From: McCallum, Robert (Robert.McCallum@xxxxxxxxxxxxxxxxxx)
Date: Thu Mar 01 2001 - 06:42:19 GMT-3
one strange problem that can arise through the Ethernet ports is when one
router is configured as a level 1-2 and the other just a level-2 only. You
should put on the Ethernet port isis circuit-type level-2. This will then
form the proper adjacency and low and behold your routes will filter on
through. I have encountered this a few times but to to be honest it wasn't
between 2 Cisco devices. Try it any way. But as Chuck has said in the
previous mail show us your debug outputs for isis adj and also show isis
route and show clns route, interface.
-----Original Message-----
From: Chuck Larrieu [mailto:chuck@cl.cncdsl.com]
Sent: 01 March 2001 06:52
To: bbolles@creekpath.com; ccielab@groupstudy.com
Subject: RE: ISIS - weird problem with ethernet switch.
What do your debug isis adj outputs show?
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
bbolles@creekpath.com
Sent: Wednesday, February 28, 2001 7:45 PM
To: ccielab@groupstudy.com
Subject: ISIS - weird problem with ethernet switch.
I am having an odd problem getting ISIS to run successfully between two 2501
(IOS 12.0(13)) routers connected via an Ethernet segment through a 2912xl
switch. The odd thing is that other traffic (ping, RIP, OSPF, BGP) has been
working fine between these two routers via the 2912, and on the same exact
VLAN. If I connect the two routers together via a X-over ethernet cable,
ISIS routing updates work and all is well.
As far as I can tell, my cabling is OK because other traffic works fine.
Just to be sure, I did try other known good cables with no success.
Likewise, I have forced the ports on the 2912 to 10M/half. I feel I am
running into some issue with broadcast or multicast packets not being
forwarded by the 2912xl switch.
Have any of you heard of an issue like this before? I searched the archives
and the closest thing I came across was an MTU setting issue when using ISIS
over Token Ring. I verified that my clns mtu setting is 1497 as dictated by
the physical interface.
Thanks for your help,
Ben Bolles
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