All things related to multicast

[Marshall Eubanks <>]

Dear John;

Are the flaps caused by routers outside your network ? Do you MSDP peer
with routers outside ?

I seem to remember problems in the 2000 time frame with inconsistent 
MSDP
implementations, but my memory is fuzzy here.

In any case, if you do MSDP peer with the outside, you might try taking 
down the
external peerings one by one and see if one of them is the culprit.

Regards
Marshall


On Wednesday, June 11, 2003, at 02:19 AM, John Barlow wrote:

> Peter John Hill writes:
> > Yep, we get that too. We run an msdp mesh with three cisco
> > routers. It happens, but multicast does not seem to be too
> > affected. Users can still see sdp's just fine. I have been
> > pretty much ignoring the message. Do you see any errors in
> > multicast itself?
>
> Most of the time it is fine, but occasionally the SA cache seems to
> suffer (perhaps from really fast MSDP flapping, entries time out before
> they can ne updated ??).  Examples of "dips" in our SA entires can be
> seen in the current SA graphs at:
>
>  http://noc.aarnet.edu.au/mrtg/router/multicast.html
>
> On the whole we live quite OK with these messages being a nuisance in
> our logs.
>
> If someone from Cisco is on the list, perhaps we could work together to
> pinpoint the cause of the flaps and request a code-fix ??  I am willing
> to suffer some pain to remove/reduce the error messages ...
>
>
> Thanks, John Barlow
T.M. Eubanks
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