3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring IGMP Snooping Port Functions 547
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■ The static (S, G) joining function is available only if a valid multicast source
address is specified and IGMP Snooping version 3 is currently running on the
switch.
■ When you configure or remove a port as a static (*, G) or (S, G) member, the
port will not send an IGMP report or an IGMP leave message.
■ Static member ports and static router ports never age out. To delete such a
port, you need to use the corresponding command.
Configuring Simulated
Joining
Generally, a host running IGMP responds to IGMP queries from a multicast router.
If a host fails to respond due to some reasons, the multicast router will deem that
no member of this multicast group exists on the network segment, and therefore
will remove the corresponding forwarding path.
To avoid this situation from happening, you can enable simulated joining on a port
of the switch, namely configure the port as a simulated member of the multicast
group. When an IGMP query arrives, that member port will give a response. As a
result, the switch can continue receiving multicast data.
Through this configuration, the following functions can be implemented:
■ When an Ethernet port is configured as a simulated member host, it sends an
IGMP report.
■ When receiving an IGMP general query, the simulated host responds with an
IGMP report just like a real host.
■ When the simulated joining function is disabled on an Ethernet port, the
simulated host sends an IGMP leave message.
Follow these steps to configure simulated joining:
Configure a static member port igmp-snooping
static-group
group-address [
source-ip
source_address ] vlan
vlan-id
Required
Disabled by default
Configure a static router port igmp-snooping
static-router-port
vlan vlan-id
Required
Disabled by default
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Enter the
corresponding
view
Enter Ethernet interface
view
interface
interface-type
interface-number
Use either command
Enter interface group
view
port-group { manual
port-group-name |
aggregation agg-id }