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-----Original Message-----
From: [email protected]
Sender: [email protected]
Date: Mon, 28 Mar 2011 09:29:22
To: <[email protected]>
Reply-to: [email protected]
Subject: CCIE_RS Digest, Vol 62, Issue 72
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Today's Topics:
1. Re: redundant DHCP_OFFER and DHCP_REQUEST provisioning in IOS
(Michal Styszynski)
2. ICMP type:3, code:3, Destination port unreachable
(Malik Nouman Ahmad)
3. MPLS LDP PASSWORD OPTION (marc abel)
4. Re: MPLS LDP PASSWORD OPTION (Rob Pool)
5. Re: MPLS LDP PASSWORD OPTION (Matt Hill)
6. A Router as a DHCP server (Ahmed Haji Munye)
7. Re: MPLS LDP PASSWORD OPTION (marc abel)
----------------------------------------------------------------------
Message: 1
Date: Sun, 27 Mar 2011 15:54:28 -0700 (PDT)
From: Michal Styszynski <[email protected]>
To: [email protected]
Subject: Re: [OSL | CCIE_RS] redundant DHCP_OFFER and DHCP_REQUEST
provisioning in IOS
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
hello Dave and Dale ,
thanks for the follow-up and so the order of helper-addresses counts for the
discovery/request.
Looking at the standard dhcp client-server packet flow I think we could put the
inbound ACL under the router interface that filter the source IP of the dhcp
server with the UDP port eq 67 but didn't try it yet.
Thanks for your feedbacks again.
Cheers ,
Michal
________________________________
From: Dave Blank <[email protected]>
To: Michal Styszynski <[email protected]>
Cc: [email protected]
Sent: Sun, March 27, 2011 1:37:23 AM
Subject: Re: [OSL | CCIE_RS] redundant DHCP_OFFER and DHCP_REQUEST provisioning
in IOS
From:
http://www.cisco.com/en/US/partner/docs/ios/ipaddr/configuration/guide/iad_dhcp_client_ps6441_TSD_Products_Configuration_Guide_Chapter.html"A
DHCP client may receive offers from multiple DHCP servers and can accept any
one of the offers; however, the client usually accepts the first offer it
receives. Additionally, the offer from the DHCP server is not a guarantee that
the IP address will be allocated to the client; however, the server usually
reserves the address until the client has had a chance to formally request the
address."
You are correct... the IOS DHCP client will just send a DHCP_REQUEST to the
first DHCP_OFFER it gets. Not possible to change this behavior (unless I'm
missing something, which is always possible). This is assuming the DHCP
servers
are on the same segment.
The "ip helper-address" command will determine which servers the requests are
forwarded to in the first place, so you have some control over where the
requests get forwarded if the servers are on a different subnet. You could
also
configure authentication of the DHCP request using "ip dhcp client
authentication key-chain" and "ip dhcp client authentication mode" with the
same
config on the server.
-Dave
On Sat, Mar 26, 2011 at 12:46 PM, Michal Styszynski <[email protected]>
wrote:
Dear students ,
>
>
>I was just looking for some information on the easiest form of how in IOS12.4t
>the dhcp client ( router interface ) could select between two ( or more )
>redundant DHCP_OFFER messages received from different DHCP servers i.e. how it
>could be provisioned to send then the DHCP_REQUEST to just one of the servers
>without filtering inbound the DHCP_OFFER from one of the servers. Is the
request
>sent just to the server which sent first the OFFER ? Thanks for any follow-ups
>!
>Michal
>
>
>
>_______________________________________________
>For more information regarding industry leading CCIE Lab training, please
>visit
>www.ipexpert.com
>
------------------------------
Message: 2
Date: Mon, 28 Mar 2011 03:00:47 +0300
From: Malik Nouman Ahmad <[email protected]>
To: Cisco certification <[email protected]>, ccie_rs
<[email protected]>
Subject: [OSL | CCIE_RS] ICMP type:3, code:3, Destination port
unreachable
Message-ID:
<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
Hi guys,
I have built a network on GNS3 and have simulated PC using VPCS (
http://www.freecode.com.cn/doku.php?id=wiki:vpcs).
