Virtual Private LAN Services
7210 SAS M Services Guide Page 257
Configuration Guidelines for IGMP Snooping
The following IGMP snooping considerations apply:
• Layer 2 multicast is supported in VPLS services.
• IGMP snooping is not supported for VCs (either vc-ether or vc-vlan) with control-word
enabled.
• IGMP snooping fast leave processing can be enabled only on SAPs and SDPs. IGMP
snooping proxy summarization is enabled by default on SAPS and SDPs and cannot be
disabled. Proxy summarization and fast leave processing are supported only on SDPs
whose VC are configured to use vc-type ether and do not have control-word enabled.
• IGMP filtering using policies is available on SAPs and SDPs. It is supported only on
SDPs whose VC are configured to use vc-type ether and do not have control-word
enabled.
• Dynamic learning is only supported on SDPs whose VC are configured to use vc-type
ether and do not have control-word enabled.
• SDPs that are configured to use VC of type 'vc-vlan' that need to be mrouter ports must be
configured statically. Multicast group memberships for such SDPs must be configued
statically. Dynamic learning is not available for these SDPs.
• IGMP snooping is not supported for control word enabled SDP.
• 7210 SAS-M in network mode does not support IGMPv3.
Multicast VLAN Registration (MVR) support
Multicast VLAN registration (MVR) allows operators to use a single network wide multicast
VLAN (or a VPLS service) to deliver multicast traffic in the aggregation and access network and
distribute the multicast traffic to subscribers using the VLANs specific to the subscribers. Use of
single multicast VLAN saves bandwidth and eases operations. MVR must be used in conjunction
with IGMP snooping. It uses the IGMP join and leave messages to determine the subscribers who
are interested to receive a particular multicast stream.
Note: This feature is supported in 7210 SAS-M network mode and access-uplink mode.
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