172.17.59.64 [100/8576] via 172.17.59.49, 00:00:18, Serial0 C 172.17.59.80 is directly connected, Ethernet0 Philip G. Virnoche Sr. Network Engineer - ATT Wireless phone: 425.580.5239 cell: 206.601.3134 HAM AND EGGS - A day's work for a chicken; A lifetime commitment for a pig. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=4002t=3983 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Anybody know of a failover switch for serial connections? [7:4095]
I'm not positive of what you are looking for; but it sounds like you're looking for HSRP. With HSRP the STANDBY router will takeover incase the ACTIVE router fails. You can also set them up so that the standby router takes over incase the serial interfaces on the active router fails. (see STANDBY TRACKING command options) Failover takes about three seconds. If you use the a fast converging routing protocol it'll be ALMOST transparent to the end users. Check it out HSRP on CCO DaveC Edward Gomez wrote: Hi all, I am currently looking for a failover switch that will automatically switch my serial connections from one router to another in case of a router failure. Does anyone know of such a device. The device needs to be able to handle multiple serial (T1) connections. Thanks in advance! Eddie -- Edward J. Gomez, MCSE, CNE, CCNA Information Systems Manager ProxyMed, Inc 2555 Davie Road, Suite 110 Fort Lauderdale, Florida 33317 (954) 473-1001 x315 http://www.proxymed.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=4095t=4095 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Protocol Type 0x886F [7:3737]
After looking over Microsofts Loadbalancing white paper; it apears that microsoft is using a multicast MAC address for these heart beats. The switch is going the flood them across the vlan every time it gets one. Ask whoever maintains the Win 2000 servers why they have that enabled. They may not be aware what it is for. I'd keep my fingers crossed for this solution. If it is enabled for a reason AND the heart beats are actually a problem; you'll need to put the server cluster on a seperate VLAN. **There is a note about cisco routers (in the white paper) not liking the multicast MAC with the unicast IP address. It requires a static ARP entry in the router. 10% to 15% is that during a low traffic period? Is this causing slow responce or some other problem? Keep us updated. DaveC Andy Prima wrote: Thank you all for the answers. This frame consumes 10-15 % of total frames circling in my network. Any comment for this ? Can I filter it out? Is there any consideration on filtering? TIA, Andy -Original Message- From: Brian Dennis [mailto:[EMAIL PROTECTED]] Sent: Wednesday, May 09, 2001 12:09 PM To: Andy Prima; [EMAIL PROTECTED] Subject: RE: Protocol Type 0x886F [7:3737] It's a heartbeat frame for Windows NT Load Balancing Service. Brian Dennis, CCIE #2210 (RS)(ISP/Dial) CCSI #98640 5G Networks, Inc. [EMAIL PROTECTED] (925) 260-2724 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Andy Prima Sent: Tuesday, May 08, 2001 9:47 PM To: [EMAIL PROTECTED] Subject: Protocol Type 0x886F [7:3737] Dear all, I need help on protocol type 0x886F. It seems that this kind of Ethernet Broadcast is circling around my network and I do not have a clue what it really is. TIA andy FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=3756t=3737 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ATM AAL5 errors [7:3682]
#1. The source device encapsulates whatever traffic it has to send in a AAL5 PDU then segments the PDU and places the pieces of the PDU into the payload of the ATM cells. #2. AAL5 is almost always is used in UBR (unspecified bit rate) calls. ie: No garuntee from the carrier that they will deliver your cell to the destination. #3. During times of congestion the carrier will drop cells in a UBR call. #4. If a cell (or cells) are dropped within the carrier's network; the AAL5 PDU's CRC will be invalid. #5. There is a EOF (end of frame) bit within the Cell header; which tells the destination when it has recieved the last cell comprising the AAL5 PDU. #6. If the EOF cell is lost then the destination will try to recombine 2 (or more) AAL5 PDUs possibly resulting in a PDU that is too large. OR If the only cell comprising a AAL5 PDU made it through the network was the EOF cell then the destination will find that the reassembled AAL5 PDU is smaller than the min allowed This is a Breif overwiew of what ATM does and why you'll see AAL5 errors. There are always ifs and buts and a million little details; BUT I won't get into those PS: if the errored AAL5 frames are not over 1% then don't worry about it. DaveC Q wrote: I'm getting AAL5 CRC and AAL5 Length errors. They are both tied to one another in terms of rate of errors. This is a difficult problem in terms that they are both related. One problem is that the other sidce of the WAN is a Cabletron SSR 8600 hunk oof crap. Someone give me a clue...TIA! marc FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=3711t=3682 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: addressing/mask question [7:3727]
Comments inline: PS: check out ICMP redirect It's another one that'll make your traffic do things that you wouldn't expect. DaveC Scott Meyer wrote: I have a question about network masks and proxy ARP that I have not understood for a long time. I'm not sure that I can clearly explain the question, but I'll give it my best. I got bits and pieces about the situation, so I don't know exactly what is working and when. A co-worker has a customer that has a really messy IP scheme. For simplicity, the network scheme should be network A router A 172.16.1.0 /24172.16.1.1 e0 192.168.1.1 s0 connects over WAN to network B router B 172.16.2.0 /24 172.16.2.1 e0 192.168.1.2 s0 This customer has hosts with misconfigured masks and default gateways all over the place. Some hosts have wrong masks, some wrong gateways, on some both are wrong, and some are right. The routers are configured correctly, as above. Obviously he is experiencing some connectivity issues - sometimes things work, and sometimes they don't. I would like to more completely understand why. Proxy ARP is on (default). Lets assume the following: host A (wrong mask configured, 172.16.1.5 /16, gateway 172.16.1.1) tries to connect to host B 172.16.2.6 (correctly configured as /24, gateway 172.16.2.1) My understanding of what happens: Host A does binary anding, and thinks that host B is on the same subnet. So it ARPs for 172.16.2.1. Proxy ARP is on, so I would think the router recognize that it needs to respond to host A's ARP request. Host A now thinks that host B = MAC address of router A. Host A sends traffic to router A and router A forwards. Both router A and host A know the correct MAC address of each other, so host B's response will get to host A. So this should work consistently despite the misconfiguration, but I know better. How am I thinking incorrectly? # That's correct: When the router sees an ARP for a subnet that it thinks is not local to the interface it will reply with a proxy-arp. From your statement but I know better. How am I thinking incorrectly? I take it that it is not working? I see from your description that the 172.16.x.x is split between a 192.168.x.x. Are you using IGRP, EIGRP, or RIPv2 with no auto-summary OR OSPF Check router A's routing table to see where the 172.16.2.x network is. ## Next question, let's assume the following: host A (wrong gateway configured, 172.16.1.5 /24, gateway 172.16.1.3) tries to connect to host B 172.16.2.6 (correctly configured as /24, gateway 172.16.2.1) My understanding of what happens: Host A does binary anding, and thinks that host B is on another subnet. Host A thinks that the gateway is 172.16.1.3, and ARPs for that. If there is a 172.16.1.3, it will respond with it's MAC, host A will send traffic for host B to 172.16.1.3, which will promptly drop it because it has no idea what to do with it. If there is not a 172.16.1.3, host A will not get a response, and will timeout eventually. I will need to check, but I don't think that host A will ARP for host B (as opposed to ARPing for the gateway). So this should consistently not work. If host A did not have a gateway at all, it would ARP for host B and router A would respond (due to proxy ARP) and connectivity would be established. Am I correct? # Yes: 100% so far... ## I do think it makes a difference who initiates the connection, because of ARP. If host B tries to connect to host A, router A would ARP for host A. Host A would place router A's MAC in it's ARP table for host B, and as long as that entry existed, communication would work consistently? Am I thinking correctly? ## I suppose someone cound program a IP stack that way but I have not seen any host do what you just described. Pretty much Host A will use the same process whether it initiates or is responding. ## If proxy ARP is enabled, why is a default gateway needed? I have never seen a TCP/IP configuration that doesn't have a spot to enter a default gateway. Conversely, if everything has a default gateway, why is proxy ARP needed? If one of those (either the gateway or proxy ARP) is not working for whatever reason, why is communication spotty? Should it not be consistently either working or not? If proxy ARP works like it is supposed to, I don't see a need for hosts to have masks and gateways configured. The only problem I see is if there are multiple gateways available to a subnet, where both (or more) gateways will forward the packet, so the destination gets 2 packets. What happens then is protocol and application dependent. # Question: Why do you need proxy-arp, masks, and gateways... Answer: Control and Flexibility There is always some goofy