While doing a traceroute I have got the following output:
VPCS[2]> tracert 23.23.23.1
traceroute to 23.23.23.1, 64 hops max, press Ctrl+C to stop
1 10.177.160.2 63.000 ms 47.000 ms 46.000 ms
2 10.177.162.9 218.000 ms 94.000 ms 78.000 ms
3 10.177.162.2 171.000 ms 125.000 ms 110.000 ms
4 62.190.99.1 156.000 ms 156.000 ms 156.000 ms
5 *144.123.20.9 265.000 ms (ICMP type:3, code:3, Destination port
unreachable)
The trace is correct and the IP address (23.23.23.1/24) is in fact a
loopback on the same router which is on hop 5.
I am trying to understand as to why I am getting "Destination port
unreachable" and how can it be fixed
Regards,
Malik
------------------------------
Message: 3
Date: Sun, 27 Mar 2011 21:31:35 -0500
From: marc abel <[email protected]>
To: [email protected]
Subject: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
Message-ID:
<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
Working through Vol 3 lab 1 and task 2.5 shows them enter the command
mpls ldp password option 1 for 6 cisco
on my router I can't seem to enter that command
Version 12.4(15)T14
R6(config)#mpls ldp ?
advertise-labels Label advertisements
atm Configure ATM MPLS options
backoff Set LDP session backoff parameters
discovery LDP discovery
explicit-null Advertise Explicit Null label in place of Implicit Null
graceful-restart Configure LDP Graceful Restart
holdtime LDP session holdtime
igp Configure IGP-related LDP parameters
logging Enable LDP logging
loop-detection Enable LDP Loop Detection
maxhops Limit hop count for LDP LSP setup
neighbor Configure neighbor parameters
path-vector Path Vector for LDP LSP setup
request-labels Access list to specify valid downstream on demand
destinations.
router-id Select interface to prefer for LDP identifier address
session Configure session parameters
tcp Set TCP parameters for LDP
The doc cd shows it as a valid command. Any ideas?
Thanks,
Marc
------------------------------
Message: 4
Date: Sun, 27 Mar 2011 20:01:03 -0700 (PDT)
From: Rob Pool <[email protected]>
To: marc abel <[email protected]>, [email protected]
Subject: Re: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
Message-ID: <[email protected]>
Content-Type: text/plain; charset=iso-8859-1
I ran into the same exact task today and if I"m understanding correctly, our
routers aren't at a new enough code release. I"m running Version 12.4(11)T. I
copied the info below from the command reference. If I"m incorrect please let
me
know. Thanks.
12.4(20)T This command was integrated into Cisco?IOS Release 12.4(20)T.
12.4(20)T? This command was integrated into Cisco IOS Release 12.4(20)T.
12.4(20)T This command was integrated into Cisco?IOS Release 12.4(20)T.
12.4(20)T This command was integrated into Cisco?IOS Release 12.4(20)T.
12.4(20)T This command was integrated into Cisco?IOS Release 12.4(20)T.
________________________________
From: marc abel <[email protected]>
To: [email protected]
Sent: Sun, March 27, 2011 10:31:35 PM
Subject: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
Working through Vol 3 lab 1 and task 2.5 shows them enter the command
mpls ldp password option 1 for 6 cisco
on my router I can't seem to enter that command
Version 12.4(15)T14
R6(config)#mpls ldp ?
? advertise-labels? Label advertisements
? atm? ? ? ? ? ? ? Configure ATM MPLS options
? backoff? ? ? ? ? Set LDP session backoff parameters
? discovery? ? ? ? LDP discovery
? explicit-null? ? Advertise Explicit Null label in place of Implicit Null
? graceful-restart? Configure LDP Graceful Restart
? holdtime? ? ? ? ? LDP session holdtime
? igp? ? ? ? ? ? ? Configure IGP-related LDP parameters
? logging? ? ? ? ? Enable LDP logging
? loop-detection? ? Enable LDP Loop Detection
? maxhops? ? ? ? ? Limit hop count for LDP LSP setup
? neighbor? ? ? ? ? Configure neighbor parameters
? path-vector? ? ? Path Vector for LDP LSP setup
? request-labels? ? Access list to specify valid downstream on demand
? ? ? ? ? ? ? ? ? ? destinations.
