H3C Technologies H3C S3100 Series Switches - Manual (Page 300)

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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 2-16 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
Required
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 IGMPv3 Snooping is
enabled in the VLAN.
Configuring a VLAN Tag for Query Messages
By configuring the VLAN in which IGMP general and group-specific queries forwarded and sent by
IGMP Snooping switches are transmitted, you can enable multicast packet forwarding between different
VLANs In a Layer-2 multicast network environment.
Table 2-17 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.
Configure a VLAN tag for query
messages igmp-snooping vlan-mapping
vlan vlan-id
Required