Re: Gateway of last resort ?
Hi, Howard.
I just want to know what you mean by "subscribers only".
Does that mean you're running your own mailing list or something like
that? It seems to me it's just portion of what you've published on
that list before. Or from CertificationZone, maybe.
Well, I'm just curious about what missing "A" will be like.
Thanks
Regards,
Jaeheon
On 28 Jan 2001 20:57:10 -0500, [EMAIL PROTECTED] ("Howard C. Berkowitz")
wrote:
>subscribers only), Routing Principles and IOS Implementation
>Considerations:
>
>B. Default Whatevers
>You will run across several terms that are often, and incorrectly,
>considered synonymous: default routes, default gateways (default
>routers), default networks, and gateways of last resort. These terms
>refer to slightly different mechanisms, all of which are useful. This
>section explains what each mechanism does.
>
>1. Default Route
>
>By convention, the address 0.0.0.0/0 is the default route, the least
>specific possible route. Cisco sometimes uses the term pseudonetwork
>to refer to 0.0.0.0/0. It is the route that you go to when you don't
>have anyplace else to go. When it came time to pick softball teams in
>my high school physical education classes, I was the default route.
>
>As opposed to being something to put in right field and forget,
>default routes are quite useful in networking. They can be declared
>with static routes, or they can be learned from dynamic routing
>protocols. To create a static route defining the local default, code:
>
> ip route 0.0.0.0 0.0.0.0 {next hop IP | outgoing interface}
>
>Created as a static route with an administrative distance less than
>dynamic routing, a default route in the next-hop-ip format will be
>used for the local router box, but not advertised unless it is
>explicitly redistributed (or you use the outgoing interface form of
>the static route command).
>Statically declared default routes of the interface-name format will
>be advertised as if they were directly connected.
>
>Local configuration is not the only way your router can learn the
>0.0.0.0/0 default route. It can be learned from dynamic routing
>protocols such as OSPF and RIP. In the more recent IOS releases, you
>can originate default from any of these routing processes with the
>default-information-originate command. When you do this, the process
>will advertise default to other routers, although it might use,
>itself, the static route.
>default-information-originate has an optional parameter, the always
>keyword. If you don't use always, the router will advertise default
>only if it itself has an active default route.
>
>With always, the router will always advertise default, and will have
>the behavior that it will blackhole routes to unknown destinations if
>there is no default. A typical application for always would be where
>you have a single ISP link to which you default, so you might as well
>blackhole if you can't get to it.
>
>2. Default Gateway
>
>The default gateway is specifically intended for the situation when
>no IP routing is enabled. It has the specific next hop address of the
>gateway router.
>
>You would use this on a switch, or a router box that is only doing
>bridging, so the box can reach network management servers not on the
>same subnet. Another application for the default gateway comes during
>booting from ROM, to find the TFTP server.
>
>In the IOS, you configure an IP default gateway with the command:
>
>ip default-gateway gateway-address
>
>where gateway-address is the address of a router interface on a
>subnet to which your router is physically connected.
>
>3. Default Network
>
>The default network, used by IGRP and EIGRP, has only a prefix -- a
>network or subnet -- so unless internal assumptions are made, there's
>no way to know the specific next hop address.
>
>Always remember the KISS (Keep it simple, stupid) rule. Once you
>understand what command is intended to do something, it isn't always
>useful to keep looking for commands that might do the same thing. The
>major reason to look for obscure command interpretations is that they
>may be the cause of problems you are troubleshooting.
>
>In the real world of network design, the KISS rule is critical. On
>the CCIE test, however, be prepared to be faced with scenarios that
>violate this rule. One of the drivers of CCIE scenario writers seems
>to be that you are very familiar with obscure parts of the IOS
>command language. In addition, some CCIE lab scenarios may seem quite
>contrived, due to the relatively small number of available routers.
>
>For those of you who have taken ACRC, you have had an experience that
>will give you perspective on odd scenarios you may see. ACRC's
>redistribution and BGP scenarios are very unrealistic with respect to
>plausible real-world configurations. They are the best that can be
>done with the standard classroom lab and its topology.
>
>See Scenario 2 for examples of the various default mechanisms.
>
>To
Re: ccnp voice certification
Hi,
How about this one?
http://www.amazon.com/exec/obidos/ASIN/1578701961/qid%3D980801700/107-4508504-6673344
This is highly recommended by Priscilla as one of the technical
reviewers of this book. Unfortunately I've never read it.
But I'm planning to when I'm done with my CCNP.
Regards,
Jaeheon
On 29 Jan 2001 15:17:19 -0500, [EMAIL PROTECTED] ("umerkhan") wrote:
>hello=20
>
>can anyone suggest me any book or guide for the prepration of the ccnp =
>cvoice certification (640-647 CVOICE)
>
>thanx,
>umer
>
>_
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Re: Cisco Pro vs 2501
Hi, Mark
Before you upgrade your CPA to 2500 series(it will take you two
steps), you have to make sure that it should meet the memory
requirement of a new IOS, because some of that model have only 4MB
Flash memory in it. Well, that's the case for my own CPA 2501.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios112/fp112rn/25_112rn.htm#41930
Hope this will help,
Regards,
Jaeheon
On 29 Jan 2001 22:21:31 -0500, [EMAIL PROTECTED] ("Mark Rose")
wrote:
>Can someone tell me the difference between a Cisco Pro (Access) 2501(white
>case) and a 2501 (in familiar grayish case)?
>
>TIA
>Mark Rose
>
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Re: EIGRP Metrics
Hi, Richard I guess what you are missing is in the confusion between FD and RD. Feasible Distance: The current best distance (metric) to a destination. In other words, the metric through the successor. Reported Distance: The distance from the successor to the destination network These definitions are from the same white paper. In the case you've mentioned, RD is 7181506(minBandwidth:384k, total Delay: 20100), 7693056 would be its FD. RD is literally "reported distance" from its neighbors, so the delay and bandwidth of its own outgoing interface to that neighbor isn't considered in RD. Hope this helps Regards, Jaeheon On 31 Jan 2001 12:20:25 -0500, [EMAIL PROTECTED] (Richard Wilson) wrote: >Hi > >No matter what I do, I can't seem to get the EIGRP >metrics to add up. We all know they consist of Delay, >Bandwidth, Load and Reliability. If K1 and K3 = 1 and >the rest 0, then the formula boils down to >(10**7/BW+delay)*256. > >I'm looking at an example in the certificationzone >white paper which shows a bandwidth of 384 kbit and a >total delay of 40100 microseconds. No matter what I >do, I can't come up with the reported metric of >7693056. > >What am I missing? > >Richard > > >__ >Get personalized email addresses from Yahoo! Mail - only $35 >a year! http://personal.mail.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]
Re: VLANS and DHCP
Hi, One more trivial thing: When you decide to deploy more than two DHCP servers for redundancy, it is necessary to divide each total IP pool allocated to that subnet or scope appropriately. DHCP servers don't communicate with each other, so if you don't take that into account, the chances of overlapping IPs being assigned will be high. Regards, Jaeheon On 1 Mar 2001 13:47:23 -0500, [EMAIL PROTECTED] (Marcos Pacheco) wrote: >Hi Chris: > >You can use only one server for DHCP purposes, and you >must to enable the ip helper-address option in each of >the interfaces of the router, I mean: > >Int vlan1 >ip address ip1 mask1 >ip helper-address >ip helper-address > > >Int vlan2 >ip address ip2 mask2 >ip helper-address >ip helper-address > > > > > >Int vlann >ip address ipn maskn >ip helper-address >ip helper-address > > > >In this case, we are using two DHCP servers in >different locations (just in failure case), but you >can use one, two, whatever). > >Regards: >Marcos Pacheco. >Routing and Switching CCNP. > > >--- Chris Sees <[EMAIL PROTECTED]> escribi?: > HI, >> Does anyone have suggestions for implementing DHCP >> in an enterprise >> environment that wants to use VLAN's (for >> administratve, regular users, >> etc. - for security purposes) and DHCP at the same >> time? It seems like you >> would need multiple DHCP servers (carefully placed). >> ? >> Thanks in advance. >> >> >> Chris >> >> >> _ >> FAQ, list archives, and subscription info: >> http://www.groupstudy.com/list/cisco.html >> Report misconduct and Nondisclosure violations to >[EMAIL PROTECTED] > > >_ >Do You Yahoo!? >Obtenga su direcci?n de correo-e gratis @yahoo.com >en http://correo.espanol.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]
Re: Cisco IOS security flaw
Hi,
What about telnet session to a cisco router?
And BGP peering also, those two are what ocurred to me at the moment.
Regards,
Jaeheon
On 5 Mar 2001 12:33:13 -0500, [EMAIL PROTECTED] ("Watson, Rick,
CTR, OUSDC") wrote:
>As you all may have heard about the warning from Cisco concerning a flaw in
>the IOS. It states "the flaw affects the security of only TCP connections
>that originate or terminate from the device itself, not any traffic that
>passes through the device in transit."
>
>My question to the group is, can someone elaborate on the types of TCP
>connections that would originate/terminate at a Cisco device? I am sure that
>this s an easy answer, but one that puzzles me. Thanks for the help.