? router-id? ? ? ? Select interface to prefer for LDP identifier address
? session? ? ? ? ? Configure session parameters
? tcp? ? ? ? ? ? ? Set TCP parameters for LDP
The doc cd shows it as a valid command. Any ideas?
Thanks,
Marc
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
------------------------------
Message: 5
Date: Mon, 28 Mar 2011 14:36:17 +1100
From: Matt Hill <[email protected]>
To: Rob Pool <[email protected]>
Cc: [email protected]
Subject: Re: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
Message-ID:
<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
I cant test this as I havent got a box in front of me to try..
However can you find anything under tag-switching as opposed to mpls?
That's the first place to look if something isnt there.
Cheers,
Matt
CCIE #22386
CCSI #31207
On 28 March 2011 14:01, Rob Pool <[email protected]> wrote:
> I ran into the same exact task today and if I"m understanding correctly, our
> routers aren't at a new enough code release. I"m running Version 12.4(11)T. I
> copied the info below from the command reference. If I"m incorrect please let
> me
> know. Thanks.
>
> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>
> 12.4(20)T? This command was integrated into Cisco IOS Release 12.4(20)T.
> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>
> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>
>
>
>
>
>
> ________________________________
> From: marc abel <[email protected]>
> To: [email protected]
> Sent: Sun, March 27, 2011 10:31:35 PM
> Subject: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
>
> Working through Vol 3 lab 1 and task 2.5 shows them enter the command
>
> mpls ldp password option 1 for 6 cisco
>
> on my router I can't seem to enter that command
>
>
> Version 12.4(15)T14
>
> R6(config)#mpls ldp ?
> ? advertise-labels? Label advertisements
> ? atm? ? ? ? ? ? ? Configure ATM MPLS options
> ? backoff? ? ? ? ? Set LDP session backoff parameters
> ? discovery? ? ? ? LDP discovery
> ? explicit-null? ? Advertise Explicit Null label in place of Implicit Null
> ? graceful-restart? Configure LDP Graceful Restart
> ? holdtime? ? ? ? ? LDP session holdtime
> ? igp? ? ? ? ? ? ? Configure IGP-related LDP parameters
> ? logging? ? ? ? ? Enable LDP logging
> ? loop-detection? ? Enable LDP Loop Detection
> ? maxhops? ? ? ? ? Limit hop count for LDP LSP setup
> ? neighbor? ? ? ? ? Configure neighbor parameters
> ? path-vector? ? ? Path Vector for LDP LSP setup
> ? request-labels? ? Access list to specify valid downstream on demand
> ? ? ? ? ? ? ? ? ? ? destinations.
> ? router-id? ? ? ? Select interface to prefer for LDP identifier address
> ? session? ? ? ? ? Configure session parameters
> ? tcp? ? ? ? ? ? ? Set TCP parameters for LDP
>
>
> The doc cd shows it as a valid command. Any ideas?
>
> Thanks,
>
> Marc
> _______________________________________________
> For more information regarding industry leading CCIE Lab training, please
> visit
> www.ipexpert.com
>
>
>
>
> _______________________________________________
> For more information regarding industry leading CCIE Lab training, please
> visit www.ipexpert.com
>
------------------------------
Message: 6
Date: Mon, 28 Mar 2011 14:27:22 +0100 (BST)
From: Ahmed Haji Munye <[email protected]>
To: CC IE <[email protected]>
Subject: [OSL | CCIE_RS] A Router as a DHCP server
Message-ID: <[email protected]>
Content-Type: text/plain; charset=iso-8859-1
Hi
I have got 28xx router with 2 FastEthernet interfaces. Fastethernet0/0 is
connected to 3560 switchs fastethernet0/10 which has 10 pcs with VLAN 10 and IP
address of 10.10.10.0/24. Then the routers FastEthernet 0/1 is connected to a
3550 switch?s fastethernet 0/11 wich has 5 hosts connected to it with VLAN 11
and subnet of 11.11.11.0 /24. Now, this is my home lab. But my question is how
do I configure the router as a DHCP server in order to offer the 10.10.10.0/24
in VLAN 10 and at the same time offer the subnet 11.11.11.0/24 in VLAN 11?
