[c-nsp] Layer 2 multicast issues

[Phil Mayers]

vince anton wrote:
> Hi list
> 
> Im looking for some advice in troubleshooting a flat layer 2 network, made
> up of a number of L2 interconnected/cascaded switches running ip multicast.
> 
> currently, such network has about 50 video streams (or multicast groups)
> from a single source at around 3-4Mbps each, and there are some issues with
> video quality on some receivers, although this is random and i cant seem to
> find a pattern yet.
> 
> im trying to understand what issues with IP multicast traffic may be, and
> what the root cause is, given that all of the swithces support IGMP snooping
> in hardware, and dont have a maxed-out CPU

Do you have an IGMP querier on the network? IGMP snooping works a lot 
better if you do.