All things related to multicast

["Michael Forrest" <>]

Thanks for the reply :-)

I'm in the process of opening a ticket with our support company, who in turn
will raise a ticket with Cisco TAC. But figured I would do a quick check to
see if anyone had seen similar problems.

It's running the latest of version since its also running ipv6
unicast/multicast routing within the same platform and 12.4 was the
recommended version. 

Looks like 12.3(18) is the latest 12.3 release, so may give that a try
tomorrow and see if the problem is still the same.


> -----Original Message-----
> From: Peter John Hill 
> [mailto:]
> Sent: 23 March 2006 17:54
> To: Michael Forrest
> Cc: 
> 
> Subject: Re: Cisco IPv4 Multicast Issue
> 
> We thank you for beta testing this software for us... If I picked the
> correct image.. this image was released 01-MAR-2006.
> 
> Well, you should open a ticket up with Cisco so that they can file a
> bug. I did not find any obvious candidates, so it looks new.
> 
> In the mean time, what features do you need in 12.4(7)? Do you need
> 12.4 in general? In fact, do you need 12.3? Many more bugs have been
> fixed in 12.2 (and 12.3). They have been found by people who want to
> run the latest code. Just the fact that it is only a (7) release
> makes me scared.. That is 7 patches. Not too many.
> 
> Peter
> 
> 
> 
> On Mar 23, 2006, at 8:21 AM, 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
> >
> >
> >