VPLS Features
Page 242 7210 SAS-X, R6 OS Services Guide
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.
Multicast VLAN Registration (MVR) support
Multicast VPLS Registration (MVR) is a bandwidth optimization method for multicast in a
broadband services network. MVR allows a subscriber on a port to subscribe and unsubscribe to a
multicast stream on one or more network-wide multicast VPLS instances.
MVR assumes that subscribers join and leave multicast streams by sending IGMP join and leave
messages. The IGMP leave and join message are sent inside the VPLS to which the subscriber port
is assigned. The multicast VPLS is shared in the network while the subscribers remain in separate
VPLS services. Using MVR, users on different VPLS cannot exchange any information between
them, but still multicast services are provided.
On the MVR VPLS, IGMP snooping must be enabled. On the user VPLS, IGMP snooping and
MVR work independently. If IGMP snooping and MVR are both enabled, MVR reacts only to join
and leave messages from multicast groups configured under MVR. Join and leave messages from
all other multicast groups are managed by IGMP snooping in the local VPLS. This way,
potentially several MVR VPLS instances could be configured, each with its own set of multicast
channels.
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