>
>Rick Watson
>Network Engineer
>OUSD(Comptroller)
>703.697.5710
>[EMAIL PROTECTED]
>
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Re: Passed CIT
Hi, Taiwo Congratulations!!! ^^ I myself passed the last exam of "CCNP journey" a few days ago. It was tough as some people said. Chappell's CIT book and Priscilla's flash card were two most important sources for the study as Taiwo suggested. (http://www.priscilla.com/cit/toc.html) Thanks, Priscilla. And thanks everyone. Now on to CCIE written. Jaeheon. On 16 Mar 2001 08:29:19 -0500, [EMAIL PROTECTED] (Taiwo Adeshugba) wrote: >Hi Everyone, > >I passed the last exam of the CCNP journey this morning and it was a rough >road. The exam as some people have put it was a tough one as I had to read >the questions twice to understand what they were asking. For those who have >not taken the exam read the CIT book by Laura Chappell, I also supplemented >it with the new Cisco support book and try your hands on Colt as I met some >questions that were similar. OH Priscilla your Flashcards were great on the >CIT question and I am happy I used them. >Anyway CCNP at last its time to celebrate and hit the books after a deserved >rest. > >Thanks Everyone > >Tai > >_ >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]
Re: Help about BGP regular expression
Hi,
I quite agree with vtam,
>From p.376 of "Internet Routing Architectures" Sec. Edition,
ip as-path access-list 4 permit ^1 ?[0-9]*$
This has some side effects, which allow as-paths such as 109, 110, 120
like vtam has pointed out, in addition to "all the AS paths that start
with 1 and that are of length 2-that is, AS1 and its direct customers"
I think the right answer would be as follows:
ip as-path access-list 4 permit ^1 [0-9]*$
ip as-path access-list 4 permit ^1$
The first line is for its direct cumstomers, and the second line for
its local networks. I'm afraid there's no one line version of this.
Am I right?
On 1 Dec 2000 11:41:56 -0500, [EMAIL PROTECTED] ("michael champion")
wrote:
>Although I am by no means a regular expression expert, I do not believe that
>^1 [0-9]*$ will match an AS-path of 1; the space forces a requirement of a
>maximum of two path elements, with the first element a 1. A single AS-path
>of 1 would not match. Multiple AS-path elements are separated by a space .
>Thus, the expression would match 1 100, 1 200, 1 1, 1 {any AS number}, but
>would not match just 1. What is confusing about regular expressions is that
>every element in the expression is an operator, and sometimes you have
>operators acting on other operators. Thus .* matches all paths because . is
>an operator representing any single character and * is an operator
>representing . repeated as many times as necessary (not just the particular
>character that . matched). This is thus equivalent to .., ..., , etc. as
>many times as necessary.
>
>Powerful, but cryptic, and not well-documented at all by Cisco (who knows
>which type of regular expression engine they are using?) This all comes from
>the Unix world, which is why you see it in Perl, Tcl, egrep, etc.
>
>Regards,
>MLC
>"vtam" <[EMAIL PROTECTED]> wrote in message 907i83$9l6$[EMAIL PROTECTED]">news:907i83$9l6$[EMAIL PROTECTED]...
>> The space is the books. Because it said it match all the AS_paths that
>start
>> with 1 and of length 2, such as AS_path=1, =1 10, =1 200, etc. As you
>said,
>> ? # 0 or 1 of the preceding characters (in this case a space). So if ?=0,
>it
>> is ^1[0-9]*$; if ?=1, it is ^1 [0-9]*$.
>> Do i misread your meaning?
>>
>>
>> "Drew Simonis" <[EMAIL PROTECTED]> wrote in message
>> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
>> >
>> > ^1 ?[0-9]*$
>> > ^
>> > ^
>> >
>> > Is that space yours or the books? Broken apart, that regex matches
>> > (assuming standard egrep'ish metachars)
>> >
>> > ^ # beginning of line
>> > 1 # followed by the digit 1
>> > (space) # followed by a space
>> > ? # 0 or 1 of the preceding characters (in this case a space)
>> > [0-9] # a single digit within the range of 0-9
>> > * # 0 or more of the preceding characters, up to the end of
>> > # the pattern
>> > $ # end of line char
>> >
>> > So, is this equivalent to ^1[0-9]*$? I don't think so. Assuming
>> > that the pattern with a space was a typo, we are allowed an
>> > optional 1. Assuming it wasn't a typo, we are allowed the space
>> > character. Neither of these options would be matched by your more
>> > restrictive pattern. As for the specific pattern to match, you
>> > can't really say without knowing what you are matching with.
>> >
>> > Different regex engines support different metachars.
>>
>>
>>
>> _
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>
>
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Re: BGP Regexp and filter question
Hi, In my humble opinion, how about this one? Let me suppose your provider's AS number is 1: ip as-path access-list 4 permit ^1 [0-9]+$ ip as-path access-list 4 permit ^1$ You can also check threads "Help about BGP regular expression". and "Internet Routing Architecture" pp. 370~378 On 6 Dec 2000 02:07:52 -0500, [EMAIL PROTECTED] (John Neiberger) wrote: >I'm in a multihoming situation where, so far, one provider is telling me >they can only send the full routing table without some special arrangements. >This sounds like a load of bullhockey, but that's what they're saying. So, >here's the question... > >I only want to receive from both ISPs their routes and their customer >routes. Then, I'll have a default route to the better ISP with a backup >default to the second ISP. > >Is there a way to filter out the routes I don't want using regular >expressions? I couldn't figure out how to accept an ISP's routes plus their >customer routes while not accepting everything else. One ISP tags those >routes allowing me to filter by community attribute, but the other is >playing dumb. (The dumb one is Sprint, and it seems they are being a pain >just because they can.) > >It's late, my brain is toast, and I'm tired of thinking about it. Regular >expressions give me a headeache, anyway. Any ideas on how to do this? > >Many thanks as always, >John > > > > > >___ >Tired of slow Internet? Get @Home Broadband Internet >http://www.home.com/xinbox/signup.html > >_ >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]
What cisco router platforms are usually deployed for BGP full routes(ie, 75000) ?
Hi, while I'm reading Halabi's book, I'm getting curious. Please let me know what cisco router platforms are usually deployed for BGP full routes? In addition to that, what are platforms for partial routes and for default routes only? Thanks in advance. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ospf process id / AS??
I think that's where BGP fits in.
IGRP, RIP, EIGRP, OSPF and IS-IS are all Interior Gateway
Protocols(IGPs), and BGP is a Exterior Gateway Protocol(EGPs)
So in BGP Autonomous Numbers are actually used.
for example; router bgp 3 <--- 3 means autonomous number
one cent after reading Halabi's book,
On 7 Nov 2000 11:47:41 -0500, [EMAIL PROTECTED] ("Shaw,
Winston Mr.") wrote:
>The concept of an Autonomous System is carried in the AREA(S) used by OSPF.
>There are 4 things which enable OSPF routers to become adjacent in the same
>area.
>
>Area Identification
>Authentication
>Hello and Dead Intervals
>Stub Area Flag
>
>However, the AS may consist of several areas arranged in a hierachy with
>Area 0 at the top.
>
>The AS can seen as a group of one or more areas under the same
>administration.
>
>The router process-id only identifies a particular separate algorithm of
>OSPF. There can be more than one OSPF process running on the same routers in
>the same area.
>
>Hope it helps.
>Winston.
>
>> -Original Message-
>> From:Jeff McCoy [SMTP:[EMAIL PROTECTED]]
>> Sent:Tuesday, November 07, 2000 3:26 PM
>> To: [EMAIL PROTECTED]
>> Subject: ospf process id / AS??
>>
>> If the process id is defined as 200 in the command:
>>
>> router ospf 200
>>
>> and this is not the AS, then where is the AS defined?
>>
>> -jm
>>
>>
>> _
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On RFC2328 - OSPF 2
Hi, Merry Christmas and Happy New Year to All! I'm reading RFC 2328, fortunately most part of it is understandable for me. But "16. Calculation of the routing table" part is extremely hard to follow. Although Jeff Doyle's explanation of Dijkstra's algorithm sounds easy and interesting, why is it so tough in original document? Is this essential or required for me to thoroughly understand it in its original terms? In that case, are there any plain language version of it out there? Thanks in advance _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: OSPF summary problem!
Hi, Mohamed. This is just my humble opion in line. On 29 Dec 2000 14:40:11 -0500, [EMAIL PROTECTED] (Mohamed Heeba) wrote: >i was trying the Fatkid 501 redistribution lab when i got this problem > >the lab is 5 routers , 3 of them (R1,R2,R3) are in area 0 over Frame relay >with a subnet of 28 bit mask >one of this routers ( R3) are connected to another router ( R4) forming area >3 on the link between them , and another area on its loopback interface >(area 2 ) A loopback interface in OSPF is treated a host route (a stub network) unless it's configured as point-to-point network type explicitly. So I believe area 2 is meaningless here. > >now R4 is connected to another router (R5) and the link between them is >running IGRP with subnet of mask 24 ...i hope this is clear to you First, you should NOT establish a virtual-link between R3 and R4 unless R4 is a ABR between area 3 and another non-backbone area(for example, area 4) which is not directly connected to the backbone area. A virtual-link is needed when the only way to the backbone area is through another non-backbone area(a transit area). In this case R4 is not a ABR if you don't configure some other interface as another nonbackbone area , which you didn't mention it. But R4 can be a ASBR if R4 is redistributing IGRP learned routes into that OSPF process domain. Second, IGRP is a CLASSFUL routing protocol. What it means is IGRP is accepting subnet routes only if their subnet mask is the same as configured on one of its local interfaces of the same major network. In this case, subnet masks are different even if they are from same major network. (major network means Class A, B, or C network here) So, ospf subnets are not getting through to IGRP. > >the problem is >i have formed a virtual link between R4 and R3 and things looked fine to me >BUT when i redistribute the OSPF to the IGRP , the 28 bit subnet never >appeared to R5 >i summarized the network , trying the AREA range command at R3 , then at R4 > i tried also the summary-address at R4but the subnet never appeared in >R5 summary-address command is needed when you are redistributing routes from another source INTO its ospf process domain, which is not the case in this situation. I hope this will be of a little help to you. Thanks >although some other networks ( of 26 bit masks) appreared fine when i >summarized them at 24 bit boundry >can anyone knows where is the problem ?? > > >NOTE:when i configured the frame relay interfaces as point-to-mulitpoint , >only the 32 address appreared in the routing tables , when i changed the >network type to broadcast type , the 28 bit subnet appeared ..but still it >didnt go to the far IGRP router ... >wat is the problem > > > >Mohamed HEEBA > > > > > > >_ >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]
Frame Relay - can't get the clear picture of it yet!