Re: Protocol Type 0x886F [7:3737]
886f Microsoft Corporation Redmond, WA found this on IEEE page http://standards.ieee.org/regauth/ethertype/type-pub.html Seem to have something to do with Microsoft load balancing. I have not read it all the way through yet. See http://www.microsoft.com/TechNet/win2000/nlbovw.asp Keep us updated :- DaveC Andy Prima wrote: Dear all, I need help on protocol type 0x886F. It seems that this kind of Ethernet Broadcast is circling around my network and I do not have a clue what it really is. TIA andy FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=3741t=3737 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Serial condition [7:3146]
Please send the configs and IOS ver: I just check a dozen SDLLC and QLLC connections and I can not find any DOWN/UP conditions. If it's the DCE and it sees DTR it goes up/up. If its the DTE and sees DSR DCD it goes up/up. DaveC Hawthorne, Mike MM wrote: Can anyone explain this condition!!! SBCEN5_8TH_FLOOR_PHASE1#sh int s0 Serial0 is down, line protocol is up Hardware is HD64570 Description: MSWAP (RMSPEBD6) MTU 1500 bytes, BW 10 Kbit, DLY 2 usec, rely 255/255, load 1/255 Encapsulation SDLC, loopback not set Router link station role: PRIMARY (DCE) Router link station metrics: slow-poll 10 seconds T1 (reply time out) 3000 milliseconds N1 (max frame size) 12016 bits N2 (retry count) 20 poll-pause-timer 10 milliseconds poll-limit-value 1 k (windowsize) 7 modulo 8 sdlc vmac: 5043.C2AD.A1-- sdlc addr C6 state is DISCONNECT cls_state is CLS_STN_CLOSED VS 0, VR 0, Remote VR 0, Current retransmit count 0 Hold queue: 0/200 IFRAMEs 0/0 TESTs 0/0 XIDs 0/0, DMs 0/0 FRMRs 0/0 RNRs 0/0 SNRMs 15959/0 DISC/RDs 0/0 REJs 0/0 Poll: clear, Poll count: 0, chain: C6/C6 Last input never, output 00:01:36, output hang never Last clearing of show interface counters never Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 15959 packets output, 31918 bytes, 0 underruns 0 output errors, 0 collisions, 59 interface resets 0 output buffer failures, 0 output buffers swapped out 244682856 carrier transitions DCD=up DSR=up DTR=down RTS=down CTS=up Mike Hawthorne Johanesburg South Africa __ Disclaimer and confidentiality note Everything in this e-mail and any attachments relating to the official business of Standard Bank Investment Corporation (Stanbic) is proprietary to the company. It is confidential, legally privileged and protected by law.\ Stanbic does not own and endorse any other content. Views and opinions are those of the sender unless clearly stated as being that of Stanbic. The person addressed in the e-mail is the sole authorised recipient. Please notify the sender immediately if it has unintentionally reached you and do not read, disclose or use the content in any way. Stanbic can not assure that the integrity of this communication has been maintained nor that it is free of errors, virus, interception or interference. __ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=3329t=3146 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: MCSE [7:3181]
Is this a sneak peak at IOS 13.x ??? :- DaveC RANMA wrote: Sgd zmrvdq, ne bntqrd, hr sgzs hs cndrm's. Sn rdd sghr, hlzfhmd rszmchmf hm eqnms ne z lhqqnq gnkchmf zm zqqnv onhmshmf sn xntq qhfgs. Sgdm sgd hlzfd ne sgd zqqnv hm sgd lhqqnq vhkk zkrn onhms sn xntq qhfgs. Sgd jdx sn sgd oqnakdl gdqd hr sn zrj sgd qhfgs ptdrshnm, vghbg hr: Vgzs cndr z lhqqnq qdudqrd? Sgd zmrvdq sn sghr ptdrshnm hr fhudm hm sgd mdws ozqzfqzog, vghbg hr vqhssdm hm sgd hmudqrd bncd, vgdqd dzbg kdssdq rszmcr enq sgd oqdbdchmf kdssdq hm sgd zkogzads. B njssps sfwfstft sjhiu- boe mfgu-iboefeoftt. Ju epft uijt bt gpmmpxt: B njssps mfbwft sjhiu bmpof, boe vq bmpof, cvu sfwfstft gspou boe cbdl. (Jq zpv ipme bo bsspx qpjoujoh upxbse uif njssps, jut jnbhf qpjout cbdl pvu pg uif njssps upxbset zpv.) Uijt ibt uif fggfdu pg sfwfstjoh psjfoubujpo. Tjodf uif uxp psjfoubujpot pg uisff-tqbdf bsf hjwfo cz uif sjhiu iboe svmf boe mfgu iboe svmf, xifo ju sfwfstft psjfoubujpo ju sfwfstft sjhiu boe mfgu iboet. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=3189t=3181 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: FastEthernet is up, Line protocol down [7:1828]
Sorry if it sounded like I was guessing.. :-} Played with issue again last night. Every time that I have seen UP/Down the cable was detached etc. We install/move/remove a lot of equipment and it is always up/down... The line protocol is dependent on the keepalives. Just try a no keep on the interface and UP/UP it will go. Ran tests on: 2500 AUI 2600 10M RJ45 (half full duplex) 3600 10M RJ45 (half full duplex) 4500 100M RJ45 MII(half full duplex) 7200 10M RJ45 (half full duplex) 7200 100M RJ45 (half full duplex) 7200 100M MII (Believe I did this too but can not remember) unfortunately the 7500s with Gig FE MMF ports are being used for spare parts @tt. In all cases if keepalives are disabled, the line protocol is up. If not up/down. Sniffer shows the keepalive frames as having the same source and destination mac address. Ethernet type 9000 LOOP frame. I would like to attach the interfaces to the switch, and filter keepalives out. Maybe [set port protocol slot/mod group off]. I doubt if that will work, but will try and find out. PS: it is a nice document so is the digital research paper. DaveC Priscilla Oppenheimer wrote: I'm looking for a real answer from experience, not documentation. That page you sent me was something I helped write ;-) Priscilla At 06:53 PM 4/26/01, David Chandler wrote: Found some info: Interface is UP: means the routers ethernet hardware has been activated. Line Protocol Down: The router never sees any of the keepalives that it sends out. YES: you'll get the same thing with RJ45... http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1904.htm Search for: show interfaces ethernet Field Descriptions it'll explain in a little more detail. DaveC Priscilla Oppenheimer wrote: I tried to do some more research on this and couldn't get a good answer. Does anyone know exactly in which cases the router reports the interface up, down even if there is no cable attached? Looking at show interface ethernet, Router reports up, down with no cable for AUI. How about RJ45? How about MII? GMII? Others? Thanks Priscilla Priscilla At 08:21 PM 4/25/01, md. nazri wrote: thanks for the answer... i understand that LP will down if no connection attach, but why FE still up, does it up forever until we shut it down? Does it apply the same to Ethernet..? - Original Message - From: Vincent Chong To: Sent: Wednesday, April 25, 2001 3:48 PM Subject: Re: FastEthernet is up, Line protocol down [7:1828] 1) I guess you enable the fastethernet port in the running configuration. You have to shutdown the port, so the port will administrative shut down and line protocol down. 2)Line protocol will up if there is any phyiscal connection attached to Fastethernet. Becasue the port in your router will detect keepalive signal, when it detected, it will up.You can type no keepalive under interface configuration, the ethernet interface will keep up even no physical connection. You have to enable the interface, of courese. Hope this help Vincent Chong md. nazri hi all, got one question regarding FastEthernet on Cisco 2620.. why the status showed FastEthernet is up, Line protocol down although the cable was pulled out from the port...in what cases the port will down..any help appreciated tq FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http
Re: What is FDDI 4B/5B? [7:2018]
It's 25% in the other direction (125mbps). But I'm thinking you already knew that? DaveC Tom Lisa wrote: So, does this mean it should really be called 80BaseTX/FX because of the 20% overhead introduced by 4B/5B? :) Prof. Tom Lisa, CCAI Community College of Southern Nevada Cisco Regional Networking Academy Priscilla Oppenheimer wrote: 4B/5B is a signal encoding scheme. It's used in 100BaseTX and 100BaseFX also, so it's rather important to know. I'm going to have all the gory details in an upcoming white paper at http://www.certificationzone.com. Here's quick preview. 100BaseFX uses Non Return to Zero, Invert on One (NRZI), as does FDDI. 100BaseTX uses a variation of NRZI called either NRZI-3 or Multiple Level Transition - 3 (MLT-3). A disadvantage of NRZI and MLT-3 is that a steady stream of zeros, not uncommon in data, is represented as no transition, which is indistinguishable from no signal or a dead link. Another problem with no transitions is that the phase-locked loop that the receiving station uses to recover the clock signal can drift. If enough drift is introduced, the station cannot accurately receive data. To avoid this problem, the physical coding sublayer (PCS) first encodes data using 4B/5B translation. With 4B/5B translation, each possible 4-bit pattern is assigned a 5-bit code. The PCS maps four-bit nibbles in the data into five-bit codes, and vice versa, using a 4B/5B translation table. Every 5-bit code has at least two transitions to ensure proper clocking. Isn't that fascinating! Just kidding! ;-) Priscilla At 09:51 PM 4/25/01, William Wong wrote: Dear all I couldn't find any information on this. Can you guys tell me what is this? Thanks. William FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2316t=2018 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ATM interface troubleshooting question. [7:2249]
