All things related to multicast

[Peter John Hill <>]

On Tuesday, November 12, 2002, at 10:27  AM, Alan Crosswell wrote:

> > There's no need to turn IGMP Snooping off. Theoretically, RGMP on the
> > switch side is independent of IGMP Snooping, practically speaking,
> > on the cat6k IGMP Snooping should always be enabled if you also have
> > L3 routing for IP Multicast.
>
>
> It's turned off on my dual-star L2 core 6509's that all the routers 
> plug
> in to.  When it was one, I was getting random disconnectivity caused I
> think by it snooping IGMP router advertisements.  There are no hosts on
> the L2 core 6509's.\

Thanks for starting this thread. I hadn't looked into RGMP prior to 
your post. I had the same thoughts about IGMP snooping, I had felt that 
it would be of little use in the core, since everything (I think) is 
done with PIM. We do have a couple of 100 mbits/sec links on our core, 
the rest is gigabit, so it would make sense to look into RGMP as we 
start increasing the utilization of multicast throughout campus.

On a separate note, (which you can respond off-list if you wish) are 
you considering going to a layer 3 core. I am pretty interested in 
moving some of our Tier-2 groups, as we call them, off of the l2 core, 
and routing them. Basically, any router that we do not control. Our CS 
department, for example, connects their router to our cores, and when 
we want to make changes to our ospf, for example, we need to coordinate 
with them, and a couple of other groups.

Does anyone know of any Network Engineering/Architecture mailing lists 
of a more general nature for I2 schools?

Thanks!

Peter Hill
Network Engineer
Carnegie Mellon University

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