Hi, Before I bother you about this, I searched the archives, but I can't get it clear to me. Sorry but this has been constantly irritating me. I quess there's a big BUG in my understanding. This example is roughly from Jeff Doyle's Routing TCP/IP pp.557~565 There is a star topology frame relay network. HQ is a hub router with three branch routers BR1 , BR2 and BR3. Branch routers have only one PVC each to HQ(This is a partially meshed FR network). (point-to-point subinterfaces are not configured) Please correct me if I'm wrong! CASE 1 - UNICAST packet: Can BR1 ping to another branch router BR2?(I believe so) If it's YES, HQ is responsible for "relaying" ping to BR2. What's happening is as follows: 1. BR1 originates a ping packet and encapsulates it with its own locally significant DLCI number (for example, 200) 2. It is propagated via the established PVC through F/R Cloud to HQ with HQ's local DLCI number (for example, 100: I understand there's no direct correspondence between two DLCI numbers), 3. HQ's layer 2 (ie,F/R) strips F/R header off the received frame and examines its destination IP, then decides it doesn't belong to HQ itself. 4. HQ's layer 2 looks up its frame relay maps configured statically or dynamically(through Inverse ARP). If there is a matching entry for it, It is properly encapsulated and propagated to BR1. If there's no matching entry for it, HQ just drops it. 5. Finally BR2 receives the frame. CASE 2 - BROADCAST packet: Can BR1 send RIPv1 updates to all other branch routers BR2 and BR3 as well as to HQ. (I believe so) 1. BR1's RIP delivers RIPv1 updates to lower layer F/R, and if F/R is not configured to propagate broadcast traffic, the packet is dropped, Otherwise, if it is configured so through frame-relay map command) It is propagated to HQ as explained step 1 of case 1. But in this case destination ip is set to broadcast address 255.255.255.255. 2. In this case, HQ recognizes it as broadcast packet, so HQ replicates and propagates the broadcast traffic to each PVC except originationing PVC 3. BR2 and BR3 receives the frame. CASE 3 - BROADCAST revisited: If BR2 and B3 are directly connected, from my understanding of CASE 2, there might be a broadcast storm like what happens on LAN Switching. All of this probable misunderstanding is due to my lack of field experience. So I always try to read widely, which is the only way I can do now. Please correct my ignorance. Thanks in advance. Jaeheon Yoo _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Frame Relay - can't get the clear picture of it yet!
Hi, I have revised it myself through some more research. - Original Message - From: "Jaeheon Yoo" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, January 02, 2001 6:38 AM Subject: Frame Relay - can't get the clear picture of it yet! > > Hi, > > Before I bother you about this, I searched the archives, but I > can't get it clear to me. Sorry but this has been constantly irritating me. > I quess there's a big BUG in my understanding. > > This example is roughly from Jeff Doyle's Routing TCP/IP pp.557~565 > > There is a star topology frame relay network. HQ is a hub router > with three branch routers BR1 , BR2 and BR3. Branch routers have only one > PVC each to HQ(This is a partially meshed FR network). > (point-to-point subinterfaces are not configured) > > Please correct me if I'm wrong! > > CASE 1 - UNICAST packet: Can BR1 ping to another branch router BR2?(I > believe so) If it's YES, HQ is responsible for "relaying" ping to BR2. "Relaying" is actually "Routing". > What's happening is as follows: > > 1. BR1 originates a ping packet and encapsulates it with its own locally > significant DLCI number (for example, 200) Step 1 needs some enumeration. After BR1's IP layer decides BR2 is directly connected on its F/R interface, it delivers the ping packet to layer 2(F/R) for encapsulation. Then F/R looks up frame-relay maps (in this case, the same DLCI number for BR2 MUST be "statically" mapped, because Inverse ARP only provides DLCI for HQ), if a matchng entry is found, it is properly encapsulated and propagated to HQ. If not, the ping packet is just dropped. http://www.cisco.com/warp/public/125/15.html#15-A > > 2. It is propagated via the established PVC through F/R Cloud to HQ with > HQ's local DLCI number (for example, 100: I understand there's no direct > correspondence between two DLCI numbers), When it is sent, the frame has a DLCI configured at BR1, when received it has a DLCI configured at HQ. Through the F/R cloud a F/R switch changes it as preprogrammed. > > 3. HQ's layer 2 (ie,F/R) strips F/R header off the received frame and > examines its destination IP, then decides it doesn't belong to HQ itself. In this part, what is actually examing its destination ip is NOT layer 2(F/R) BUT layer 3(IP), it consults routing table for its destination. And it decides it's directly connected on the same coming interface, therefore it decrements TTL by one and delivers the packet to layer 2(F/R) > > 4. HQ's layer 2 looks up its frame relay maps configured statically or > dynamically(through Inverse ARP). If there is a matching entry for it, > It is properly encapsulated and propagated to BR1. If there's no matching > entry for it, HQ just drops it. > > 5. Finally BR2 receives the frame. > > > CASE 2 - BROADCAST packet: Can BR1 send RIPv1 updates to all other branch > routers BR2 and BR3 as well as to HQ. (I believe so) > I guess I was wrong on this. In some how, update routing information could be delivered to other branch routers, but the same original broadcast packet never get to other branch routers, even if broadcast is enabled. So following step 2 and step 3 is totally wrong. > 1. BR1's RIP delivers RIPv1 updates to lower layer F/R, and if F/R is not > configured to propagate broadcast traffic, the packet is dropped, > Otherwise, if it is configured so through frame-relay map command) > It is propagated to HQ as explained step 1 of case 1. But in this case > destination ip is set to broadcast address 255.255.255.255. > > 2. In this case, HQ recognizes it as broadcast packet, so HQ replicates and > propagates the broadcast traffic to each PVC except originationing PVC > But the packet is self originated, it replicates and propagates the broadcast traffic to each broadcast enabled PVC. And what is responsible for "replicating" is HQ's layer 2(F/R). Am I right? > 3. BR2 and BR3 receives the frame. > > CASE 3 - BROADCAST revisited: If BR2 and B3 are directly connected, > from my understanding of CASE 2, there might be a broadcast storm like > what happens on LAN Switching. I guess this is totally wrong. Please confirm my understanding. From this I concluded that what is important is: What type of the network it is viewed as, NBMA, point-to-point, or point-to-multipoint. My next question: Does branch router BR1 have the same routing table when it is configured as just NBMA and when as point-to-multipoint under OSPF? > > All of this probable misunderstanding is due to my lack of field experience. > So I always try to read widely, which is the only way I can do now. > Please correct my ignorance. > > Thanks in advance. >
Re: ccie qualification exam cleared
Congratulations! You must be well prepared. Let me share with you how you prepared for it. And good luck to your upcoming lab test. Regards Jaeheon - Original Message - From: "Dar" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, January 04, 2001 9:00 PM Subject: ccie qualification exam cleared > > Hi, > i cleared my written exam today,it was very basic but some statements were > very confusing. Do read them carefully. i got 91% > goodluck to those who r studying. > > Dar > MCSE, CCNA, CCNP. > > _ > 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]
Re: How to check IDB?
Hi, This is from "EIGRP Network Design Solutions" by Ivan Pepelnjak, p.296 NOTE: Using point-to-point subinterfaces in networks where the core router has several neighbors can also lead to Interface Descriptor Block(IDB) limit problems; most routers can support only up to 300 physical and logical interfaces when running Cisco IOS prior to version 12.0. The IDB limit is platform-dependent in IOS 11.1CA and IOS 12.0 and has been raised for the high-end routers like 7x00 series routers or AS5800 access servers. Hope this helps, And my router(11.2 enterprise) doesn't accept "sh idb". What IOS version does support it? Jaeheon Yoo - Original Message - From: "Katson PN Yeung" <[EMAIL PROTECTED]> Newsgroups: groupstudy.cisco To: <[EMAIL PROTECTED]> Sent: Saturday, January 06, 2001 2:15 AM Subject: Re: How to check IDB? > > Thanks Chris. > > Your information is very useful. > > Another question is, how can I know the IDB number for each IOS version? Any > place I can find such info? > > Many thanks to you. > > > > "Chris McCoy" <[EMAIL PROTECTED]> wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > > There's an undocumented command for showing the IDBs: > > > > [---Snip from Phrack 56---] > > > > @sh idb > > > > This command shows the hardware and software interface > > databases. > > this is cisco's way of keeping track of how many > > interfaces are present > > on the system.. includes hardware and software > > interfaces (physical, > > subinterfaces etc). there is a software limit of 1024 > > i believe in > > ios 11 and 2048 in ios 12. this is a global limit for > > the router. > > > > output: > > > > ctalkb#sh idb > > > > 19 SW IDBs allocated (2296 bytes each) > > > > 9 HW IDBs allocated (4008 bytes each) > > HWIDB#1 1 FastEthernet0/0 (Ether) > > HWIDB#2 2 Serial2/0:0 (Serial) > > HWIDB#3 3 Ethernet3/0 (Ether) > > HWIDB#4 4 Ethernet3/1 (Ether) > > HWIDB#5 5 Ethernet3/2 (Ether) > > HWIDB#6 6 Ethernet3/3 (Ether) > > HWIDB#7 7 Serial4/0 (Serial) > > HWIDB#8 8 Serial5/0 (Serial) > > HWIDB#9 9 Loopback0 > > > > Have fun... > > > > Chris M. > > > > --- Katson PN Yeung <[EMAIL PROTECTED]> wrote: > > > Dear all, > > > > > > When reading Caslow's book, there is a term called > > > IDB (Interface Descriptor > > > Block). It specifies the max number of interface the > > > router can have. > > > > > > Anyone knows which IOS command can check the IDB > > > number of a router? > > > > > > Thanks. > > > > > > > > > _ > > > 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! Photos - Share your holiday photos online! > > http://photos.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]
Re: OSPF/ DR & BDR election
Hi, Fowler.
