EX2500 Ethernet Switch Configuration Guide
The
1.An IP Multicast router (Mrouter) sends Membership Queries to the switch, which forwards them to all ports in a given VLAN.
2.Hosts that want to receive the multicast data stream send Membership Reports to the switch, which sends a proxy Membership Report to the Mrouter.
3.The switch sets up a path between the Mrouter and the host, and blocks all other ports from receiving the multicast.
4.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.
5.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 EX2500 switch supports the following IGMP capacities:
IGMP versions 1, 2, and 3
1024 VLANs
128 Mrouters
1024 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:
ex2500(config)# [no] ip igmp flood
FastLeave
In normal IGMP operation, when the switch receives an IGMPv2 leave message, it sends a
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
If no multicast routers have been learned on that port.
With FastLeave enabled on the VLAN, a port can be removed immediately from the port list of the group entry when the IGMP Leave message is received, unless a multicast router was learned on the port.
Enable FastLeave only on VLANs that have only one host connected to each physical port. To enable FastLeave, use the following command:
ex2500(config)# ip igmp fastleave <VLAN number
72 FastLeave
