[c-nsp] Layer 2 multicast issues

[vince anton]

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

ascii diagram of setup:

IPMC SOURCE<>SVI--C3560--SVI<>L2-SWITCHES/RECEIVERS


Thanks for any insight

anton