Both but mainly a cell level issue: If you lose a cell, it will screw-up the AAL5 frame. Thus causing the frame and/or CRC errors seen in sh int. You are really moving some traffic. Is this PVC traffic going across any links that may be congested? A DS3 perhaps? Need to find where the cells are getting dropped if you can. My $.02 DaveC [EMAIL PROTECTED] (Katson Yeung) wrote: Dear all, My old 7507 is having a minor problem it is 12.0.16GD, RSP2 with 64M ram and the ATM card is an AIP. I have only one VC associate with this ATM port. I found quite a number of input errors (CRC and Frames)... how can I know the source of that problem?? Is it the cell level, or the frame level problem? See below show interface output: ATM0/0 is up, line protocol is up Hardware is cxBus ATM MTU 4470 bytes, sub MTU 4470, BW 155520 Kbit, DLY 80 usec, rely 255/255, load 8/255 Encapsulation ATM, loopback not set, keepalive not supported Encapsulation(s): AAL5, PVC mode 256 TX buffers, 256 RX buffers, 2048 maximum active VCs, 1024 VCs per VP, 1 current VCCs VC idle disconnect time: 300 seconds Last input 00:00:00, output 00:00:00, output hang never Last clearing of show interface counters 3d10h Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 1/75, 40 drops 5 minute input rate 34782000 bits/sec, 4564 packets/sec 5 minute output rate 5307000 bits/sec, 3372 packets/sec 1174284787 packets input, 1013959162 bytes, 0 no buffer Received 0 broadcasts, 0 runts, 0 giants, 11 throttles 13076769 input errors, 13054514 CRC, 22255 frame, 0 overrun, 0 ignored, 0 abort 893230791 packets output, 346650156 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 output buffer failures, 0 output buffers swapped out FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2319t=2249 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: What is PRI exactly? [7:2055]
At a lower level a PRI is a channelized T1 with ESF framing and B8ZF encoding. This gives you 24 x 64kbps channels. Channels 1 to 23 are B channels which are used to carry data, or digitized voice. What is carried and how many B Channels are used in a call is controlled by the D Channel. The 24th channel is known as the D channel. It is used to communicate ISDN signalling (Q.931) between the ISDN switch and the ISDN endstation. The signalling does things like call-setup, call-release, signals optional parameters like BONDING (muxing) modes, caller ID info, etc. Note: Cisco numbers the channels 0 to 23; so channel 23 is the D channel. The D Channel is used to negotiate call parameters. Type of data, Bonding mode (muxing), number of B channels being used for the call, who is calling (for caller-id) etc. The call parameter negotiations must first be completed before the B channels are asigned to be used. To answer your question is it just ISDN with a bigger pipe: YES Does it create/accept and assign B channels dynamically: YES Can individual B channels be used for different calls and/or differnet types of data: YES Does PRIs and BRIs use the same signaling (Q.931): YES Do the PRIs dial: YES (they have ISDN phone numbers just like BRIs) Basically you can use PRIs for higher speed connections (greater than 128Kbps), and they are reall handy when you are setting up a dial-in platform. One circuit/cable and you can handle up to 23 calls... Hope it helps DaveC Chris Wornell wrote: Hello, For some reason, PRI has racked my brain ever since I learned about it. From what I understand, its basically a line with 23 64kb B channels and 1 64kb D channel. The thing I'm confused about is I always see it mentioned with ISDN. Is it really just an ISDN line with a bigger pipe? Is there any sort of dialing required when using it? Does it use the same protocols as ISDN? Can you use each channel for either voice or data dynamically like BRI? Any information would be helpful. Thank you, Chris Wornell CCNA, CCDA FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2101t=2055 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: FastEthernet is up, Line protocol down [7:1828]
hey! somebody gets it! Thanks Priscilla: It always bothers me that full-duplex is refereed to as 200 meg. The server folks always think that all their performance issues will go away when they go to full-duplex. Sure, no collision, but considering the unbalanced nature of client/server traffic it doesn't make that big of a throughput difference. I'm surprised that my T1's are not referred to as 3 mbps links. They are full-duplex too :- DaveC Oppenheimer wrote: At 12:23 AM 4/26/01, md. nazri wrote: if it's true..that's a good indicator for hardware health checkup. another Q, if we set the FE to be full-duplex, does it mean we get 100meg for tx and 100meg for rx, so total 200meg for a connection...? Each of the two stations on a point-to-point FE full-duplex link get dedicated 100 Mbps bandwidth for transmitting. One station's transmit medium is the other's receive medium. Some people call this 200 Mbps. In actuality most traffic types don't take advantage of this. - Original Message - From: Priscilla Oppenheimer To: Sent: Thursday, April 26, 2001 9:07 AM Subject: Re: FastEthernet is up, Line protocol down [7:1828] I don't think it's just Fast Ethernet. I've seen Slow Ethernet report that the interface is up, down when nothing was attached. It seems to just be an indication that the interface passed a hardware check. Priscilla At 08:21 PM 4/25/01, md. nazri wrote: thanks for the answer... i understand that LP will down if no connection attach, but why FE still up, does it up forever until we shut it down? Does it apply the same to Ethernet..? - Original Message - From: Vincent Chong To: Sent: Wednesday, April 25, 2001 3:48 PM Subject: Re: FastEthernet is up, Line protocol down [7:1828] 1) I guess you enable the fastethernet port in the running configuration. You have to shutdown the port, so the port will administrative shut down and line protocol down. 2)Line protocol will up if there is any phyiscal connection attached to Fastethernet. Becasue the port in your router will detect keepalive signal, when it detected, it will up.You can type no keepalive under interface configuration, the ethernet interface will keep up even no physical connection. You have to enable the interface, of courese. Hope this help Vincent Chong md. nazri hi all, got one question regarding FastEthernet on Cisco 2620.. why the status showed FastEthernet is up, Line protocol down although the cable was pulled out from the port...in what cases the port will down..any help appreciated tq FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2161t=1828 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Utilization/load Calculations [7:2167]
Hi all: How is the Load calculated on a serial interface, or any interface for that matter? Does it: 1. Use some weird formula like the 5 minute moving average? Who dreamed that thing up? 2. Use the greater of the input or output bps? 3. Add the current (input + output) bps together and ratio it against the max possible (input + output) bps? 4. none of the above. this is what I'm betting on.. We often use ciscoview to monitor circuits for error, dropped packets, input/output bps etc. (It is a lot better than having to keep refreshing your telnet sh int..sh int...sh int..) The utilization which comes from the load never really seems to make any sense. For example: if the Tx is maxed out the utilization does not indicate it... I gave up looking at load/utilization a long time ago. Unfortunately my coworkers seem to think that unless the utilization (via Ciscoview) is high that the slow response issues have to be caused by something else. Needless to say; when the circuit is upgraded and the slow response issues clear, there is a lot of political knife sharpening... TIA DaveC PS: I did check archives. After 100+ messages not telling me what I wanted to know; decided this was a group Question. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2167t=2167 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Utilization/load Calculations [7:2167]
What bothers me is that using a comprehensive calculation (input and output combined) on ANY full-duplex connection seams meaningless. What difference does it make if there is still bandwidth to spare on the Rx side when the Tx is maxed out? Your thoughts?? DaveC Yes: when I say 5 minute movin average, I mean the exponential average. I have the formula around here some where. EA Louie wrote: the definition of load from Cisco: Load on the interface as a fraction of 255 (255/255 is completely saturated), calculated as an exponential average over five minutes. I don't personally have access to the formula, nor could I find it on Cisco's website. If this were a multiple choice problem on the certification exams, I'd rule out answer 2, because neither input or output is comprehensive in and of itself If 'moving average' means exponential average, then I'd choose answer 1 in conjunction with answer 3. The utilization (based on the sh int load value) doesn't make any sense *unless* the bandwidth parameter on the interface is set to reflect the actual bandwidth of the circuit. We had a tool once that extracted both the input/output bps averages and the drops, and calculated *them* across a few seconds against the circuit bandwidth - it gave us a little better granularity and accuracy, especially if the drops corresponded with higher 'load'. Also, my experience has been that as the sustained (not burst) pps/bps interface utilization approaches the CIR bandwidth of a frame relay circuit, the performance of the PVC starts to degrade. Lots of buffered packets will tend to do the same, so bursts on a point-to-point serial link cause the same problem. - Original Message - From: David Chandler To: Sent: Thursday, April 26, 2001 1:05 PM Subject: Utilization/load Calculations [7:2167] Hi all: How is the Load calculated on a serial interface, or any interface for that matter? Does it: 1. Use some weird formula like the 5 minute moving average? dreamed that thing up? 2. Use the greater of the input or output bps? 3. Add the current (input + output) bps together and ratio it against the max possible (input + output) bps? 4. none of the above. We often use ciscoview to monitor circuits for error, dropped packets, input/output bps etc. (It is a lot better than having to keep refreshing your telnet sh int..sh int...sh int..) The utilization which comes from the load never really seems to make any sense. For example: if the Tx is maxed out the utilization does not indicate it... I gave up looking at load/utilization a long time ago. Unfortunately my coworkers seem to think that unless the utilization (via Ciscoview) is high that the slow response issues have to be caused by something else. Needless to say; when the circuit is upgraded and the slow response issues clear, there is a lot of political knife sharpening... TIA DaveC PS: I did check archives. After 100+ messages not telling me what I wanted to know; decided this was a group Question. