Configuring Simulated Joining - 3Com 4510G Configuration Manual

Follow these steps to configure static ports:
To do...
Enter system view
Enter Ethernet port/Layer 2
aggregate port view or port
group view
Configure the port(s) as static
member port(s)
Configure the port(s) as static
router port(s)
A static (S, G) joining can take effect only if a valid multicast source address is specified and IGMP
Snooping version 3 is currently 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 may 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 host for a multicast group. When receiving an IGMP
query, the simulated host gives a response. Thus, the switch can continue receiving multicast data.
A simulated host acts like a real host, as follows:
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.
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
igmp-snooping static-group
group-address [ source-ip
source-address ] vlan vlan-id
igmp-snooping
static-router-port vlan vlan-id
2-9
Remarks
—
Required
Use either approach
Required
No static member ports by
default
Required
No static router ports by default