I believe when you said "unplugged the Ethernet connection between the
two", what you really did seems to me that you unplugged Router A from
a hub or switch.
That means the Ethernet interface of Router A is DOWN in state, while
the counterpart of Router B is still UP and BDR in the beginning.
Because Router B is still connected to the hub, what Router B is
missing is just a neighbor(DR: Router A), not its "UP" interface
state. If Router B is disconnected from the hub, the election will be
triggered right after disconnection, you don't have to wait 40
seconds.But in that election no DR or BDR will elected, because
there's no up interface out there including itself..
Hope it helps,
Regards
Jaeheon
On 6 Jan 2001 22:03:59 -0500, [EMAIL PROTECTED] ("Fowler, Joey")
wrote:
>I setup OSPF on between two routers, and Router A was elected as the DR
>becuase it had the highest IP address. Router B was elected BDR. I ran debug
>ip ospf adj on Router B and unplugged the Ethernet connection between the
>two. After 40 seconds Router B showed that it promoted itself to DR. Then I
>plugged the connection back in, and Router A was now selected as the BDR.
>This didn't make sense to me. I know that each time a router is added, that
>a new DRand BDR election does NOT take place, however shouldn't Router A
>still considered itself as the DR so when the connection was re-established
>it would either 1. remain as the DR or more likely 2. rerun the election
>since both routers think that they are the DR. I might could understand if
>there were multiple routers on the Ethernet connection. Any elightenment
>would be greatly appreciated. Meanwhile I'll go look at RFC 2328.
>
>Joey
>
>_
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Re: IS-IS routing domain to look at
Hi, Chuck
How nice of you! I wanted to do some labs based on Jeff's book. But I
failed to get access to your lab. After some thoughts on how many
connections it can afford, I decided to back off because it's like a
lottery for at least hundreads of souls to compete for only 5 or so
connections.( line vty 0 4 in Cisco 2501)
Anyway, good attempt!
Thanks,
Jaeheon
On 6 Jan 2001 23:46:40 -0500, [EMAIL PROTECTED] ("Chuck Larrieu")
wrote:
>For those who haven't seen one before, I set up a quick and dirty IS-IS
>domain in my home lab. As I will be busy studying some other things the rest
>of the weekend, folks on the list here are cordially invited to take a peek.
>
>Telnet to 64.220.150.11 all passwords are cisco
>
>Feel free to poke around
>
>Please play nicely.
>
>
>Chuck
>--
>I am Locutus, a CCIE Lab Proctor. Xx_Brain_dumps_xX are futile. Your life as
>it has been is over ( if you hope to pass ) From this time forward, you will
>study US!
>( apologies to the folks at Star Trek TNG )
>
>_
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Re: Another CCNP joins the ranks!
Congratulations! Murphy
Now on to CCDP or CCIE written?
For now, why don't you get some rest, I believe you deserve it!!
Regards,
Jaeheon
On 7 Jan 2001 01:23:58 -0500, [EMAIL PROTECTED] ("G.E. Murphy") wrote:
>Passed CIT today with a 759 at about 2:40 pm central time, to become
>CCNP..
>
>Lots of brain aching study has paid off. I must go now and kiss my wife
>and daughter and tell them how much I appreciate them being patient with
>me during my study track. Thanks and good luck to everybody!
>
>
>_
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Re: New router LSA created after full adjacency?
Hi, Scott. To monitor ospf adjancency or something like that, we usually have two routers connected to each other via Ethernet interfaces in a normal lab environment. In this case, before adjacency is built, old router LSA lists the Ethenet interface's network as Link Type 3 - "connection to a stub network" because no neighbor's found, but after adjacency built, new router LSA lists it as Link Type 2 - "connection to a transit network". You can check this with "show ip ospf database router" before and after ospf adjacency built. http://www.isi.edu/in-notes/rfc2328.txtpp.207-208 Hope this helps Regards Jaeheon On 10 Jan 2001 01:08:17 -0500, [EMAIL PROTECTED] (scott) wrote: >Dear OSPF gurus: > >I am probably missing a very basic point here as I am somewhat new to >OSPF. I have been debugging ospf adjacency, ospf events, ospf flood >plus some others. After routers become adjacent, the flooding process >starts. What I have noticed is that right after routers become >adjacent, they create a new router LSA and add one to the sequence >number. (The DR also sends out a network LSA.) > >My question is this: Does each router create this new instance of the >LSA to trigger the flooding process itself or is there some other reason >why a "new" LSA is created? *Why not just send out the original LSA to >begin the flooding process?* Doesn't sending out a new LSA cause >routers to recalculate their routing tables when, in fact, they just >calculated them moments ago when they became adjacent using the original >LSA? > >I understand the need for the flooding process. I don't understand the >need for a new LSA. > >Thanks in advance, > >Scott Chapin > >_ >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]
Re: access-list ?
Hi, Tony
I think it will permit only default routes.
Regards
Jaeheon
On 9 Jan 2001 19:38:00 -0500, [EMAIL PROTECTED] ("Tony van Ree")
wrote:
>Hi,
>
>I don't think it does much.
>
>I think it will permit all.
>
>Teunis
>Hobart, Tasmania
>Australia
>
>On Tuesday, January 09, 2001 at 02:52:09 PM, [EMAIL PROTECTED] wrote:
>
>> Hello,
>>
>> What does this access list do?
>>
>> neighbor ?.?.?.? route-map ? in
>> route-map ?-in permit 10
>> match ip address 5
>> access-list 5 permit 0.0.0.0
>>
>> Does it mean permit nothing, or does it mean permit default route? Or
>> am I way off? I think it's there to block
>> everything.
>>
>> Thank You,
>> Andre
>>
>> _
>> FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
>> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>>
>>
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Re: access-list ?
Hi, all
Well, this is from cisco site:
To specify a large number of individual addresses more easily, you can
omit the wildcard if it is all zeros. Thus, the following two
configuration commands are identical in effect:
access-list 2 permit 36.48.0.3
access-list 2 permit 36.48.0.3 0.0.0.0
That is,
access-list 2 permit 0.0.0.0 ---> "permit only defaults"
access-list 3 permit 0.0.0.0 255.255.255.255 ---> "permit all"
You can check it by yourself at:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/ip_r/iprprt1/1rdip.htm#xtocid124253
watch word wrap
Hope this helps,
Regards
Jaeheon
On 10 Jan 2001 05:10:03 -0500, [EMAIL PROTECTED] (suaveguru)
wrote:
>I also think it will permit all because in access-list
>we use wild card bits and 0.0.0.0 simply means
>255.255.255.255 which literally means permit all
>
>hope it helps
>
>suaveguru
>
>
>--- Jaeheon Yoo <[EMAIL PROTECTED]> wrote:
>> Hi, Tony
>>
>> I think it will permit only default routes.
>>
>> Regards
>>
>> Jaeheon
>>
>>
>>
>> On 9 Jan 2001 19:38:00 -0500, [EMAIL PROTECTED]
>> ("Tony van Ree")
>> wrote:
>>
>> >Hi,
>> >
>> >I don't think it does much.
>> >
>> >I think it will permit all.
>> >
>> >Teunis
>> >Hobart, Tasmania
>> >Australia
>> >
>> >On Tuesday, January 09, 2001 at 02:52:09 PM,
>> [EMAIL PROTECTED] wrote:
>> >
>> >> Hello,
>> >>
>> >> What does this access list do?
>> >>
>> >> neighbor ?.?.?.? route-map ? in
>> >> route-map ?-in permit 10
>> >> match ip address 5
>> >> access-list 5 permit 0.0.0.0
>> >>
>> >> Does it mean permit nothing, or does it mean
>> permit default route? Or
>> >> am I way off? I think it's there to block
>> >> everything.
>> >>
>> >> Thank You,
>> >> Andre
>> >>
>> >> _
>> >> 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]
>
>
>__
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>Yahoo! Photos - Share your holiday photos online!
>http://photos.yahoo.com/
>
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Re: cisco & muscles
Well, I'd better be contented with my 3 2501 routers in my home lab
until I get muscular and hairy enough to handle those monsters what is
called "7000"
On 10 Jan 2001 07:50:55 -0500, [EMAIL PROTECTED] ("Howard C. Berkowitz")
wrote:
>>No, and I don't have square hair either. &;-)
>>
>>Priscilla
>
>Square or not, you have more of it than I do.
