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IGMP messa
e Actions
Report
When receiving a report for a multicast group, the proxy looks up the
multicast forwarding table for the entry for the multicast group. If the
forwarding entry is found with the receiving port contained as a
dynamic member port in the outgoing port list, the proxy resets the
aging timer for the entry. If the forwarding entry is found but the
outgoing port list does not include the receiving port, the proxy adds
the port to the outgoing port list as a dynamic member port and starts
an aging timer for it. If no forwarding entry is found, the proxy
creates the entry, adds the receiving port to the outgoing port list as a
dynamic member port and starts an aging timer for the port. Then, it
sends a report to the group out all router ports.
Leave
In response to an IGMP leave message for a multicast group, the
proxy sends a group-specific query out the receiving port. After
making sure that no member port is contained in the forwarding entry
for the multicast group, the proxy sends a leave message to the group
out all router ports.
Protocols and standards
RFC 4541, Considerations for Internet Group Management Protocol (IGMP) and Multicast Listener
Discovery (MLD) Snooping Switches
IGMP snooping configuration task list
Complete these tasks to configure IGMP snooping:
Task Remarks
Configuring basic functions of
IGMP snooping
Enabling IGMP snooping Required
Configuring the version of IGMP snooping Optional
Configuring static multicast MAC address entries Optional
Configuring IGMP snooping
port functions
Configuring aging timers for dynamic ports Optional
Configuring static ports Optional
Configuring simulated joining Optional
Configuring fast-leave processing Optional
Disabling a port from becoming a dynamic router port Optional
Configuring IGMP snooping
querier
Enabling IGMP snooping querier Optional
Configuring IGMP queries and responses Optional
Configuring source IP address of IGMP queries Optional
Configuring IGMP snooping
proxying
Enabling IGMP snooping proxying Optional
Configuring a source IP address for the IGMP
messages sent by the proxy
Optional
Configuring an IGMP snooping
policy
Configuring a multicast group filter Optional
Configuring multicast source port filtering Optional
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