H3C Technologies H3C S3100V2 Series Switches - Manual (Page 30)

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To do... Use the command... Remarks
Configure the port(s) as static
router port(s) igmp-snooping static-router-port
vlan vlan-id Required
No static router ports by default
NOTE:
•
A static (S, G) joining can take effect only if a valid multicast source address is specified and IGMP
snooping version 3 is running.
• A static member port does not respond to queries from the IGMP querier; when static (*, G) or (S, G)
joining is enabled or disabled on a port, the port does not send an unsolicited IGMP report or an IGMP
leave message.
• Static member ports and static router ports never age out. To remove such a port, you need to use the
corresponding undo command.
Configuring simulated joining
Generally, a host running IGMP responds to IGMP queries from the IGMP querier. If a host fails to
respond due to some reasons, the multicast router might deem that no member of this multicast group
exists on the network segment, and will remove the corresponding forwarding path.
To avoid this situation from happening, enable simulated joining on a port of the switch, namely
configure the port as a simulated member host for a multicast group. When receiving an IGMP query, the
simulated host gives a response. The switch can continue receiving multicast data.
A simulated host acts like a real host:
• When a port is configured as a simulated member host, the switch sends an unsolicited IGMP
report through that port.
• After a port is configured as a simulated member host, the switch responds to IGMP general queries
by sending IGMP reports through that port.
• When the simulated joining function is disabled on a port, the switch sends an IGMP leave
message through that port.
Follow these steps to configure simulated joining:
To do... Use the command... Remarks
Enter system view system-view —
interface interface-type interface-number Enter Ethernet interface/Layer 2
aggregate interface view or port
group view port-group manual port-group-name
Required
Use either approach
Configure simulated (*, G) or (S,
G) joining igmp-snooping host-join group-address
[ source-ip source-address ] vlan vlan-id Required
Disabled by default
NOTE:
•
Each simulated host is equivalent to an independent host. For example, when receiving an IGMP query,
the simulated host corresponding to each configuration responds respectively.
• Unlike a static member port, a port configured as a simulated member host will age out like a dynamic
member port.