All things related to multicast

[Greg Shepherd <>]

On Fri, 5 Apr 2002, Jay Ford wrote:

> On Thu, 4 Apr 2002, Michael Hare wrote:
> > I work for WiscNet (statewide educational network) up in Wisconsin.  We're
> > starting to offer multicast services to any of our 500+ members who 
> > request
> > it.  We currently run a sparse-mode WAN network, use anycast RP, and have
> > two MSDP peering points with the outside world.  I'm struggling with how 
> > to
> > exchange multicast with those members.  How are other organizations
> > operating?
>
> I have a situation which is perhaps sufficiently similar that you might be
> able to shed some light related to the outside-world MSDP configuration.
>
> I have 2 border routers which do MBGP+MSDP with the outside world, one to
> MREN (primary Abilene...) & the other to Iowa State University (secondary
> Abilene).  It seems that I should take some care to avoid creating a MSDP
> loop (uiowa-MREN-Abilene-iastate-uiowa).  Is that a real concern?  If so, do
> you have some advice on how to do the SA filtering or whatever is required?

If the two routers each MBGP+MSDP with the upstream AND with eachother,
the MSDP peer-RPF rules will (should) prevent SA loops.

Greg

> Documentation references or config excerpts would be appreciated.
>
> ________________________________________________________________________
> Jay Ford, Network Engineering Group, Information Technology Services
> University of Iowa, Iowa City, IA 52242
> email: 
> ,
>  phone: 319-335-5555, fax: 319-335-5505
>
>