H3C Technologies H3C S5120 Series Switches - Manual (Page 315)

2-10
Configuring Static Ports
If all the hosts attached to a port are interested in the multicast data addressed to a particular multicast
group or the multicast data that a particular multicast source sends to a particular group, you can
configure static (*, G) or (S, G) joining on that port, namely configure the port as a group-specific or
source-and-group-specific static member port.
You can configure a port of a switch to be a static router port, through which the switch can forward all
the multicast traffic it received.
Follow these steps to configure static ports:
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 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 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.