All things related to multicast

[Caren Litvanyi <>]

I have not seen this issue before, and I agree with opening
A TAC case with Cisco.
I was wondering, does this mean you have "ip sap listen"
turned on?  I tend not to unless really necessary.
Thanks,
Caren


On Thu, 23 Mar 2006, Michael Forrest wrote:

> 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


------------
Caren Litvanyi, network engineer
Global Research NOC at Indiana University

o:812-856-4576  c:720-839-7739