Justin, Have you tried "clns mtu" under interface? Rgds Alex ----- Original Message ----- From: "Justin Shore" <[EMAIL PROTECTED]> To: "'Cisco-nsp'" <[email protected]> Sent: Tuesday, May 08, 2007 3:10 PM Subject: [c-nsp] IS-IS hello packet size issues
>I ran into another IS-IS problem this morning that stumped me. I > migrated an ATM router to our new core. In the process I took the > opportunity to try and get multi-area integrated IS-IS to work. This > basically consisted of removing the related net from the main IS-IS > process (the current config is merging areas) and move that net to a new > IS-IS process. Then I tried to enable IS-IS with the named tag on that > appropriate interface. This prompted the following error: > > %CLNS: Duplicate system ID configured in ip vrf <default> with router > isis null > > I haven't been able to work around that issue. > > I removed the new IS-IS process and added the net back to the original > process. A few minutes later I received a page stating that a > completely unrelated edge router just went down. The router turned out > to be up. What happens was the IS-IS broke. Through some debugging on > the edge router I determined that it was sending massive IS-IS IIHs > (9213 bytes). The MTU on the physicals interfaces on both sides has > been set 9216. The MPLS MTU has also been set to 9216. MPLS and LDP > have both been enabled on the interfaces. "No hello padding" was > configured on both sides. That didn't help. I enabled and disabled > hello padding on the edge router and they were all under 100 bytes. I > check the packet size on the 7600s in the core. I shutdown the > interfaces between the routers to kill IS-IS and then brought them back > online. No luck. Finally I rebooted the edge router. IS-IS still > wasn't working the router came up. This time however the IIHs were all > under 100bytes. Then I checked the 7600 again. At that point the 7600s > were sending 9213 bytes IIHs. Rebooting them wasn't an option. > > Has anyone seen this behavior before? > > Thanks > Justin > > > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