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2185t=2167 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: FastEthernet is up, Line protocol down [7:1828]
Found some info: Interface is UP: means the routers ethernet hardware has been activated. Line Protocol Down: The router never sees any of the keepalives that it sends out. YES: you'll get the same thing with RJ45... http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1904.htm Search for: show interfaces ethernet Field Descriptions it'll explain in a little more detail. DaveC Priscilla Oppenheimer wrote: I tried to do some more research on this and couldn't get a good answer. Does anyone know exactly in which cases the router reports the interface up, down even if there is no cable attached? Looking at show interface ethernet, Router reports up, down with no cable for AUI. How about RJ45? How about MII? GMII? Others? Thanks Priscilla Priscilla At 08:21 PM 4/25/01, md. nazri wrote: thanks for the answer... i understand that LP will down if no connection attach, but why FE still up, does it up forever until we shut it down? Does it apply the same to Ethernet..? - Original Message - From: Vincent Chong To: Sent: Wednesday, April 25, 2001 3:48 PM Subject: Re: FastEthernet is up, Line protocol down [7:1828] 1) I guess you enable the fastethernet port in the running configuration. You have to shutdown the port, so the port will administrative shut down and line protocol down. 2)Line protocol will up if there is any phyiscal connection attached to Fastethernet. Becasue the port in your router will detect keepalive signal, when it detected, it will up.You can type no keepalive under interface configuration, the ethernet interface will keep up even no physical connection. You have to enable the interface, of courese. Hope this help Vincent Chong md. nazri hi all, got one question regarding FastEthernet on Cisco 2620.. why the status showed FastEthernet is up, Line protocol down although the cable was pulled out from the port...in what cases the port will down..any help appreciated tq FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=2189t=1828 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: DDR into a PRI [7:1701]
Yes; you have to use MICAs. The MICAs (modems) are the only thing that will be able to interpret the modulated then digitized signal coming from the remote locations. The remote modems create an analog signal which only another modem of same protocol could read (V.whatever). The Remote analog signal gets digitized at the nearest CO, using PCM. The Pulse Code Modulated verision of the analog signal is sent all the way thru the PRI and your central site router redirects it ISDN INCOMING-VOICE MODEM to the MICA modems. The MICA modems look at the PCM data and interpret it as though it had arived as a analog signal. Question to ALL: ## Does any body know if the MICAs actually convert the PCM data back into analog. Then read the V.whatever. or Does the MICA do both at the same time. The first approach would be cheaper from a circuitry stand point; but it seems kinda crazy to convert the digital signal into an analag signal for approx 1 cm. ### DaveC Robert Fowler wrote: Ok here is my question, Say you setup DDR with analog lines back to a central location with PRI, would you need to have the MICA modems or is there a command that will let the PRI interface card use the lines from the t1-PRI? I've search the CCO and I've found a lot of information on DDR but nothing on the specifics for coming back into a central PRI. Lost in DDR land FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=1728t=1701 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: EIGRP in IOS version 11 [7:1750]
See the subnet optional switch for OSPF redistributions: router ospf 100 redistribute EIGRP 123 SUBNETS etc..etc... I can not remember what happens when you leave the subnet off the redistribute command. I do remember that it was not what I wanted to happen.. :+} DaveC Roe Brian M Civ 612 ACOMS/AFETS wrote: Tuesday, April 24, 2001 To all: Has anyone ever heard of a problem with redistributing EIGRP routes to OSPF, specifically the subnets not getting distributed, I had heard that there may be an IOS issue which has been resolved by ver. 12 ? We have had to use static routes in the ISP's router for authorized users to reach our internal networks. Brian Roe (GS-11) TDC ICAP Deployable Systems/Tactical Networks 12 AF AFETS 5280 E Gafford Way (Bldg.72) Suite 111 Davis-Monthan AFB, AZ 85707 FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=1757t=1750 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Questions about EIGRP Topology table [7:1581]
This is where actual hands-on pays off. From a lot of docs you'll get the impression that the topology table only stores the main route sucessor and feasible sucessors. Obviously from your output that is not the case. You have 3 EIGRP neigbors that have a route for the 172.20.178.0/24 network. The 172.20.100.1 is the next hop for the route that is in the routing table. The Feasible Distance is 675072. The other two neigbors have metrics to the network of 2330112 1789952. This router has NO Feasible Successor because the other two neigbors have metrics greater than the FD. If the 172.20.100.1 router is lost the route will go ACTIVE, and query all neighbors to see if they have metric that beats the FD of 675072. Since the other two neighbors routes are higher than the FD than this router will not accept them as the sucessor until the current route, next hop, FD, etc is flushed out of the routing table. You state: [Actually, there should be 5 routing path can reach the network 172.20.178.0] With out knowing a lot more about the physical logical topologies, and seeing all configs I can not give a guess as to why you do not have 5 neigbors with a route to 172.20.178.0/24. DaveC dovelet wrote: Hi all, I have a question about EIGRP Topology table. As I know, if there is many path can go to a network, the EIGRP topology table will only stores the route of the Successor and the Feasible Successor. The path will become Feasible Successor if its Reported Distance is less than the Feasible Distance. However, I found the following in my network: R1#show ip eigrp topology 172.20.178.0 255.255.255.0 IP-EIGRP topology entry for 172.20.178.0 255.255.255.0 State is Passive, Query origin flag is 1, 1 Successor(s), FD is 675072 Routing Descriptor Blocks: 172.20.100.1 (Ethernet1), from 172.20.100.1, Send flag is 0x0 Composite metric is (675072/649472), Route is Internal Vector metric: Minimum bandwidth is 6146 Kbit Total delay is 10100 microseconds Reliability is 255/255 Load is 24/255 Minimum MTU is 1500 Hop count is 2 172.20.31.2 (Serial2), from 172.20.31.2, Send flag is 0x0 Composite metric is (3258880/2330112), Route is Internal Vector metric: Minimum bandwidth is 1536 Kbit Total delay is 62200 microseconds Reliability is 255/255 Load is 7/255 Minimum MTU is 1500 Hop count is 6 172.20.32.2 (Serial5), from 172.20.32.2, Send flag is 0x0 Composite metric is (2462720/1789952), Route is Internal Vector metric: Minimum bandwidth is 1536 Kbit Total delay is 31100 microseconds Reliability is 255/255 Load is 44/255 Minimum MTU is 1500 Hop count is 3 - When I show the EIGRP topology table in R1, it show 3 routes (I think 1 is the Successor and 2 are the Feasible Successor). Actually, there should be 5 routing path can reach the network 172.20.178.0, it only display 3 of them, I think it is due to the other 2 have greater Reported Distance and they cannot become the Feasible Successor. Is that true? My another question is: when R1 go to network 172.20.178.0, it chooses the router 172.20.100.1 and the Feasible Distance is 675072. The Reported Distance of the path through the router 172.20.31.2 and 172.20.32.2 are 2330112 and 1789952 which are much greater than the Feasible Distance. They should not be stored in the topology table. How come they will displayed in the table? Please help. Regards. dovelet FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=1658t=1581 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Cisco 26xx 36xx CONs AUXs are Different [7:1500]