Please help me out?
Thanx
Ahmed
------------------------------
Message: 7
Date: Mon, 28 Mar 2011 08:29:17 -0500
From: marc abel <[email protected]>
To: Matt Hill <[email protected]>
Cc: [email protected]
Subject: Re: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
Message-ID:
<[email protected]>
Content-Type: text/plain; charset=ISO-8859-1
I have a pretty limited set of commands under tag switching:
R6(config-if)#tag-switching ?
ip Configure IP dynamic Tag Switching
mtu Set tag switching Maximum Transmission Unit
R6(config)#tag-switching ?
advertise-tags Tag advertisements
atm Configure ATM tagging options
ip Dynamic tag switching for IP
request-tags Specify valid downstream on demand destinations.
tag-range Tag range
tdp Tag Distribution Protocol
R6(config)#tag-switching ip ?
default-route Allow Tag Switching for ip default route
propagate-ttl Propagate IP TTL into the tag stack
<cr>
On Sun, Mar 27, 2011 at 10:36 PM, Matt Hill <[email protected]> wrote:
> I cant test this as I havent got a box in front of me to try..
>
> However can you find anything under tag-switching as opposed to mpls?
> That's the first place to look if something isnt there.
>
> Cheers,
> Matt
>
> CCIE #22386
> CCSI #31207
>
> On 28 March 2011 14:01, Rob Pool <[email protected]> wrote:
>> I ran into the same exact task today and if I"m understanding correctly, our
>> routers aren't at a new enough code release. I"m running Version 12.4(11)T. I
>> copied the info below from the command reference. If I"m incorrect please
>> let me
>> know. Thanks.
>>
>> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>>
>> 12.4(20)T? This command was integrated into Cisco IOS Release 12.4(20)T.
>> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>>
>> 12.4(20)T ?This command was integrated into Cisco?IOS Release 12.4(20)T.
>>
>>
>>
>>
>>
>>
>> ________________________________
>> From: marc abel <[email protected]>
>> To: [email protected]
>> Sent: Sun, March 27, 2011 10:31:35 PM
>> Subject: [OSL | CCIE_RS] MPLS LDP PASSWORD OPTION
>>
>> Working through Vol 3 lab 1 and task 2.5 shows them enter the command
>>
>> mpls ldp password option 1 for 6 cisco
>>
>> on my router I can't seem to enter that command
>>
>>
>> Version 12.4(15)T14
>>
>> R6(config)#mpls ldp ?
>> ? advertise-labels? Label advertisements
>> ? atm? ? ? ? ? ? ? Configure ATM MPLS options
>> ? backoff? ? ? ? ? Set LDP session backoff parameters
>> ? discovery? ? ? ? LDP discovery
>> ? explicit-null? ? Advertise Explicit Null label in place of Implicit Null
>> ? graceful-restart? Configure LDP Graceful Restart
>> ? holdtime? ? ? ? ? LDP session holdtime
>> ? igp? ? ? ? ? ? ? Configure IGP-related LDP parameters
>> ? logging? ? ? ? ? Enable LDP logging
>> ? loop-detection? ? Enable LDP Loop Detection
>> ? maxhops? ? ? ? ? Limit hop count for LDP LSP setup
>> ? neighbor? ? ? ? ? Configure neighbor parameters
>> ? path-vector? ? ? Path Vector for LDP LSP setup
>> ? request-labels? ? Access list to specify valid downstream on demand
>> ? ? ? ? ? ? ? ? ? ? destinations.
>> ? router-id? ? ? ? Select interface to prefer for LDP identifier address
>> ? session? ? ? ? ? Configure session parameters
>> ? tcp? ? ? ? ? ? ? Set TCP parameters for LDP
>>
>>
>> The doc cd shows it as a valid command. Any ideas?
>>
>> Thanks,
>>
>> Marc
>> _______________________________________________
>> For more information regarding industry leading CCIE Lab training, please
>> visit
>> www.ipexpert.com
>>
>>
>>
>>
>> _______________________________________________
>> For more information regarding industry leading CCIE Lab training, please
>> visit www.ipexpert.com
>>
>
End of CCIE_RS Digest, Vol 62, Issue 72
***************************************
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
