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BLADE OS 5.1 Application Guide
182
Chapter 13: IGMP BMD00136, November 2009
The switch can sense IGMP Membership Reports from attached clients and act as a proxy to set up
a dedicated path between the requesting host and a local IP Multicast router. After the pathway is
established, the switch blocks the IP Multicast stream from flowing through any port that does not
connect to a host member, thus conserving bandwidth.
The client-server path is set up as follows:
An IP Multicast Router (Mrouter) sends Membership Queries to the switch, which forwards
them to all ports in a given VLAN.
Hosts that want to receive the multicast data stream send Membership Reports to the switch,
which sends a proxy Membership Report to the Mrouter.
The switch sets up a path between the Mrouter and the host, and blocks all other ports from
receiving the multicast.
Periodically, the Mrouter sends Membership Queries to ensure that the host wants to continue
receiving the multicast. If a host fails to respond with a Membership Report, the Mrouter stops
sending the multicast to that path.
The host can send a Leave Report to the switch, which sends a proxy Leave Report to the
Mrouter. The multicast path is terminated immediately.
The G8000 supports the following IGMP capacities:
IGMP version 1, 2, and 3
8 VLANs
52 Mrouters
1000 multicast groups
Note – Unknown multicast traffic is sent to all ports if the flood option is disabled.
To enable or disable IGMP flood, use the following command:
RS G8000 (config)# [no] ip igmp snoop flood
FastLeave
In normal IGMP operation, when the switch receives an IGMPv2 Leave message, it sends a
Group-Specific Query to determine if any other devices in the same group (and on the same port)
are still interested in the specified multicast group traffic. The switch removes the affiliated port
from that particular group, if the following conditions apply:
If the switch does not receive an IGMP Membership Report within the query-response-interval.
If no multicast routers have been learned on that port.