After spending 3 hours searching CCO finding countless DOCs that state Aux max speed is 38400 which contridicts Bernardo's FUNCTIONING Reverse Telnet... I have found verification about the AUX ports on the 26xx and 36xx's. John is correct they are differnet than the AUX ports on other Cisco routers. (see cco page below) This pages which should help a lot of people with async issues. Gives great details about platform specific differences in the async, aux, and con ports of cisco products. Also cover gottas and troubleshooting... http://www.cisco.com/warp/customer/76/9.html#reverse_telnet DaveC John Neiberger wrote: The aux port on the 2600 (and I'm assuming the 3600) can do 115kbps. John "David Chandler" 4/20/01 2:36:01 PM How did you get this to work on the AUX port? I agree with everything bellow except with the "speed 115200". Acording to my documentation "Cisco IOS Dial Solutions" the max speed on the AUX port is 38400. I have set this up on 2500s, 4500s 7500s. Every time that I have tried to force the speed greater than 38400, the line speed will cycle through all the speeds 9600, 14400 etc and not sync with the modem. Is the AUX differnet for 2600's ? If you repeatedly do a "sh line" what speed does the AUX show up at? And, is it changing? PS: I have been checking CCO for the specifics on the 2600 AUX to confirm but no luck @tt DaveC Bernardo Estevez wrote: Hey listen man. Thank you so much. The configuration below WORKED!!! I appreciate your help. Thanks again, -Bernardo --- Thomas wrote: Try this configuration: line aux 0 login local modem InOut modem autoconfigure type usr_courier transport input all escape-character BREAK autoselect ppp stopbits 1 speed 115200 flowcontrol hardware I tried the "modem autoconfiguration discoverty" with the U.S. Robotics, but it didn't work. Also, the "modem" adapter shipped with the 2600 router is not the correct one. I don't have the part number here. Please go to Cisco web site and check for part number of this adapter. ""Bernardo Estevez"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi all, I'm trying to configure the AUX port on a Cisco terminal server 2621. I'm using an external US Robotics 56K modem connected with a rolled cable and a modem adapter on the modem side. This connection seems to work but where I'm having problem is in the configuration of the "line aux 0" interface. This is what I have done so far: line aux 0 autobaud modem answer-timeout 20 modem autoconfigure discovery stopbits 1 When I dial-in using Windows2k HyperTerminal, the modem answers and I get connected, but then I don't see anything on the window. I've tried playing around with the 'login' and 'password' option but no luck. Do I have to manually tell it the transmit and receive speeds? What else am I missing? Any input would be greately appreciated. Thank you in advance. Please also copy your reply to [EMAIL PROTECTED] as I don't get the chance to go through this list too often. -Bernardo __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=1500t=1500 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Cisco 2621 Aux port [7:1304]
How did you get this to work on the AUX port? I agree with everything bellow except with the "speed 115200". Acording to my documentation "Cisco IOS Dial Solutions" the max speed on the AUX port is 38400. I have set this up on 2500s, 4500s 7500s. Every time that I have tried to force the speed greater than 38400, the line speed will cycle through all the speeds 9600, 14400 etc and not sync with the modem. Is the AUX differnet for 2600's ? If you repeatedly do a "sh line" what speed does the AUX show up at? And, is it changing? PS: I have been checking CCO for the specifics on the 2600 AUX to confirm but no luck @tt DaveC Bernardo Estevez wrote: Hey listen man. Thank you so much. The configuration below WORKED!!! I appreciate your help. Thanks again, -Bernardo --- Thomas wrote: Try this configuration: line aux 0 login local modem InOut modem autoconfigure type usr_courier transport input all escape-character BREAK autoselect ppp stopbits 1 speed 115200 flowcontrol hardware I tried the "modem autoconfiguration discoverty" with the U.S. Robotics, but it didn't work. Also, the "modem" adapter shipped with the 2600 router is not the correct one. I don't have the part number here. Please go to Cisco web site and check for part number of this adapter. ""Bernardo Estevez"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi all, I'm trying to configure the AUX port on a Cisco terminal server 2621. I'm using an external US Robotics 56K modem connected with a rolled cable and a modem adapter on the modem side. This connection seems to work but where I'm having problem is in the configuration of the "line aux 0" interface. This is what I have done so far: line aux 0 autobaud modem answer-timeout 20 modem autoconfigure discovery stopbits 1 When I dial-in using Windows2k HyperTerminal, the modem answers and I get connected, but then I don't see anything on the window. I've tried playing around with the 'login' and 'password' option but no luck. Do I have to manually tell it the transmit and receive speeds? What else am I missing? Any input would be greately appreciated. Thank you in advance. Please also copy your reply to [EMAIL PROTECTED] as I don't get the chance to go through this list too often. -Bernardo __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=1417t=1304 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: HSRP [7:903]
Sounds like you are implementing too many thing at once. 1. Before you implement HSRP on the interface you should verify simple connectivity. Get rid of the everything on the RTR-B interface and see if it is up up. If not than you should look for a simpler problem than HSRP not working correctly. 2. Since it is up down (ethernet) my guess is that you have a physical layer issue. Possibly a cable issue, or the other end of the fa int is plugged into a 10 Mb hub/switch? PS: when you do get it into up/up; since RTR-B's priority is 150 won't it be the active interface? (assuming that STANDBY PREEMPT is used) Let us know what you find DaveC SH Wesson wrote: There are two routers: Rtr-A and Rtr-B. HSRP is running between these two groups with RTR-A set with a priority of 100 and RTR-B set with a priority of 150. Currently, RTR-A is the active router. However RTR-B shows that it's in a state of INIT. When I do a "show int fa0/0", it shows that the line is up but the protocol is down. The configuration looks fine and HSRP is tracking the serial interface. Any suggestion as to why RTR-B is not in standby state and how to resolve the problem to get it out of INIT state. If RTR-A goes down now, RTR-B will not pick up and become active as it stands now. Any assistance would be appreciated. Thanks. _ Get your FREE download of MSN Explorer at http://explorer.msn.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=908t=903 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Test is in 2 hours and I'm having difficulties with RIF [7: [7:970]
Why can't the 3 be correct? The only 3 in the rif is part of a RD (route designator field) the 0810 is the RC (route control field). RC= Type 3 bits = 000 (directed explorer non-broadcast) Length 5 bits = 01000 = 8 bytes = # of bytes of the rif RC + RD; in this example 1 RC + 3 RDs (2 bytes each) Direction 1 bit = 0 = left to right Largest 3 bit = 001 = 1500 bytes DaveC John Neiberger wrote: That is a great link! Thanks for posting it, that's going to be very helpful. "Sean C." 4/17/01 12:59:51 PM Hi Mike, Have been following your statements on various RIF docuements. Your second RIF: 0810 00A1 00B2 00C3 cannot be valid because it ends in a 3 - and I assume you know that it's supposed to end in a 0 so I'll take the guess that this is just a typo. I referenced your two links and I think the Cisco link is incorrect. I could not find where in the CCPrep document it states that an 8 equals a 3 bridge/ring combo. On page 5 of the CCPrep paper (almost at the bottom) it states "A value of '8' means that there are two bridges" which would be consistent with the rest of that RIF. Have you tried this link: http://www.loopy.org/rif.cgi Good luck, Sean C. CCNP, CCDP, MCSE FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=970t=970 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: subnets [7:638]
No problem: #1. The addresses listed do not overlap (all different class Bs), and EIGRP handles VLSM. **see #2** #2. EIGRP by default auto-summarizes at classful boundries, so either use NO IP AUTO-SUMMARY, or make sure you don't create multiple clouds of 172.20.xxx.xxx/24 networks. DaveC SH Wesson wrote: Our existing network consists of a flat network at 172.16.0.0 with a mask of 255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat, the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is running. Now, the question I have is, if I create new subnets to segment the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all with masks of 255.255.255.0 and if I run EIGRP also. If I were to run both the above networks at once and within the same EIGRP process, would it cause any problems. Thanks. _ Get your FREE download of MSN Explorer at http://explorer.msn.com FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=654t=638 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: subnets [7:638]
No problem:
#1. The addresses listed do not overlap (all different class Bs), and EIGRP
handles
VLSM. **see #2**
#2. EIGRP by default auto-summarizes at classful boundries, so either use:
(config-router)#NO AUTO-SUMMARY {on all eigrp routers.}
Or make just make sure you don't create multiple clouds of 172.20.xxx.xxx/24
networks.
