From: Richard Letts <R.J.Letts@salford.ac.uk>
Subject: Routing Bug - cisco or Novell or 3com ?
Date: 6 Jan 93 14:32:15 GMT
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This is a real nitty-gritty problem involving cisco routers, and 3.11 servers.


We have the following setup on part of our network :

		    		       CWB-A	CWB-B	WHITWORTH-1
		LANA		       | | |       |       |
    |----------------------------------(-(-+-------+-------+--- 
    |  Arpa:100000	               | |	
    |                                  | |     Faith
    |		LANB	               | |       |[Arpa Framing]
   cisco ------------------------------(-+-------+------------ 
    | Arpa:  100FF8   novell:100008    |
    |                                  |      NEWTON-1
    |		LANC                   |         |[novell framing]
    |----------------------------------+---------+-------- 
   Arpa:100FF7			novell:100007

ie:
LANA is the main fileserver backbone in out machine room - 6 servers attached
to it, no workstations.
	server CWB-A : Three 3c527 cards
	server CWB-B : one   3c527 card
	servers Whitworth-[1234] : Three LNE391 cards

LANB : Staff offices - workstations use Novell frame types
       server NEWTON-1  : LNE391 card - Novell frames
			[reply to get nearest server=OFF]

TWO separate logical novell networks exist on LANC
LANC : Staff offices - workstations use Novell frame types
LANCE		server FAITH  : NE2000 card - Arpa encapsulation
			[reply to get nearest server=ON]

basically: Servers talk to servers and Routers using ARPA encapsulation
	   workstations talk to servers using 802.3 / Novell encapsulation

The problem :
============
This worked fine until this morning when I upgraded the cisco router
from 8.2(5) to 9.0(2) of the software. NOW I get lots of messages on
the CWB-A router saying :

'router at node 0260802cf912 claims 100000 should be 100008'
[This particular address is that of the LANB network card in the CWB-A server]
'router at node 0260802cf9e4 claims 100000 should be 100007'
[This particular address is that of the LANA network card in the CWB-A server]
'router at node 0800E5794238 claims 100000 should be 100008'
[this is NEWTON-1's network card]

and similar messages for other devices on the network.

below is a copy of the configuration for the cisco router:

!
novell routing 0000.0c01.282a
!
! LANA
interface Ethernet 0
ip address 146.87.0.129 255.255.255.128
novell network 100000
novell encapsulation ARPA
novell helper-address -1.ffff.ffff.ffff
bridge-group 1
!
! LANB
interface Ethernet 2
ip address 146.87.1.1 255.255.255.128
novell network 100FF8
novell encapsulation ARPA
novell helper-address -1.ffff.ffff.ffff
bridge-group 1
!
! LANC
interface Ethernet 3
ip address 146.87.1.129 255.255.255.128
novell network 100FF7
novell encapsulation ARPA
novell helper-address -1.ffff.ffff.ffff
bridge-group 1
!

What I've found so far:

Turning off bridging on ethernet0 [LANA] of the cisco does not stop the problem.
I cannot turn bridging off on the other interfaces because this prevents the
ISO CONS from staff offices being bridged.

If it is a problem in the 3c527 driver - Why doesn't it affect the CWB-B
server. Upgrading from v3.11 to v3.12 of the driver hasn't changed the
problem.

If it is a problem in the cisco software - Why doesn't it affect any of the
other servers ?

Any Ideas on what I should try now ?

Richard
-- 
Richard Letts
Network Manager
University of Salford               Email: R.J.Letts@salford.ac.uk
United Kingdom			    Phone : +44 61 745 5252
United States of Europe	
Newsgroups: comp.dcom.sys.cisco