Multicast-Router Interfaces And Igmp Snooping Proxy Mode - Juniper ACX1000 Configuration Manual

ACX Series Universal Access Router Configuration Guide
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Multicast-Router Interfaces and IGMP Snooping Proxy Mode

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Proxy snooping reduces the number of IGMP reports sent toward an IGMP router.
NOTE: With proxy snooping configured, an IGMP router is not able to perform
host tracking.
As proxy for its host-side interfaces, IGMP snooping in proxy mode replies to the queries
it receives from an IGMP router on a multicast-router interface. On the host-side interfaces,
IGMP snooping in proxy mode behaves as an IGMP router and sends general and
group-specific queries on those interfaces.
NOTE: Only group-specific queries are generated by IGMP snooping directly.
General queries received from the multicast-router interfaces are flooded to
host-side interfaces.
All the queries generated by IGMP snooping are sent using 0.0.0.0 as the source address.
Also, all reports generated by IGMP snooping are sent with 0.0.0.0 as the source address
unless there is a configured source address to use.
Proxy mode functions differently on multicast-router interfaces than it does on host-side
interfaces.
Multicast Overview
Understanding Multicast Snooping
On multicast-router interfaces, in response to IGMP queries, IGMP snooping in proxy
mode sends reports containing aggregate information on groups learned on all host-side
interfaces of the bridge.
Besides replying to queries, IGMP snooping in proxy mode forwards all queries, reports,
and leaves received on a multicast-router interface to other multicast-router interfaces.
IGMP snooping keeps the membership information learned on this interface but does
not send a group-specific query for leave messages received on this interface. It simply
times out the groups learned on this interface if there are no reports for the same group
within the timer duration.
NOTE: For the hosts on all the multicast-router interfaces, it is the IGMP
router, not the IGMP snooping proxy, that generates general and
group-specific queries.
Multicast Overview
Understanding Multicast Snooping
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