DaveC
SH Wesson wrote:
Our existing network consists of a flat network at 172.16.0.0 with a mask
of
255.255.0.0 and 172.31.0.0 with a mask of 255.255.0.0. Since it is flat,
the networks are 172.16.2.0 - 172.16.12.0 mask 255.255.0.0. EIGRP is
running. Now, the question I have is, if I create new subnets to segment
the place with networks like 172.20.10.0, 172.20.11.0, 172.12.0, etc all
with masks of 255.255.255.0 and if I run EIGRP also. If I were to run both
the above networks at once and within the same EIGRP process, would it
cause
any problems. Thanks.
_
Get your FREE download of MSN Explorer at http://explorer.msn.com
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7i=689t=638
--
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: designing subnets with all ones/zeros.. [7:695]
Chuck Thanks for the proof read : Bellow is the cisco page part of the doc relating to zero subnets. To me it reads "don't; because we say so" http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c/ipcprt1/1cdipadr.htm#xtocid105602 --- Enabling Use of Subnet Zero Subnetting with a subnet address of zero is illegal and strongly discouraged (as stated in RFC 791) because of the confusion that can arise between a network and a subnet that have the same addresses. For example, if network 131.108.0.0 is subnetted as 255.255.255.0, subnet zero would be written as 131.108.0.0which is identical to the network address. You can use the all zeros and all ones subnet (131.108.255.0), even though it is discouraged. Configuring interfaces for the all ones subnet is explicitly allowed. However, if you need the entire subnet space for your IP address, use the following command in global configuration mode to enable subnet zero: --- You mentioned that Windows is not rfc1812 compiant and that it allows wacky subnets and disallows some valid subnets. Was that trial error or has microsoft documented this? I hate spending an hour looking for a document that is not there... Thanks DaveC Chuck Larrieu wrote: Comments within: -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of David Chandler Sent: Saturday, April 14, 2001 11:25 PM To: [EMAIL PROTECTED] Subject:designing subnets with all ones/zeros.. [7:695] I have two questions regarding using the all ones and/or the all zeros subnet. Recently one of my co-workers started studying for CCNA and while reviewing subnets he kept telling me that you could not use the all zero or all ones subnet. CL: classically speaking this is true. Early implementations, etc. these days this is no longer the case The Win95, NT, and LINUX hosts didn't have a problem with it nor did the routers. CL: a long time ago on this list we had a discussion of wacky subnet masks. In the course of researching this, I found that the windows IP stack was not rfc 1812 compliant in that it allowed discontiguous / wacky / non contiguous ones subnet masks, and that windows also categorically denied use of certain legitimate ip addresses. Such as 172.16.1.255/16 I believe that this is corrected in Win2K I tested it with RIP EIGRP. (skipped OSPF since it is classful). CL: I believe you meant to say "classless" ;- I found that Cisco and others vendors agree that it will work, but they "Strongly discourage using the all ones or all zeros subnets" CL: where did you find language about "strongly discourage"? PS: if some of you try testing this; note that prior to 12.1 you'll need to enter (config)# ip zero-subnet before the router will accept a zero subnet on a interface. Starting in 12.1 the zero subnet is enabled by default. CL: ip subnet-zero Question #1: What type problems could you run into by using a all ones/zero subnet. CL: issues with older equipment / obsolete equipment / old OS versions Question #2: For you folks that are in design; Do you follow or ignore the "DO NOT USE ALL ONES/ZEROS" rule? CL: use both all the time. Of course I sell new Cisco equipment, so there is no issue with most customers. Or I sell EIGRP or OSPF designs. Same thing. ;- I'm trying to get a real world idea of what the standard practice is. I work at a large corp, so I haven't a clue what sane people do. CL: so do I and neither do I. DaveC FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=724t=695 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: designing subnets with all ones/zeros.. [7:695]
So are we all agreed that there is not a problem with using the all 1s/0s subnet? The real problem seem to be that they continue to teach it. I think I can plow through RFCs 791, 950 1812 within the next couple days. May be there is a more compelling reason than it could cause problems with hosts built in the mid eighties. Chuck stated: "Wonder if that's part of the reason I didn't make it to day 2 ;-" That brings up the real question. What does cisco believe is the correct way? It appears that passing the CCIE lab is as much about guessing the "correct" way to implement something; as it is raw technical knowledge? Thanks for your input: DaveC "Howard C. Berkowitz" wrote: That Cisco page is extremely dated information, and actually not quite right -- RFC 791 is, indeed, the primary IPv4 specification, although the IP address format was originally defined in RFC 760. Neither one of these, however, discusses subnetting, which was introduced later in RFC 950. RFC 760 simply assumed a fixed 8-bit network and 24-bit host field, while RFC 791 introduced classes A/B/C. Wonder if that's part of the reason I didn't make it to day 2 ;- I see the point of the article, but I still believe it is more of a compatibility issue than anything else. Can't get into the RFC server I normally use to see if RFC 1812 ventures an opinion. CIDR probably figures in here somewhere. CIDR actually is in a set of RFCs, about 1518-1520. Without having it in front of me, 1812 specifically says the all zeroes and all ones subnets are legal, but they can be ambiguous in a classful environment. Their use is quite routine in a classless environment, such as an ISP--I frequently use them in addressing plans and have no problems with modern routing. It's been quite a while since I worked in anything with classful addressing. I know that throughout my practice for the lab that I have had situations exactly as described in the link you provide. I don't recall problems, but then the lab is not reality ;- Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of David Chandler Sent: Sunday, April 15, 2001 12:42 PM To:[EMAIL PROTECTED] Subject: Re: designing subnets with all ones/zeros.. [7:695] Chuck Thanks for the proof read : Bellow is the cisco page part of the doc relating to zero subnets. To me it reads "don't; because we say so" http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_c /ipcprt1/1cdipadr.htm#xtocid105602 --- Enabling Use of Subnet Zero Subnetting with a subnet address of zero is illegal and strongly discouraged (as stated in RFC 791) because of the confusion that can arise between a network and a subnet that have the same addresses. For example, if network 131.108.0.0 is subnetted as 255.255.255.0, subnet zero would be written as 131.108.0.0which is identical to the network address. You can use the all zeros and all ones subnet (131.108.255.0), even though it is discouraged. Configuring interfaces for the all ones subnet is explicitly allowed. However, if you need the entire subnet space for your IP address, use the following command in global configuration mode to enable subnet zero: --- You mentioned that Windows is not rfc1812 compiant and that it allows wacky subnets and disallows some valid subnets. Was that trial error or has microsoft documented this? I hate spending an hour looking for a document that is not there... Thanks DaveC Chuck Larrieu wrote: Comments within: -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of David Chandler Sent: Saturday, April 14, 2001 11:25 PM To: [EMAIL PROTECTED] Subject:designing subnets with all ones/zeros.. [7:695] I have two questions regarding using the all ones and/or the all zeros subnet. Recently one of my co-workers started studying for CCNA and while reviewing subnets he kept telling me that you could not use the all zero or all ones subnet. CL: classically speaking this is true. Early implementations, etc. these days this is no longer the case The Win95, NT, and LINUX hosts didn't have a problem with it nor did the routers. CL: a long time ago on this list we had a discussion of wacky subnet masks. In the course of researching this, I found that the windows IP stack was not rfc 1812 compliant in that it allowed discontiguous / wacky / non contiguous ones subnet masks, and that windows also categorically denied use of certain legitimate ip addresses. Such as 172.16.1.255/16 I believe that this is corrected in Win2K I tested it with RIP EIGRP. (skipped OSPF since it is classful). CL: I believe you meant to say "classless" ;- I found tha
