From: John Wong (johnwk@unimelb.edu.au)
Date: Sun Oct 24 2004 - 18:29:47 GMT-3
A very big thank you to all who've replied.
I found out that the problem may not lie with the IS-IS configuration.
It may be something to do with the hardware or cable. I couldn't do a ping
with anything above 508 bytes from R3 to R7 over the serial/FR interface
but could ping all the way up to 1500 bytes from R1. So I suspect it could
be the serial card or the cable used from R3 to the FR switch/router.
Cheers.
Wam wrote:
> John,
> i would check as follows..
>
> 1. Assuming FR switch is fully meshed, i would check "show fram-relay map" to make sure static mapping is as required (between R3 and R7), even though "no frame inv-arp and frame map" statements are there.
>
> 2. From your debug output, i would be concerned if my peer interface parameters like MTU are in sync.
>
> -Wam
>
> John Wong <johnwk@unimelb.edu.au> wrote:
> Hi all,
>
> Need help from you Gurus on a strange IS-IS problem I am encountering
> at the moment. Any help is much appreciated.
>
> I am getting the below message on a hub router in a FR network
> configured to run IS-IS :-
>
> Oct 24 21:19:13 SGT: %CLNS-3-BADPACKET: ISIS: LAN L2 hello, packet (1500) or wire (988) length invalid from DLCI 703 (Serial0/2.1)
>
> The adjacency is stuck at the Init stage in R3 (spoke) and not appearing
> at all in R7 (hub).
>
> Strange thing is that I have 2 identically configured routers (R1 & R3)
> as the spokes and the hub router (R7) can establish adjacency with one of
> them (R1) but not the other (R3). Both R1 & R3 are of the same hardware
> platform and runs the same version of IOS image.
>
> Relevant configuration as below :-
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !
> hostname R1
> !
> interface Serial0
> no ip address
> encapsulation frame-relay
> no frame-relay inverse-arp
> !
> interface Serial0.1 multipoint
> ip address 192.168.1.1 255.255.255.0
> ip router isis
> frame-relay map clns 107 broadcast
> frame-relay map ip 192.168.1.3 107 broadcast
> frame-relay map ip 192.168.1.7 107 broadcast
> !
> router isis
> net 47.0200.0102.5500.0001.00
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !
> hostname R3
> !
> interface Serial0
> no ip address
> encapsulation frame-relay
> no frame-relay inverse-arp
> !
> interface Serial0.1 multipoint
> ip address 192.168.1.3 255.255.255.0
> ip router isis
> frame-relay map clns 307 broadcast
> frame-relay map ip 192.168.1.1 307 broadcast
> frame-relay map ip 192.168.1.7 307 broadcast
> !
> router isis
> net 47.0000.0102.5500.0003.00
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
> !
> hostname R7
> !
> interface Serial0/2
> no ip address
> encapsulation frame-relay
> no frame-relay inverse-arp
> !
> interface Serial0/2.1 multipoint
> ip address 192.168.1.7 255.255.255.0
> ip router isis
> isis priority 120
> frame-relay map clns 703 broadcast
> frame-relay map clns 701 broadcast
> frame-relay map ip 192.168.1.1 701 broadcast
> frame-relay map ip 192.168.1.3 703 broadcast
> !
> router isis
> net 47.0100.0102.5500.0007.00
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
> R1#sh clns neigh
> System Id Interface SNPA State Holdtime Type Protocol
> R7 Se0.1 DLCI 107 Up 7 L2 IS-IS
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
> R3# sh clns neigh
> System Id Interface SNPA State Holdtime Type Protocol
> 0102.5500.0007 Se0 DLCI 307 Init 9 L2 IS-IS
>
> !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
>
> R7#sh clns neighbors
> System Id Interface SNPA State Holdtime Type Protocol
> R1 Se0/2.1 DLCI 701 Up 24 L2 IS-IS
>
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