H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 442)

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When an Ethernet port is configured as a simulated member host, the device sends an IGMP
report through this port. Meanwhile, the device sends the same IGMP report to itself and
establishes a corresponding IGMP entry based on this report.
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When receiving an IGMP general query, the simulated host responds with an IGMP report.
Meanwhile, the device sends the same IGMP report to itself to ensure that the IGMP entry does not
age out.
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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.
Follow these steps to configure a port as a simulated group member:
To do… Use the 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.
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Before configuring a simulated host, enable IGMP Snooping in VLAN view first.
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The port to be configured must belong to the specified VLAN; otherwise the configuration does not
take effect.
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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 devices and by configuring the VLAN mapping function, you can enable multicast
packet forwarding between different VLANs In a Layer-2 multicast network environment.
For description about VLAN mapping, see QoS-QoS Profile in H3C WX3000 Series Unified Switches
Switching Engine Configuration Guide .
Follow these steps to configure VLAN Tag for query message:
To do… Use the command… Remarks
Enter system view system-view —
Enable IGMP Snooping igmp-snooping enable
Required
By default, IGMP Snooping is disabled.