Re: I need Help!!! Kindly help me(OSPF Virtual links) [7:674]
Looks like you have E0 of dogbert (area 1) in the same ethernet broadcast domain as E3 of aspen (Area 0). The only reason you are not seeing a similar message in dogbert is cause your console logging level is differnet in dogbert DaveC Shahid Muhammad Shafi wrote: Hi Guys. I am configuring a virtual link between two OSPF routers but it is not working at all. I am sending u the configuration and diagram here;. Any help and pinters will be appreciated. Regards Shahid = Shahid Muhammad Shafi MSc Telecommunications Candidate University of Colorado Boulder BSEE(GIKI),MCSE+I,CNA,CCNA,CCNP Please help feed hungry people worldwide http://www.hungersite.com/ A small thing each of us can do to help others less fortunate than ourselves __ Do You Yahoo!? Get email at your own domain with Yahoo! Mail. http://personal.mail.yahoo.com/ Current configuration: ! version 10.2 service tcp-small-servers ! hostname catbert ! enable password lab ! ! interface Ethernet0 ip address 192.168.3.126 255.255.255.224 ! interface Ethernet1 ip address 192.168.3.62 255.255.255.224 ! interface Ethernet2 no ip address shutdown ! interface Ethernet3 ip address 192.168.21.120 255.255.255.0 ! interface Ethernet4 no ip address shutdown ! interface Ethernet5 no ip address shutdown ! interface Ethernet6 no ip address shutdown ! interface Ethernet7 no ip address shutdown ! interface Ethernet8 no ip address shutdown ! interface Ethernet9 ip address 192.168.90.1 255.255.255.0 shutdown ! interface Ethernet10 ip address 192.168.100.1 255.255.255.0 ! interface Ethernet11 ip address 192.168.80.1 255.255.255.0 ! interface Fddi0 no ip address no keepalive shutdown ! interface Hssi0 no ip address shutdown ! router ospf 1 network 192.168.3.32 0.0.0.31 area 2 network 192.168.3.96 0.0.0.31 area 2 ! no logging console ! ! line con 0 exec-timeout 0 0 password lab login line aux 0 password lab login transport input all line vty 0 4 password lab login ! end Current configuration: ! version 10.2 ! hostname breckenridge ! enable password lab ! ! interface Ethernet0 ip address 192.168.3.97 255.255.255.224 ! interface Ethernet1 ip address 192.168.3.94 255.255.255.224 ! router ospf 1 network 192.168.3.96 0.0.0.31 area 2 network 192.168.3.64 0.0.0.31 area 2 ! Current configuration: ! version 11.0 service udp-small-servers service tcp-small-servers ! hostname aspen ! enable password lab ! ! interface Loopback0 ip address 2.2.2.2 255.255.255.0 ! interface Ethernet0 no ip address shutdown ! interface Ethernet1 ip address 192.168.3.33 255.255.255.224 ! interface Ethernet2 --More-- %OSPF-4-ERRRCV: Received invalid packet: mismatch area ID, from backbone area mu st be virtual-link but not found from 192.168.2.254, Ethernet3 shutdown ! interface Ethernet3 ip address 192.168.1.1 255.255.255.0 ! interface Ethernet4 no ip address shutdown ! interface Ethernet5 ip address 192.168.3.65 255.255.255.224 ! interface Ethernet6 no ip address shutdown ! interface Ethernet7 no ip address shutdown ! interface Fddi0 no ip address --More-- router ospf 1 network 192.168.3.32 0.0.0.31 area 2 network 192.168.3.64 0.0.0.31 area 2 network 192.168.1.0 0.0.0.255 area 1 area 2 range 192.168.3.0 255.255.255.0 area 1 virtual-link 1.1.1.1 ! logging console notifications ! ! line con 0 line aux 0 transport input all line vty 0 4 login ! end enable password lab ! ! interface Loopback0 ip address 1.1.1.1 255.255.255.0 ! interface Ethernet0 ip address 192.168.1.254 255.255.255.0 no keepalive ! interface Ethernet1 ip address 192.168.2.1 255.255.255.0 ! interface Ethernet2 --More-- router ospf 1 network 192.168.2.0 0.0.0.255 area 0 network 192.168.1.0 0.0.0.255 area 1 area 1 virtual-link 2.2.2.2 Current configuration: ! version 10.2 service tcp-small-servers ! hostname dogbert ! enable password lab ! ! interface Loopback0 ip address 3.3.3.3 255.255.255.0 ! interface Ethernet0 ip address 192.168.2.254 255.255.255.0 ! interface Ethernet1 no ip address shutdown ! interface Fddi0 no ip address no keepalive shutdown ! interface Hssi0 no ip address shutdown ! interface Serial0 no ip address shutdown ! interface Serial1 no ip address shutdown ! router ospf 1 network 192.168.2.0 0.0.0.255 area 0 ! ! ! line con 0 line aux 0 transport input all --More-- [GroupStudy.com removed an attachment of type application/x-mspowerpoint which had a name of logical_diag_v3.ppt] FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=683t=674 -- FAQ, list archives,
designing subnets with all ones/zeros.. [7:695]
I have two questions regarding using the all ones and/or the all zeros subnet. Recently one of my co-workers started studying for CCNA and while reviewing subnets he kept telling me that you could not use the all zero or all ones subnet. The Win95, NT, and LINUX hosts didn't have a problem with it nor did the routers. I tested it with RIP EIGRP. (skipped OSPF since it is classful). I found that Cisco and others vendors agree that it will work, but they "Strongly discourage using the all ones or all zeros subnets" PS: if some of you try testing this; note that prior to 12.1 you'll need to enter (config)# ip zero-subnet before the router will accept a zero subnet on a interface. Starting in 12.1 the zero subnet is enabled by default. Question #1: What type problems could you run into by using a all ones/zero subnet. Question #2: For you folks that are in design; Do you follow or ignore the "DO NOT USE ALL ONES/ZEROS" rule? I'm trying to get a real world idea of what the standard practice is. I work at a large corp, so I haven't a clue what sane people do. DaveC Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=695t=695 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: sanity check - NAT [7:410]
Seem to be missing a couple of things. 1. The serial interface is not running IP. 2. Once you NAT the packets and send them on to the next-hop router; how does the next-hop router network know to return the packets to this router? Assuming that you are using static routes, and the portion of the config with the serial IP was left out; it should work fine. DaveC Irwin Lazar wrote: I need to turn on NAT in a 2500 running Firewall IOS 11.3. It's been a year since I touched a router, so I wanted to run the config by the group for a sanity check. (addresses have been changed to protect the innocent) Here's what I'm trying to do: NAT pool (legal addresses) 203.181.70.65 to 203.181.70.94 (slash /27) Hosts will get addresses via DHCP in the 192.168.1.0 /24 range The Inside address 192.168.1.11 should statically translate to 203.181.70.91 (that is, hosts on the Internet that try to connect to 203.181.70.65 should hit the NAT box, where they are redirected to 192.168.1.11) Here's my config: interface e0 ip address 192.168.1.1 255.255.255.0 ip nat inside ! defines e0 with IP address and inside NAT interface interface s0 ip nat outside ip nat pool overld 203.181.70.65 206.181.70.90 prefix 27 ip nat inside source list 7 pool overld overload access-list 7 permit 192.168.1.0 0.0.0.255 ip nat outside source static 192.16.1.11 203.181.70.91 ip nat inside source static 203.181.70.91 192.16.1.11 Before I slap this on my router, will it work as intended? FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=425t=410 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: 2611 and reverse telnet
