Igmp Proxy; Igmp Querier; Query Interval - Avaya 2330 Manual

Layer 2 fundamentals
If IGMP Snooping is disabled, the Secure Router 2330/4134 handles IP multicast traffic in the
same manner as broadcast traffic (forwards frames received on one interface to all other
interfaces). Without IGMP Snooping, there is excessive traffic on the network, which negatively
impacts network performance. IGMP Snooping allows the Secure Router 2330/4134 to monitor
network traffic and to determine which hosts will receive multicast traffic.
For information on how to configure IGMP snooping, see Avaya Secure Router 2330/4134
Configuration — IPv4 Multicast Routing, (NN47263-504).

IGMP proxy

IGMP proxy allows the router to function as proxy for the hosts that are attached downstream
of the router. Upon receiving a query from a multicast router, a proxy-enabled router sends the
reports for all the group MAC addresses it has learned, instead of forwarding the reports to its
ports. When the router learns a new group MAC address, the report is forwarded to all multicast
router interfaces.
When the router receives a leave message from downstream hosts, the protocol data unit
(PDU) is forwarded to all multicast routes.

IGMP querier

You can configure the Secure Router 2330/4134 as a querier or non-querier. The querier
feature allows the Secure Router 2330/4134 to solicit membership information faster.
When you enable the querier feature on a VLAN, the Secure Router initiates IGMP general
queries to all the ports in that VLAN. However, when the Secure Router receives any IGMP
general query from other routers or switches on a VLAN, the querier functionality is
automatically disabled. The Secure Router 2330/4134 remains in the non-querier state as long
as it keeps receiving queries from outside. If no query is received for a period of time that
equals the query interval (the default value is 125 seconds), then the querier functionality is
enabled automatically.

Query interval

The query interval is the time interval between two queries sent by the Secure Router
2330/4134 when the IGMP Snooping querier feature is enabled. The range of query interval
is between 125000 milliseconds and 300000 milliseconds. The default value is 125000
milliseconds. The query interval is also used to calculate the group membership timer interval
and other querier timer interval as follows (IGMPv2 standard):
• Group membership timer interval—The "group membership interval" is the amount of time
that must pass before which an IGMP Snooping module decides there are no more
40 Configuration — Layer 2 Ethernet
Comments? infodev@avaya.com
July 2013