3Com 4210 PWR, Configuration Manual

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206 C
HAPTER
16: IGMP S
NOOPING
C
ONFIGURATION
In Ethernet port view
In VLAN view
Configuring a Port as a
Simulated Group
Member
Generally, hosts running IGMP respond to the IGMP query messages of the
multicast switch. If hosts fail to respond for some reason, the multicast switch may
consider that 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:
■
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.
■
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.
■
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 156 Configure a static router port in Ethernet port view
Operation Command Remarks
Enter system view system-view -
Enter Ethernet port view interface interface -type
interface-number
-
Configure the current port
as a static router port multicast
static-router-port vlan
vlan-id
Required
By default, no static router port is
configured.
Table 157 Configure a static router port in VLAN view
Operation Command Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Configure a specified port as a
static router port multicast
static-router-port
interface-type
interface-number
Required
By default, no static router
port is configured.
Table 158 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
-