>
>>
>>
>>At 09:11 PM 1/9/01, Ibrahim wrote:
>>
>>>If we see on Ciscopress book cover, there are always man with big muscles &
>>>strong.
>>>I'm working on CCIE .. and muscles :-) Anyone here have CCIE plus big
>>>muscles ?
>>>
>>>
>>>Ibam
>> >ccnp+voice2.0
>> >
>
>Now, the REAL strength challenge was earthquake-mounting a 7000,
>which didn't have decent rack ears like the 7500. The usual practice
>took three strong individuals, one of whom wasn't terribly attached
>to his or her fingers.
>
>Take a 19" flat shelf and mount it in the rack, after drilling four
>holes that correspond the the positions of the rubber feet on the
>bottom of the 7000, and attaching a strap clamp to the shelf.
>
>Pick up the 7000 and unscrew the rubber feet, to find the screws underneath.
>
>With one person holding either side of the 7000, have the third crazy
>person slide a hand underneath the router and guide its bottom screws
>into the holes in the shelf.
>
>Fasten nuts on the screws from underneath the shelf. Tighten the strap clamp.
>
>_
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Re: access-list ?
Hi, Tony.
I'm not sure I understand correctly what you're trying to say.
But I'd like to point out this:
In this case, access-lists are not used as filters for incoming or
outgoing data packets, but they are used here as filters for incoming
or outgoing routing updates. More specifically, for route entries
contained in routing update pactets.
So default route entry is just one entry here.
Hope this helps
Regards
Jaeheon
On 10 Jan 2001 18:15:43 -0500, [EMAIL PROTECTED] ("Tony van Ree")
wrote:
>Hi,
>
>I must be missing the point.
>
>I thought a default route was telling the device go here for all routes I don't know
>about. Does that not imply any not excluded and the access-list as I understand it
>does not exclude any until the perfit default which I would take to read permit any.
>
>Teunis
>Hobart, Tasmania
>Australia
>
>
>On Wednesday, January 10, 2001 at 01:02:18 AM, suaveguru wrote:
>
>> I also think it will permit all because in access-list
>> we use wild card bits and 0.0.0.0 simply means
>> 255.255.255.255 which literally means permit all
>>
>> hope it helps
>>
>> suaveguru
>>
>>
>> --- Jaeheon Yoo <[EMAIL PROTECTED]> wrote:
>> > Hi, Tony
>> >
>> > I think it will permit only default routes.
>> >
>> > Regards
>> >
>> > Jaeheon
>> >
>> >
>> >
>> > On 9 Jan 2001 19:38:00 -0500, [EMAIL PROTECTED]
>> > ("Tony van Ree")
>> > wrote:
>> >
>> > >Hi,
>> > >
>> > >I don't think it does much.
>> > >
>> > >I think it will permit all.
>> > >
>> > >Teunis
>> > >Hobart, Tasmania
>> > >Australia
>> > >
>> > >On Tuesday, January 09, 2001 at 02:52:09 PM,
>> > [EMAIL PROTECTED] wrote:
>> > >
>> > >> Hello,
>> > >>
>> > >> What does this access list do?
>> > >>
>> > >> neighbor ?.?.?.? route-map ? in
>> > >> route-map ?-in permit 10
>> > >> match ip address 5
>> > >> access-list 5 permit 0.0.0.0
>> > >>
>> > >> Does it mean permit nothing, or does it mean
>> > permit default route? Or
>> > >> am I way off? I think it's there to block
>> > >> everything.
>> > >>
>> > >> Thank You,
>> > >> Andre
>> > >>
>> > >> _
>> > >> 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! Photos - Share your holiday photos online!
>> http://photos.yahoo.com/
>>
>> _
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>> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>>
>>
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RFC 1771 - Update message NRI
Hi, all Now I'm reviewing BGP 4 for the upcoming BSCN test. I'm getting nervous about it. In p.17 of RFC1771, what does "one route" mean? What's the difference between one route and one destination? Or should "route" be replaced with "path" as is used in BSCN book? An UPDATE message can advertise at most one route, which may be described by several path attributes. All path attributes contained in a given UPDATE messages apply to the destinations carried in the Network Layer Reachability Information field of the UPDATE message. But in the next paragraph, "route" is used as "destination". An UPDATE message can list multiple routes to be withdrawn from service. Each such route is identified by its destination (expressed as an IP prefix), which unambiguously identifies the route in the context of the BGP speaker - BGP speaker connection to which it has been previously been advertised. I hope somebody out there will clarify this to me. Thanks in advance. Jaeheon _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: CCIE written, 2nd try
Good luck! You can do it! Jaeheon On 10 Jan 2001 22:56:53 -0500, [EMAIL PROTECTED] (Jim Healis) wrote: >Well, in just about 12 hours I take the CCIE written exam for the second >time. The first time was just to get a handle on what I should expect >(though I still held hope that I would pass). >This time, however, I have made a strong effort to study. In the last >four weeks I have read more material, page for page, than I did all >through college. I still can't say that I know it all because sometimes >I still draw a blank when someone asks me a question. But I can say that >when I took that first Certification Zone practice exam I thought I was >nuts for thinking I could do this, and when I took the most recent one I >actually made a passing score. >And now, on the eve of my exam, I think to myself if I am still crazy >for continuing this path. I mean, thinking about all that I must study >in addition to what I have already done makes me dizzy. But just for >giggles I thought I would see how fast I could correctly configure a >router, from scratch, with two Ethernet connections, two WAN >connections, a routing protocol and NAT. Now I know this is a simple >configuration but I was going for speed not complexity. I finished >configuring the router in just under 9 minutes, and yes, it worked! I >was shocked. I didn't think I was that practiced. >So now I study a bit more, just to cover the basic items that I may have >forgotten in my studies. I also plan on getting a good night's sleep >(though I may be too nervous). And tomorrow morning I plan on passing >the exam and greeting my future with open arms and a confident smirk on >my face. :-) > >Best wishes to all! > >Jim > >_ >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]
Passive-interface in OSPF
Hi, in p.463 of Building Scalable Cisco Networks --- During testing with debug commands, it was found that OSPF does send Hello and DBD packets on passive interfaces, but does not send LSUs. EIGRP does not send anything on passive interfaces. - I tested it by myself, Yes, it is true when you believe what the debugger says, "debug ip packet" reports it's sending hellos on a passive interface, But on the other end, the same "debug ip packet" says no hellos from the passive interface are received. So what's going on here? I still firmly believe no hellos are sent on a passive interface. Then is it a BUG in IOS? Thanks in advance. Jaeheon _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: RFC 1771 - Update message NRI
Thanks, Pete.
I think I'm beginning to get the picture.(routes are bundled under the
same path vector and path attributes , and in withdrawn routes prefix
length and prefixes are used just like unique keys)
But I need more reading on this after my BSCN test in about 10 hours.
Regards,
Jaeheon
On 11 Jan 2001 10:45:06 -0500, [EMAIL PROTECTED] ("Peter Van Oene")
wrote:
>Here is what I think about the wording below. They key thing to remember is that a
>withdrawn message does not need to carry as much information about a routes
>attributes as does an advertisement message. In both cases, a route describes a
>destination and a BGP Next_Hop address along with other attributes including as
>paths/communities/ etc. In the first case, the advertisement, single routes are
>noted with their full information provided such that the receiving peer can properly
>evaluate the route. However, for a withdrawn route, the receiver really only needs
>to know that the route is unreachable and thus, only the smallest piece of
>information which uniquely identifies the route, that being the destination prefix,
>is transmitted. Because withdraw advertisements transmit so little information about
>the route, and because what they do transmit is rather important for route stability,
>they are bundled together when transmitted.
>
>Does that clarify things a bit?
>
>Pete
>
>
>
>******* REPLY SEPARATOR ***
>
>On 1/10/2001 at 8:32 PM Jaeheon Yoo wrote:
>
>>Hi, all
>>
>>Now I'm reviewing BGP 4 for the upcoming BSCN test. I'm getting
>>nervous about it.
>>
>>In p.17 of RFC1771, what does "one route" mean? What's the difference
>>between one route and one destination? Or should "route" be replaced
>>with "path" as is used in BSCN book?
>>
>> An UPDATE message can advertise at most one route, which may be
>> described by several path attributes. All path attributes contained
>> in a given UPDATE messages apply to the destinations carried in the
>> Network Layer Reachability Information field of the UPDATE message
>
>
>>But in the next paragraph, "route" is used as "destination".
>>
>> An UPDATE message can list multiple routes to be withdrawn from
>> service. Each such route is identified by its destination
>>(expressed
>> as an IP prefix), which unambiguously identifies the route in the
>> context of the BGP speaker - BGP speaker connection to which it has
>> been previously been advertised.
>>
>>I hope somebody out there will clarify this to me.
>>Thanks in advance.
>>
>>Jaeheon
>>
>>_
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>
>
>
>_
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Passed BSCN!
Hi, all. I passed BSCN today with score 919. Thanks to the group members! Regards, Jaeheon _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Passed BSCN!
