H3C S5100-SI

2-12
z When an Ethernet port is configured as a simulated member host, the switch sends an IGMP report
through this port. Meanwhile, the switch sends the same IGMP report to itself and establishes a
corresponding IGMP entry based on this report.
z When receiving an IGMP general query, the simulated host responds with an IGMP report.
Meanwhile, the switch sends the same IGMP report to itself to ensure that the IGMP entry does not
age out.
z When the simulated joining function is disabled on an Ethernet port, the simulated host sends an
IGMP leave message.
Therefore, to ensure that IGMP entries will not age out, the port must receive IGMP general queries
periodically.
Table 2-17 Configure a port as a simulated group member
Operation Command Remarks
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the current port as a
simulated multicast group
member
igmp host-join group-address
[source-ip source-address ]
vlan vlan-id
Optional
Simulated joining is disabled by
default.
z Before configuring a simulated host, enable IGMP Snooping in VLAN view first.
z The port to be configured must belong to the specified VLAN; otherwise the configuration does not
take effect.
z You can use the source-ip source-address command to specify a multicast source address that
the port will join as a simulated host. This configuration takes effect when IMGPv3 Snooping is
enabled in the VLAN.
Configuring a VLAN Tag for Query Messages
By configuring the VLAN tag carried in IGMP general and group-specific queries forwarded and sent by
IGMP Snooping switches, you can enable multicast packet forwarding between different VLANs In a
Layer-2 multicast network environment.
Follow these steps to configure VLAN tag for query message:
Table 2-18 Configure VLAN Tag for query message
Operation Command Remarks
Enter system view
system-view
—
Enable IGMP Snooping
igmp-snooping enable
Required
By default, IGMP Snooping is
disabled.