H3C Technologies H3C S7500E Series Switches - Manual (Page 45)

2-13
To do... Use the command... Remarks
view or port group view
port-group manual
port-group-name
Use either approach
Configure the port(s) as static
member port(s)
igmp-snooping static-group
group-address [ source-ip
source-address ] vlan vlan-id
Required
No static member ports by
default
Configure the port(s) as static
router port(s)
igmp-snooping
static-router-port vlan vlan-id
Required
No static router ports by default
z 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.
z 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.
z If IGMP is enabled on the virtual interface of a VLAN on a switch and you want a port in that
VLAN to be a static multicast group or source-group member port, in addition to configuring
the port as a static member port, you need to use the igmp static-group command to
configure the VLAN interface to be a static member of the multicast group or source and
group. For details of the igmp static-group command, refer to IGMP Configuration
Commands in the IP Multicast Command Reference.
z 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:
z When a port is configured as a simulated member host, the switch sends an unsolicited
IGMP report through that port.
z After a port is configured as a simulated member host, the switch responds to IGMP
general queries by sending IGMP reports through that port.