Hi, I took the test after 3 hours bus ride. This was my second for CCNP Cert. (first one was Switching 2.0) I was thinking I had prepared a lot, so I was confident before the test Total questions 61. allotted time 104 minutes, passing score 690 My score 919, time spent 65 minutes. In general, I'm satisfied with test and the results. But some of questions are still hard to understand what were right answers for them. First of all, the test follows the outline specified in Cisco site http://www.cisco.com/warp/public/10/wwtraining/certprog/testing/pdf/bscn.pdf In my case, I thought the test was evenly balanced between OSPF, EIGRP, BGP. Those three protocols were hugely questioned. Redistributions are covered a lot. And what I thought was tough was not individual protocol configuration, but their general features like this one. In BGP, what are the possible events caused when you have full mesh IBGP in your AS? What I prepared for the BSCN is as follows: 1. Building Scalable Cisco Networks , by Catherine Paquet I read it only once, but I should have read it at least twice. Most of Questions were from this book. And it is well written. 2. Routing TCP/IP, by Jeff Doyle I read it twice. For the second time, I just skipped ISIS part, which isn't covered in BSCN. 3. EIGRP Network Design Solutions, by Ivan Pepelnjak Just Once. I would like to recommend this, because it is very well written and there's no material on EIGRP than this. 4. Internet Routing Architectures, by Sam Halabi Twice, for the second, just flipped through it 5. OSPF Network Design Solutions, Thomas M. Thomas II Part of it. I don't want to recommend this. It's poorly written and contains many typos and hard to follow. 6. RFC 2328 - OSPF version 2 Well, I have to admit I'm still far from complete understanding of this protocol. Especially part 6. But after reading it greatly helps me understand "debug output". 7. Protocol Configuration Guide from Cisco site. 8. www.groupstudy.com, you know? This is the most valuable material of all. 9. several RFCs, including rfc1771, when I thought I need more research. 10. My own lab setup with three 2501 routers at home. I admit all of these may not be needed just to pass BSCN. But I have no field experience, I try to read widely. The type of questions is very much similar to other tests which I took. There's no fill-in, Instead you have to choose a large list of commands, some of which are not valid commands. Final tips just before the test, take a one more look at "show" and "debug" output. Thanks again to all group members. Now on to BCRAN. Regards, Jaeheon On 12 Jan 2001 12:05:07 -0500, [EMAIL PROTECTED] (Ole Drews Jensen) wrote: >Congratulations Jaeheon, that was a fine score. > >What did you use to prepare for this (books, routers, www, etc.)??? > >Thanks, > >Ole > > > Ole Drews Jensen > Systems Network Manager > CCNA, MCSE, MCP+I > RWR Enterprises, Inc. > [EMAIL PROTECTED] > http://www.oledrews.com/ccnp > > NEED A JOB ??? > http://www.oledrews.com/job > > > > >-Original Message- >From: Jaeheon Yoo [mailto:[EMAIL PROTECTED]] >Sent: Friday, January 12, 2001 9:25 AM >To: [EMAIL PROTECTED] >Subject: Passed BSCN! > > >Hi, all. > >I passed BSCN today with score 919. Thanks to the group members! > >Regards, >Jaeheon > >_ >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]
Re: Windows flow control & any questions
On 13 Jan 2001 02:12:04 -0500, [EMAIL PROTECTED] wrote: Hi, Park. My attempt is inline after my own research. >Hi, everyone... > >I'm park... > >I really can't find a correct answer the following questions; >if anybody have some idea, or answer or >please guide me > >1. In windows flow control, > window size 512, ack 38177, sequence 90708, byte sent 1024(A hosts) > window size 1024, ack 91732, sequence 38177, byte sent 512(B hosts) > window size 2048, ack ?, sequence ?, byte sent 1024(A hosts) Simple, ack 38689(38177 + 512) sequence 91732 > >2. What is true about UDP packet fragment? >1) Only first fragment has the UDP >2) All fragment hold UDP 1) is correct, only first one has the UDP header You can check p.151 of TCP/IP Illustrated, Volume 1: The Protocols > >3. TCP implementers when they talk about "slow start"? >1) adjust timers after detecting error >2) Keep tcp traffic from congestion >3) poor performance >4)bug >5) long latency > 2) is correct answer, slow start gradually increases segment sending rate, which causes congestion. "It operates by observing that the rate at which new packets should be injected into the network is the rate at which the acknowledgments are returned by the other end." Also from the same book, p.285, pp. 310 Wow, I came to realize that TCP/IP itself is a quite monster to master. And I'm far away from it. Thanks Regards, Jaeheon > > > > > > >_ >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]
Re: OT: Fridays funnies -- Woman's Dictionary
Hi, Natasha I have to admit I'm your fan. You're a gem for this list. Thanks!! Jaeheon On 12 Jan 2001 19:25:18 -0500, [EMAIL PROTECTED] (Natasha) wrote: >Airhead (er*hed) n. What a woman intentionally becomes, when pulled over >by a policeman. > > Argument (ar*gyou*ment) n. A discussion that occurs, when you're >right, but he just hasn't > realized it yet. > > Balance the checkbook (bal*ens da chek*buk) v. To go to the cash >machine and hit > "inquire". > > Bar-be-que (bar*bi*q) n. You bought the groceries, washed the lettuce, >chopped the > tomatoes, diced the onions, marinated the meat, and cleaned everything >up, but he > "made the dinner". > > Blonde jokes (blond joks) n. Jokes that are short so men can >understand them. > > Cantaloupe (kant*e*lope) n. Gotta get married in a church. > > Clothes dryer (kloze dri*yer) n. An appliance designed to eat socks. > > Diet Soda (dy*it so*da) n. A drink you buy at a convenience store to >go with a pound of > M&M chocolate covered peanuts. > > Eternity (e*ter*ni*tee) n. The last two minutes of a football game. > > Exercise (ex*er*siz) v. To walk up and down a mall, occasionally >resting to make a > purchase. > > Grocery List (grow*ser*ee list) n. What you spend half an hour >writing, then forget to take > with you to the store. > > Hair Dresser (hare dres*er) n. Someone, who is able to create a style, >you will never be > able to duplicate again. See also "Magician". > > Hardware Store (hard*war stor) n. Similar to a black hole in >space...if he goes in, he isn't > coming out anytime soon. > > Childbirth (child*brth) n. You get to go through 36 hours of >contractions; he gets to hold > your hand and say, > "Focus...breath...push...Good Girl!" > > Lipstick (lip*stik) n. On your lips, coloring to enhance the beauty of >your mouth. On his > collar, coloring only a tramp would wear. > > Park (park) v./n. Before children, a verb meaning, "to go somewhere >and neck". After > children, a noun meaning a place with a swing set and slide. > > Patience (pa*shens) n. The most important ingredient for dating, >marriage and children. > See also "tranquilizers". > > Valentine's Day (val*en*tinez dae) n. A day ,when you have dreams of a >candlelight > dinner, diamonds, and romance, but consider yourself lucky to get a >card. > > Waterproof Mascara (wah*tr*pruf mas*kar*ah) n. Comes off if you cry, >shower, or swim, > but will not come off, if you try to remove it. > > Zillion (zil*yen) n. The number of times you ask someone to take out >the trash, then end up > doing it yourself anyway > >Natasha Flazynski >http://www.ciscobot.com >My Cisco information site. >http://www.botbuilders.com >Artificial Intelligence and Linux development > >A bus station is where a bus stops. >A train station is where a train stops. >On my desk, I have a work station... > >_ >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]
Re: Redundant BGP Route Reflector Peers
Hi, Jeff
I think one thing might cause the trouble.
1. "ebgp-multihop" should not be used between iBGP peers.
Multihops between iBGP peers are always allowed.
Thanks
Regards,
Jaeheon
On 13 Jan 2001 17:22:02 -0500, [EMAIL PROTECTED] ("Horton, Jeff")
wrote:
>Hello all,
>
>I was trying to build a BGP scenario in the lab where I had two routers, R1
>& R2 that are both route reflectors. R3, R4, and R5 are route-reflector
>clients. R1 and R2 are both in cluster ID 100. Peer groups are set up for
>both route reflectors and route reflector clients. The idea was that should
>R1 or R2 fail, the routes would still be reflected to the clients. R1 and R2
>are able to ping R3, R4, and R5 just fine.
>
>Loopbacks are 1.1.1.1, 2.2.2.2, 3.3.3.3, etc. On RR clients R3 , R4, and R5
>I also have 30.30.30.3, 40.40.40.4, 50.50.50.5 that are advertised in BGP. I
>seem to have mixed results and I am not quite sure where I have gone wrong.
>R3 routes seem to be reflected but not R4 or R5.
>
>I would appreciate suggestions.
>
>Thanks,
>
>Jeff
>
>R1
>router ospf 1
> network 1.1.1.0 0.0.0.255 area 0
> network 172.168.14.0 0.0.0.255 area 0
> network 172.168.125.0 0.0.0.255 area 0
>!
>router bgp 1
> no synchronization
> bgp cluster-id 100
> neighbor reflectors peer-group
> neighbor reflectors remote-as 1
> neighbor reflectors update-source Loopback0
> neighbor clients peer-group
> neighbor clients remote-as 1
> neighbor clients ebgp-multihop 255
> neighbor clients update-source Loopback0
> neighbor clients route-reflector-client
> neighbor 2.2.2.2 peer-group reflectors
> neighbor 3.3.3.3 peer-group clients
> neighbor 4.4.4.4 peer-group clients
> neighbor 5.5.5.5 peer-group clients
> no auto-summary
>!
>
>R2
>router ospf 1
> network 2.2.2.0 0.0.0.255 area 0
> network 172.168.125.0 0.0.0.255 area 0
>!
>router bgp 1
> no synchronization
> bgp cluster-id 100
> neighbor clients peer-group
> neighbor clients remote-as 1
> neighbor clients update-source Loopback0
> neighbor clients route-reflector-client
> neighbor reflectors peer-group
> neighbor reflectors remote-as 1
> neighbor reflectors update-source Loopback0
> neighbor 1.1.1.1 peer-group reflectors
> neighbor 3.3.3.3 peer-group clients
> neighbor 4.4.4.4 peer-group clients
> neighbor 5.5.5.5 peer-group clients
> no auto-summary
>!
