Configuration Guide

Table Of Contents
©2021 Extreme Networks, Inc. All rights reserved
October 2021
21
Multicast
Multicast over SPB L2 VSNs, L3 VSNs, or IP Shortcuts is supported on the ERS 8800 beginning in the
7.2 release, on the VSP 4000 in the 3.1 release, the VSP 7200 in the 4.2.1 release, the VSP 9000 in the
3.4 release and the VSP 8000 in the 4.1 release. The ERS 4800 in release 5.9 and the ERS 5900 in release
7.0 support multicast over L2 VSNs only; please note multicast is constrained to within the VSN only.
Multicast is supported over SPB by globally enabling the feature and just enabling IGMP at the SPB edge.
There is no need for any multicast routing protocols such as PIM, hence, multicast over SPB greatly
simplifies multicast deployment. A multicast stream can be forwarded anywhere in a SPB network where
IS-IS is used to advertise the stream to the rest of the fabric. Note that the stream is not forwarded until a
receiver requests to join a specific multicast group and it is only forwarded to those receivers who requested
it.