Operation Manual – Multicast
H3C S3100 Series Ethernet Switches Chapter 2 IGMP Snooping Configuration
2-14
there is no member of the multicast group on the local subnet and remove the
corresponding path.
To avoid this from happening, you can configure a port of the VLAN of the switch as a
multicast group member. When the port receives IGMP query messages, the multicast
switch will respond. As a result, the port of the VLAN can continue to receive multicast
traffic.
Through this configuration, the following functions can be implemented:
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 2-16 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.
Caution:
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.
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