3Com 7757 Configuration Manual page 456

456 C 46: IGMP C
HAPTER
c
Configuring IGMP
Multicast Groups on the
Interface
ONFIGURATION
Table 364 Configure IGMP query messages
Operation
Enable the multicast routing
protocol
Enter VLAN interface view
Enable IGMP on the current
interface
Configure the query interval
Configuring the interval of
sending IGMP group-specific
query messages
Configuring the times of
sending IGMP group-specific
query messages
Configure the maximum
lifetime of an IGMP querier
Configure the maximum
IGMP query response time
CAUTION: When there are multiple multicast routers in a network segment, the
querier is responsible for sending IGMP query messages to all the hosts in the
network segment.
You can perform the following configurations on the interface for the IGMP
multicast groups:
Limit the number of multicast groups
■
Limit the range of multicast groups that the interface serves
■
Limiting the number of joined multicast groups
If the number of joined IGMP groups on the multicast routing interface of the
switch is not limited, the memory of the switch may be used out and the routing
Command
multicast routing-enable
interface Vlan-interface
interface-number
igmp enable
igmp timer query seconds
igmp
lastmember-queryinterval
seconds
igmp robust-count
robust-value
igmp timer
other-querier-present
seconds
igmp max-response-time
seconds
Description
Required
-
Required
By default, if the IP multicast
routing protocol is enabled
globally, IGMP is enabled on
all the layer-3 interfaces
automatically.
Optional
The query interval is 60
seconds by default.
Optional
By default, the interval of
sending IGMP group-specific
query messages is 1 second.
Optional
By default, the times of
sending IGMP group-specific
query messages is 2.
Optional
The lifetime of an IGMP
■
querier is 120 seconds by
default.
If the Layer 3 switch does
■
not receive query
messages in two times of
the interval specified by
the igmp timer query
command, the former
querier is considered as
ineffective.
Optional
The maximum IGMP query
response time is 10 seconds.