>
>R3
>router ospf 1
> network 3.3.3.0 0.0.0.255 area 0
> network 192.168.23.0 0.0.0.255 area 0
>!
>router bgp 1
> no synchronization
> network 3.3.3.0 mask 255.255.255.0
> network 30.30.30.0 mask 255.255.255.0
> neighbor 1.1.1.1 remote-as 1
> neighbor 1.1.1.1 update-source Loopback0
> neighbor 1.1.1.1 next-hop-self
> neighbor 2.2.2.2 remote-as 1
> neighbor 2.2.2.2 update-source Loopback0
> neighbor 2.2.2.2 next-hop-self
> no auto-summary
>
>R4
>router ospf 1
> network 4.4.4.0 0.0.0.255 area 0
> network 172.168.14.0 0.0.0.255 area 0
> network 192.168.23.0 0.0.0.255 area 0
>!
>router bgp 1
> no synchronization
> network 4.4.4.0 mask 255.255.255.0
> network 40.40.40.4 mask 255.255.255.0
> neighbor 1.1.1.1 remote-as 1
> neighbor 1.1.1.1 update-source Loopback0
> neighbor 1.1.1.1 next-hop-self
> neighbor 2.2.2.2 remote-as 1
> neighbor 2.2.2.2 update-source Loopback0
> neighbor 2.2.2.2 next-hop-self
> no auto-summary
>
>R5
>router ospf 1
> network 5.5.5.0 0.0.0.255 area 0
> network 172.168.125.0 0.0.0.255 area 0
>!
>router bgp 1
> no synchronization
> network 5.5.5.0 mask 255.255.255.0
> network 50.50.50.0 mask 255.255.255.0
> neighbor 1.1.1.1 remote-as 1
> neighbor 1.1.1.1 update-source Loopback0
> neighbor 1.1.1.1 next-hop-self
> neighbor 2.2.2.2 remote-as 1
> neighbor 2.2.2.2 update-source Loopback0
> neighbor 2.2.2.2 next-hop-self
> no auto-summary
>
>
>
>_
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Re: Frame Relay...Inverse-Arp..?
Hi, Tayler. Quite Odd, it's contrary to what I have read through cisco web site. I guess it may only work in a lab where a cisco router's configured as a Frame relay switch. I would like to take a look at your configuration, if you don't mind. Thanks Regards, Jaeheon - Original Message - From: "Nigel Taylor" <[EMAIL PROTECTED]> To: "Cisco Group Study" <[EMAIL PROTECTED]>; "Chuck Larrieu" <[EMAIL PROTECTED]>; "CCIE_Lab Group Study" <[EMAIL PROTECTED]> Sent: Sunday, January 14, 2001 9:47 PM Subject: Frame Relay...Inverse-Arp..? > > Hi All, > I was working through a number of frame relay lab and made = > some pretty cool observations. The big one being that I had Inverse-Arp = > working as well while using the "frame-map" command. Everything I know = > tells me this shouldn't be but it works. > I reloaded the routers and the Inverse arp worked. Even after shutting = > down the interface and bringing it back up the Inverse-Arp still worked. = > =20 > > Anyone got any thoughts on how this could be working? > > Nigel... > > > _ > 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]
R-45 to R-45 Null modem cable pinouts for Router AUX to AUX
Hi Friends I am trying to connect two 2501 routers via their AUX ports so that I can simulate DDR. Could someone send me the cable pinouts or guide me to proper web page.. I spent quite a long time looking in the archieves but didnt find the info. Please help . Thanks Jaeheon _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Passed Support 2.0
Congratulations!!
I'm planning to sit for this in about 2 weeks.
I hope that test will complete my CCNP.
Thanks for your encouragement.
And good luck to your upcoming CCIE written and lab.
Regards,
Jaeheon
On 22 Jan 2001 11:10:09 -0500, [EMAIL PROTECTED]
("william") wrote:
>Hi guys
>
>Just passed it today. The questions are not difficult but tricky. What I
>said is funny questions. Really. I thought that it is the most difficult
>module. Believe me, if you have passed BSCN, BCMSN and BCRAN, you will have
>no problem with this exam. I had few Apple Talk questions. Quiet a lot.
>About 5 of them.
>
>For those who are working on this, good luck.
>
>And thanks guys for your input here.
>
>I'm on my way to CCIE.
>
>
>Best regards.
>
>
>William Wong
>
>
>_
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OSPF vs. IS-IS
Which one is more widely deployed, OSPF or IS-IS? _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: ISDN BRI up but does not ping [7:2712]
Hi, Shoaib.
First of all, you have to check if the ping packet is ever received by
the remote end, is it possible to "debug ip packet" at the remote end?
If it's not possible, check it at the center site with this.
access-list 110 permit ip 130.1.1.0 0.0.0.255 130.1.1.0 0.0.0.255
debug ip packet detail 110
If it's ever really sent to the remote end, then check if your isdn
interface of the remote end has any access-lists configured, which may
block return ping(echo reply) or any policy routing on that matter.
>From your post, I have found nothing wrong with ISDN configuration.
But one thing is missing at the remote end, you have to add
dialer-group command to reset idle timer when interesting packets are
passed. But I guess this is not directly related to your current
problem.
Please let me know how you solved the problem, if it's done.
Regards,
Jaeheon
On 1 May 2001 14:43:19 -0400, [EMAIL PROTECTED] ("Shoaib Waqar")
wrote:
>I have traced the route as well, the data is not
>passing across the ISDN link.
>
>I also have used extended ping, but it does not ping.
>
>Shoaib
>
>--- Albert Lu wrote:
>> Do you know whether data is going across the link at
>> all?
>>
>> Try a trace to the other side, and see what route
>> the packet takes.
>>
>>
>> Albert
>>
>> > -Original Message-
>> > From: Shoaib Waqar [mailto:[EMAIL PROTECTED]]
>> > Sent: Tuesday, 1 May 2001 10:15
>> > To: Albert lu
>> > Cc: [EMAIL PROTECTED]
>> > Subject: RE: ISDN BRI up but does not ping
>> [7:2712]
>> >
>> >
>> > Yes i also have used an access-list to prevent
>> eigrp
>> > to initiate call, and it dials on a ping event, as
>> > shown by the 'deb dialer events'
>> >
>> > shoaib
>> >
>> >
>> > --- Albert Lu wrote:
>> > > Try using debug dialer events to see if the
>> dialing
>> > > actually takes place
>> > > when you ping. If the dialer doesn't come up,
>> then
>> > > it could be a dialer
>> > > problem. If it does come up, and dialing fails,
>> then
>> > > it could be an isdn
>> > > problem.
>> > >
>> > > Albert
>> > >
>> > > > -Original Message-
>> > > > From: Shoaib Waqar
>> [mailto:[EMAIL PROTECTED]]
>> > > > Sent: Tuesday, 1 May 2001 9:54
>> > > > To: Albert lu
>> > > > Cc: [EMAIL PROTECTED]
>> > > > Subject: RE: ISDN BRI up but does not ping
>> > > [7:2712]
>> > > >
>> > > >
>> > > > I have tried dialer profiles, legacy DDR with
>> > > dialer
>> > > > mao statement and with floating static route
>> too,
>> > > but
>> > > > still same result, could not ping the
>> neighbor.
>> > > > Offcourse there is a dialer-list statement to
>> > > initiate
>> > > > call:
>> > > >
>> > > > dialer-list 1 protocol ip permit
>> > > >
>> > > > Shoaib
>> > > >
>> > > >
>> > > >
>> > > > --- Albert Lu wrote:
>> > > > > I personally think that using dialer
>> profiles
>> > > are
>> > > > > better than hard coding
>> > > > > the interface. It is also true that there is
>> no
>> > > > > dialer-list command to dial
>> > > > > for interesting traffic, and you don't have
>> a
>> > > route
>> > > > > to use the bri interface
>> > > > > so it wouldn't know when to dial.
>> > > > >
>> > > > > Wouldn't you need a dialer map command for
>> > > > > interfaces, rather than specify
>> > > > > dialer string?
>> > > > >
>> > > > > Albert
>> > > > >
>> > > > > > -Original Message-
>> > > > > > From: [EMAIL PROTECTED]
>> > > > > [mailto:[EMAIL PROTECTED]]On Behalf Of
>> > > > > > Shoaib Waqar
>> > > > > > Sent: Tuesday, 1 May 2001 6:15
>> > > > > > To: [EMAIL PROTECTED]
>> > > > > > Subject: ISDN BRI up but does not ping
>> > > [7:2712]
>> > > > > >
>> > > > > >
>> > > > > > I am getting trouble in ISDN bri link. I
>> have
>> > > a
>> > > > > > Central site Router 3640 with 12.1.8
>> IP/IPX
>> > > plus
>> > > > > IOS.
>> > > > > > the route has 4 port BRI module. The
>> remote
>> > > site
>> > > > > is
>> > > > > > having 2503, all u know that it has 1 port
>> > > BRI.
