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IGMP snooping fast leave in multiple host mode—CR00017482 93
Version 291-10
C613-10488-00 REV G
IGMP snooping fast leave in multiple host mode—CR00017482
The IGMP snooping fast leave option has been enhanced, to make it available when multiple clients are attached to a single port on the snooping switch. Fast
leave now has two modes available:
■ multiple host mode—the new feature. In multiple host mode, the snooper tracks which clients are joined to a given IP multicast group on a given port. As
soon as the last client leaves a group on a port, the snooper shuts off the multicast to that port.
■ single host mode—the existing functionality. In single host mode, as soon as the snooper receives a leave message for a group on a port, it shuts off the
multicast. This mode assumes that there are no other clients on the port that are still interested in receiving the multicast, so is suitable only when clients are
directly attached to the snooper.
To specify the new multiple mode, use the command:
set igmpsnooping vlan={vlan-name|1..4094|all} fastleave=multiple
To specify single mode, use either of the commands:
set igmpsnooping vlan={vlan-name|1..4094|all} fastleave=single
set igmpsnooping vlan={vlan-name|1..4094|all} fastleave=on
The command show igmpsnooping vlan has also been enhanced. The new command syntax is:
show igmpsnooping vlan={vlan-name|1..4094|all} [group={multicast-ip-address|allgroups}] [detail]
The group parameter lets you display information for only one group or for only the All Groups port (the allgroups option).