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When specifying an IPv4 multicast address, frames received on the specified VLAN interface with the specified IPv4 multicast
address as the destination are forwarded.
If you specify IPv4 multicast addresses, you can set up to 100 addresses.
If this command is executed with the "no" syntax, the specified setting is cleared.
[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.
SWR2310(config)#l2-unknown-mcast discard
SWR2310(config)#l2-unknown-mcast forward 224.0.0.251 vlan1
8.1.3 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.
SWR2310(config)#l2-mcast snooping tcn-query enable 5
Disable transmission of an IGMP/MLD query when topology changes.
SWR2310(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
252 | Command Reference | IP multicast control