>> > > > > remote
>> > > > > > site is running 11.2.1 version of IOS. The
>> > > call is
>> > > > > > placed using simple DDR commands as:
>> > > > > >
>> > > > > > Cisco 3640 Router
>> > > > > > =
>> > > > > > Int bri 2/0
>> > > > > > ip add 130.1.1.1 255.255.255.0
>> > > > > > encap ppp
>> > > > > > dialer idle-timeout 300
>> > > > > > dialer fast-idle 300
>> > > > > > dialer string
>> > > > > > dialer-group 1
>> > > > > >
>> > > > > > Remote site (2503):
>> > > > > > ===
>> > > > > >
>> > > > > > Int bri 0
>> > > > > > ip add 130.1.1.2 255.255.255.0
>> > > > > > encap ppp
>> > > > > > dialer idle-timeout 300
>> > > > > > dialer fast-idle 300
>> > > > > >
>> > > > > > In this scenario, a/c to customer need,
>> the
>> > > > > central
>> > > > > > site is placing call.When the call has
>> placed,
>> > > and
>> > > > > we
>> > > > > > see the debug output, it shows all the
>> debug
>> > > of
>> > > > > ppp
>> > > > > > negotiations and ISDN events as correct,
>> with
>> > > the
>> > > > > > install route at the end. When i
Re: ISDN BRI up but does not ping [7:2712]
Hi, Jim
My understanding is dialer-group statement does NOT block any packets
while the connection is established up.
What it does is;
1. define interesting traffic to initiate the call
2. reset the idle timers when interesting traffic is pass through
established connection.
Please correct me if I'm wrong.
Regards,
Jaeheon
On 1 May 2001 18:14:48 -0400, [EMAIL PROTECTED] ("Jim Brown")
wrote:
>I scanned the message and noticed the configs at the bottom.
>
>You only applied a dialer-group on the dialing end. My testing and
>observation determined that you need a dialer-group statement on the remote
>end also.
>
>If you do not define any interesting traffic for the remote end it will not
>send any packets back to the host that initiated the call.
>
>I always assumed you only needed to define interesting traffic to initiate a
>call, so why would I need the dialer-group statement on the remote end?
>
>When initially goofing around with ISDN I noticed this behavior. I could not
>find it documented anywhere. I just assumed if the connection is up why do I
>need to define interesting traffic for the remote end. This drove me crazy
>for a few hours.
>
>List, please correct me if I'm crazy. I noticed this behavior with 12.0 IOS.
>
>-Original Message-
>From: Jaeheon Yoo [mailto:[EMAIL PROTECTED]]
>Sent: Tuesday, May 01, 2001 3:57 PM
>To: [EMAIL PROTECTED]
>Subject: Re: ISDN BRI up but does not ping [7:2712]
>
>
>Hi, Shoaib.
>
>First of all, you have to check if the ping packet is ever received by
>the remote end, is it possible to "debug ip packet" at the remote end?
>If it's not possible, check it at the center site with this.
>
>access-list 110 permit ip 130.1.1.0 0.0.0.255 130.1.1.0 0.0.0.255
>debug ip packet detail 110
>
>If it's ever really sent to the remote end, then check if your isdn
>interface of the remote end has any access-lists configured, which may
>block return ping(echo reply) or any policy routing on that matter.
>
>From your post, I have found nothing wrong with ISDN configuration.
>But one thing is missing at the remote end, you have to add
>dialer-group command to reset idle timer when interesting packets are
>passed. But I guess this is not directly related to your current
>problem.
>
>Please let me know how you solved the problem, if it's done.
>
>Regards,
>Jaeheon
>
>On 1 May 2001 14:43:19 -0400, [EMAIL PROTECTED] ("Shoaib Waqar")
>wrote:
>
>>I have traced the route as well, the data is not
>>passing across the ISDN link.
>>
>>I also have used extended ping, but it does not ping.
>>
>>Shoaib
>>
>>--- Albert Lu wrote:
>>> Do you know whether data is going across the link at
>>> all?
>>>
>>> Try a trace to the other side, and see what route
>>> the packet takes.
>>>
>>>
>>> Albert
>>>
>>> > -Original Message-
>>> > From: Shoaib Waqar [mailto:[EMAIL PROTECTED]]
>>> > Sent: Tuesday, 1 May 2001 10:15
>>> > To: Albert lu
>>> > Cc: [EMAIL PROTECTED]
>>> > Subject: RE: ISDN BRI up but does not ping
>>> [7:2712]
>>> >
>>> >
>>> > Yes i also have used an access-list to prevent
>>> eigrp
>>> > to initiate call, and it dials on a ping event, as
>>> > shown by the 'deb dialer events'
>>> >
>>> > shoaib
>>> >
>>> >
>>> > --- Albert Lu wrote:
>>> > > Try using debug dialer events to see if the
>>> dialing
>>> > > actually takes place
>>> > > when you ping. If the dialer doesn't come up,
>>> then
>>> > > it could be a dialer
>>> > > problem. If it does come up, and dialing fails,
>>> then
>>> > > it could be an isdn
>>> > > problem.
>>> > >
>>> > > Albert
>>> > >
>>> > > > -Original Message-
>>> > > > From: Shoaib Waqar
>>> [mailto:[EMAIL PROTECTED]]
>>> > > > Sent: Tuesday, 1 May 2001 9:54
>>> > > > To: Albert lu
>>> > > > Cc: [EMAIL PROTECTED]
>>> > > > Subject: RE: ISDN BRI up but does not ping
>>> > > [7:2712]
>>> > > >
>>> > > >
>>> > > > I have tried dialer profiles, legacy DDR with
>>> > > dialer
>>> > > > mao statement and with floating static route
>>> too,
>>> > > but
>>> &g
Choosing among multiple intra-area ASBR routers [7:5416]
Hi, all According to rfc2328. p.175, when we have multiple intra-area paths to ASBR,a intra-area path using non-backbone area should be chosen over one using backbone area. But I always have opposite result. doesn't Cisco's implementation yet conform to rfc2328 in this respect? Here's from my cisco 2501 router. r2#sh ip ospf data -omitted Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 131.108.0.0 192.168.40.3324 0x8003 0xE930 0 r2# r2#sh ip ospf border OSPF Process 10 internal Routing Table Codes: i - Intra-area route, I - Inter-area route i 192.168.40.3 [74] via 172.16.2.2, Serial0, ABR/ASBR, Area 0, SPF 7 i 192.168.40.3 [1562] via 172.16.30.33, Serial1, ABR/ASBR, Area 6, SPF 5 r2#sh ip route -omitted O E2 131.108.0.0/16 [110/20] via 172.16.2.2, 00:03:38, Serial0 r2# Could somebody explain this to me? Thanks in advance. Regards, Jaeheon Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=5416&t=5416 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Choosing among multiple intra-area ASBR routers [7:5416]
Hi, Erick
Thanks for your kind reply again.
But it is a different story.
I guess I know what you're trying to say.
Have you really read the page 175 yourself.
If you read it, you would know what I'm curious about.
This is about multiple intra-area paths to ASBR.
Please refer to "OSPF Complete Implementation", p.223
It says that:
"... , paths through nonbackbone areas area preferred over paths
through the backbone area 0.0.0.0. When multiple preferred paths are
available, the one with the smallest cost is used."
But in Cisco routers with IOS 12.0, we have different result.
it seems to conform to rfc 1583.
Hope somebody can clarify this for me.
Regards,
Jaeheon
On 22 May 2001 08:55:46 -0400, [EMAIL PROTECTED] ("Erick B.") wrote:
>Did you get my response to your original post?
>
>The route on r2 is a E2 route so it is not intra-area,
>but a externally learned route so different rules come
>into play. With external routes, there is a forwarding
>address (next-hop value) of the lowest cost route to
>that destination. Look at the RFC again - pages 23-25
>or so, the section dealing with external routes. They
>explain it there well and have an example.
>
>--- Jaeheon Yoo wrote:
>> Hi, all
>> According to rfc2328. p.175, when we have multiple
>> intra-area paths to
>> ASBR,a intra-area path using non-backbone area
>> should be chosen over
>> one using backbone area.
>> But I always have opposite result. doesn't Cisco's
>> implementation yet
>> conform to rfc2328 in this respect?
>>
>> Here's from my cisco 2501 router.
>>
>> r2#sh ip ospf data
>>
>-omitted
>>Type-5 AS External Link States
>>
>> Link ID ADV Router Age Seq#
>> Checksum Tag
>> 131.108.0.0 192.168.40.3324
>> 0x8003 0xE930 0
>> r2#
>> r2#sh ip ospf border
>>
>> OSPF Process 10 internal Routing Table
>>
>> Codes: i - Intra-area route, I - Inter-area route
>>
>> i 192.168.40.3 [74] via 172.16.2.2, Serial0,
>> ABR/ASBR, Area 0, SPF 7
>> i 192.168.40.3 [1562] via 172.16.30.33, Serial1,
>> ABR/ASBR, Area 6, SPF
>> 5
>>
>> r2#sh ip route
>> -omitted
>> O E2 131.108.0.0/16 [110/20] via 172.16.2.2,
>> 00:03:38, Serial0
>> r2#
>>
>> Could somebody explain this to me?
>> Thanks in advance.
>
>
>
>__
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What PC OS does support Mobile IP(rfc2002)? [7:5878]
Hi, all I've just finished reading rfc2002, "Mobile IP".(Although its real title for that rfc is "IP Mobility Support".) I would like to do some labs on "Mobile IP" with cisco routers. Is there any Operating System supporting Mobile IP out there? Actually, any version of Windows would be better for me. Thanks in advance. Regards, Jaeheon Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=5878&t=5878 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Cisco OSPF ABR Implementations [7:28868]
Hi, all I believe you have already read this RFC draft. But for those who have missed this important material, I'd like to share this with you. It will clarify somewhat tricky Cisco ABR behavior. http://www.ietf.org/internet-drafts/draft-ietf-ospf-abr-alt-04.txt Hope this helps. Regards Jaeheon Yoo Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=28868&t=28868 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