I believe that Kevin may be on the right track. The TTY and the CON ports are DCE ports. You'll need the octopus equivalent to a cross-over cable. I don't remember the pin outs, they're on CCO some where. DaveC Kevin Wigle wrote: ok - be that way. :-) alright, got a 2509 at home with me and here are the relevant lines ip host r3102 2001 10.0.0.1 ip host r804 2002 10.0.0.1 ip host r4500 2004 10.0.0.1 interface Loopback0 ip address 10.0.0.1 255.0.0.0 line 1 8 no exec transport input all essentially the same as you have. I would now question what you're connecting to. Routers with a RS-232 type connector (older series like 3000, 4500/4000, Cat5000, etc) or routers with a RJ-45 connector on the console port (like 2600/3600, 2500. If a RS-232 type - what kind of adaptor are you using? I guess first, does your cable have RJ-45 or RS-232 connectors? In any event - the correct adaptors will be required. At both home and at work the octopus uses RJ-45 cable ends and we have both RJ-45 and RS-232 ports (with adaptors) and everything works fine. It is possible that the octopus is bad. Has it worked on another terminal server? Do you have another one to try? (cable/router) On the routers connected, can you access them through their console ports with a laptop on the serial port? (using the same adaptors???) I'm looking at a possible setting issue here on the console port. (or an adaptor problem) just about out of ideas for now. Kevin Wigle - Original Message - From: "perryb" [EMAIL PROTECTED] To: "Kevin Wigle" [EMAIL PROTECTED]; [EMAIL PROTECTED] Cc: "John Neiberger" [EMAIL PROTECTED] Sent: Thursday, 05 April, 2001 01:08 Subject: Re: 2611 and reverse telnet Well, I blew that! I actually have a "2511" not a 2611...don't know why I've had 26 on my mind today :-) In any case, the original line asignments (1-16) are correct and the blasted thing still does the same. FYI: 0 CTY -- --- 2 0 0/0 - 1 TTY 9600/9600 -- --- 0 0 0 - 2 TTY 9600/9600 -- --- 0 0 0 - 3 TTY 9600/9600 -- --- 0 0 0 - 4 TTY 9600/9600 -- --- 0 0 0 - 5 TTY 9600/9600 -- --- 0 0 0 - *6 TTY 9600/9600 -- --- 7 1 0 - 7 TTY 9600/9600 -- --- 0 0 0 - 8 TTY 9600/9600 -- --- 0 0 0 - 9 TTY 9600/9600 -- --- 0 0 0 - 10 TTY 9600/9600 -- --- 0 0 0 - 11 TTY 9600/9600 -- --- 0 0 0 - 12 TTY 9600/9600 -- --- 0 0 0 - 13 TTY 9600/9600 -- --- 0 0 0 - 14 TTY 9600/9600 -- --- 0 0 0 - 15 TTY 9600/9600 -- --- 0 0 0 - 16 TTY 9600/9600 -- --- 0 0 0 - 17 AUX 9600/9600 -- --- 0 0 0 - * 18 VTY -- --- 6 0 0 - 19 VTY -- --- 0 0 0 - 20 VTY -- --- 0 0 0 - 21 VTY -- --- 0 0 0 - 22 VTY -- --- 0 0 0 - - Original Message - From: "Kevin Wigle" [EMAIL PROTECTED] To: [EMAIL PROTECTED]; "perryb" [EMAIL PROTECTED] Cc: "John Neiberger" [EMAIL PROTECTED] Sent: Wednesday, April 04, 2001 9:26 PM Subject: Re: 2611 and reverse telnet your line assignments are incorrect. We have a 16 port async module (NM-16A) in a 2611 and the first 16 ports are 33-48 NOT 1-16 Here are bits from our config: ip host LabR6 2042 1.1.1.1 ip host LabR5 2035 1.1.1.1 ip host LabR7 2037 1.1.1.1 interface Loopback0 ip address 1.1.1.1 255.255.255.0 line 33 48 no exec transport input all and a show line really tells all with these results: terminal#sh line Tty Typ Tx/RxA Modem Roty AccO AccI Uses Noise Overruns Int 0 CTY -- --- 10 0 0 - 33 TTY 9600/9600 -- --- 15842 0 - 34 TTY 9600/9600 -- --- 1 1 0 - 35 TTY 9600/9600 -- --- 302130 0 - 36 TTY 9600/9600 -- --- 1 0 0 - 37 TTY 9600/9600 --
Re: why the modem doesnot dial after 10s?
One thing I notice is that you have the line speed for aux 0 set for 115200. Isn't the aux port only capable of 38400? If you do repeated SHOW LINE you'll see it cycling thru different speeds. Let us know what you find out... DaveC leo wrote: the modem is connected to the aux,but after the s0 is down,the modem doesnot dial,why? the following is the config: Router#show conf Using 2413 out of 29688 bytes ! version 12.1 service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname Router ! enable secret 5 $1$aStq$3UYrVYPDvQrw4Bg.eB3Qn1 enable password cisco ! username guest password 0 guest username delta password 0 delta username test1 password 0 cisco ! ! ! ! memory-size iomem 25 ip subnet-zero no ip domain-lookup ip host modem 2002 192.168.3.10 ip dhcp excluded-address 192.168.3.10 ip dhcp excluded-address 192.168.3.190 192.168.3.200 ip dhcp excluded-address 192.168.3.1 192.168.3.10 ! ip dhcp pool delta network 192.168.3.0 255.255.255.0 dns-server 210.78.28.29 default-router 192.168.3.10 netbios-name-server 192.168.2.1 netbios-node-type h-node lease 5 ! ip address-pool local chat-script zhongda "" "AT" TIMEOUT 30 OK "ATDT 1626053313501773113" TIMEOUT 30 CONNECT \c ! ! ! interface Serial0 backup delay 5 30 backup interface Async5 ip address 1.1.1.2 255.0.0.0 encapsulation ppp no fair-queue ! interface Serial1 physical-layer async ip address 3.3.3.3 255.255.255.0 encapsulation ppp keepalive 10 dialer in-band dialer idle-timeout 300 dialer map ip 3.3.3.5 name test1 modem-script zd broadcast 8537 dialer-group 1 async default routing async mode dedicated pulse-time 1 ! interface FastEthernet0 ip address 192.168.3.10 255.255.255.0 speed auto ! interface Async5 ip address 3.3.3.1 255.255.255.0 encapsulation ppp dialer in-band dialer wait-for-carrier-time 60 dialer map ip 3.3.3.2 name routerb modem-script zhongda dialer-group 1 async dynamic address async dynamic routing async mode dedicated pulse-time 1 ppp authentication pap ! ip local pool default 192.168.3.200 192.168.3.210 ip classless ip route 172.18.76.0 255.255.252.0 1.1.1.1 ip route 192.168.2.0 255.255.255.0 1.1.1.1 ip route 192.168.4.0 255.255.255.0 1.1.1.1 no ip http server ! access-list 101 permit ip any any dialer-list 1 protocol ip list 101 ! line con 0 transport input none line 2 autoselect during-login autoselect ppp login local modem InOut modem autoconfigure discovery transport input all stopbits 1 speed 115200 flowcontrol hardware line aux 0 line aux 0 autoselect during-login autoselect ppp script dialer zhongda login local modem InOut modem autoconfigure discovery transport input all stopbits 1 speed 115200 flowcontrol hardware line vty 0 4 password router login ! no scheduler allocate end please help me! _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Enterprise Management Specialization
CCNP+Management Specialists: I have been trying to determine the scope of the CCNP+Management tests, and have not been having much luck. CEMS is recommended but the MCRI MCSI were not based on CEMS; and there are not even exam topics for MCSI. I am trying to determine if the MCRI and MCSI test are based the older software? I am currently working with a group at work to implement HP OpenView CW2000 with all the bells and wistles; so I am more familiar with the newer features. If the current MCRI MCSI are based on the older software I'll just wait for the revamped Qualified Cert. Thanks DaveC CCDP/CCNP etc, etc, etc. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: challenge problem
Have you checked for clocking issues between the Router and the DSU? (garbage-in garbage-out) I have seen that issue many times. Check the DSU's config vs a known good config. Are the errors also being seen on the carrier's frame-switch interface? The guys who test the circuit do not ussually have access to that info They just test from their test point to your csu... Good Luck Dave Brian wrote: On Tue, 10 Oct 2000, Fred Flinstone wrote: ok here it goes we have a customer we manage that is incurring CRC'c, input errors etc on there serial interface. new install or working install? 1. stress tested the circuit many times from the frame cloud through the csu as good What type of loopbacks did you do? (different loopbacks only go thru different parts of circuitry in a csu) 2. tries verious cables 3. there are no interface modules i believe its a 2500 something router but i can check if its a 2500, and you suspect possible serial port problem you can always try the other serial port for good measure, although hardware failure is probably low on the list I would say. 4. the only times crc's cross the link (verified by a protocol analyzer) is when we telnet from our management platform to the site...even if i just enter one character in the telnet session crc's increment Are you seeing carrier transitions on one end and interface resets on the other? 5. if you telnet from a neighboring router or dial in this produces no crc's what so ever. - we have 3rd level engineers looking at this i bet if you find an answer I could get you a nice paying job...:) (well maybe) - any help would be appreiciated Brian - thanks...kyle _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- Brian Feeny, CCNP, CCDP [EMAIL PROTECTED] Network Administrator ShreveNet Inc. (ASN 11881) **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
