Anyone have experience with multicast filtering features as
IP IGMP Filter or IP IGMP Max-groups features in a layer-2 switching environment or
in a layer-3 environment IP IGMP ACL or IP IGMP Limit features on a router?
Is it better to filter on ingress user ports on a layer-2 switch or utilize layer-3 filtering techniques on the router or BOTH?
Is some other method better?
Our switches are 2960, 3750 and 4500 series.
What we're doing - I'm starting to roll out multicast (PIM Sparse-mode only, for now) across the MPLS WAN (~300 sites) using redundant auto-RPs via Anycast and group dissemination between mapping agents via MSDP. Multicast groups will consist of a /28 group range (126.96.36.199/28) so our multicast setup will be considered small. Each LAN environment is configured to use IGMPv3 on VLC clients. Since this may well end up being a 1 man show, I would like to take as many up front precautions as I can - perhaps ease up on the restrictions later on.
So far I have noticed many local devices continue to solicit for their group addresses I.E. HP at 188.8.131.52, MS SSDP at 184.108.40.206, Novell SLP at 220.127.116.11 etc. etc. etc. I don't want surprises to complicate this implementation. I cannot force the support staff to correct these issues so I have to work around 'em - with filtering I guess!!!