All things related to multicast

["Michael Forrest" <>]

Has anyone seen the following issue with Cisco router running ipv4
multicast?

The log messages just seem to be full of the following msg:-

Mar 20 16:05:38 door.erg.abdn.ac.uk 299: *Mar 16 06:39:31.369 UTC:
%MROUTE-6-UNSUPPORTED_SAP_FORMAT: Received unsupported format SAP message
from (129.116.74.139)

The MFIB (multicast forwarding information base) seems to have a memory leak
and eventually consumes all the memory available on the router. The router
becomes inaccessible on the console and over the network and requires a
power cycle to recover. Although strangely enough, still seems to be
functional (if just unaccessible).

A show ver from the router yields (it's a Cisco 2621XM):-

Cisco IOS Software, C2600 Software (C2600-ADVENTERPRISEK9-M), Version
12.4(7), RELEASE SOFTWARE (fc6)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2006 by Cisco Systems, Inc.
Compiled Tue 28-Feb-06 23:32 by alnguyen

Doing a show proc memory shows that it seems to consume about 1MB of memory
every 4-5hours until the router just falls over.

All the unsupported SAP messages come from a cluster of machines with
similar names to:-

vbrick-cma5136.communication.utexas.edu

Anyone had/solved this issue before?

-Michael

--
Michael Forrest,
Directorate of Information Systems and Services,
University of Aberdeen.

Tel: +44-1224-273392