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[Note]
The link-local multicast address in this command is within the following range.
IPv4: 224.0.0.0/24
IPv6: ff02::/112
[Example]
Frames received on VLAN #1 with the destination IPv4 address 224.0.0.251 are forwarded without discarding them as an
unknown multicast.
SWX3220(config)#l2-unknown-mcast discard
SWX3220(config)#l2-unknown-mcast forward 224.0.0.251 vlan1
8.1.11 Enable/disable function to transmit IGMP/MLD query when topology changes
[Syntax]
l2-mcast snooping tcn-query enable time
l2-mcast snooping tcn-query disable
no l2-mcast snooping tcn-query
[Parameter]
time : <1-30>
Wait time for transmitting IGMP/MLD query (seconds)
[Initial value]
l2-mcast snooping tcn-query disable
[Input mode]
global configuration mode
[Description]
Specifies operation of the function that transmits an IGMP/MLD query when the topology changes due to spanning tree.
If this command is executed with the "no" syntax, the setting returns to the default.
When both IGMP/MLD snooping and spanning tree are used together, multicast communication might stop temporarily due to
a change in topology, but that interval can be shortened by using this function.
If this is enabled, when a change in topology is detected, an IGMP/MLD query is transmitted after waiting the specified time.
If this is disabled, an IGMP/MLD query is not transmitted even if the topology changes.
[Example]
Enable transmission of an IGMP/MLD query when topology changes, and set the wait time to 5 seconds.
SWX3220(config)#l2-mcast snooping tcn-query enable 5
Disable transmission of an IGMP/MLD query when topology changes.
SWX3220(config)#l2-mcast snooping tcn-query disable
8.2 IGMP snooping
8.2.1 Set enable/disable IGMP snooping
[Syntax]
ip igmp snooping switch
no ip igmp snooping
[Parameter]
switch : IGMP snooping operations
Setting value Description
enable Enable IGMP snooping
disable Disable IGMP snooping
Command Reference | IP multicast control | 351