3Com Switch 7700 Configuration Manual page 208

200 C 6: M
HAPTER ULTICAST
P
ROTOCOL
Configuring the IGMP Querier Present Timer
■
Configuring the Maximum Query Response Time
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Deleting IGMP Groups Joined on an Interface
■
Displaying and Debugging IGMP
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Enabling Multicast
After multicast is enabled, IGMP will automatically run on all interfaces.
For details, see "Configuring Common Multicast " on page 196.
Enabling IGMP on an Interface
You must enable multicast before you can execute the igmp enable command.
After this, you can initiate the IGMP feature configuration.
Perform the following configuration in VLAN interface view.
Enable/Disable IGMP on an Interface
Table 8
Operation
Enable IGMP on an interface
Disable IGMP on an interface
By default, IGMP is not enabled.
Configuring the IGMP Version
Perform the following configuration in VLAN interface view.
Select the IGMP Version
Table 9
Operation
Select the IGMP version that the router uses
Restore the default setting
The default is IGMP Version 2.
All routers on a subnet must support the same version of IGMP. After detecting
the presence of IGMP Version 1 system, a router cannot automatically switch to
Version 1.
Configuring the Interval for Sending the IGMP Group-Specific Query
Packet
In the shared network, where the same network segment includes multiple hosts
and multicast routers, the query router is responsible for maintaining the IGMP
group membership on the interface.
When the IGMP v2 host leaves a group, it sends an IGMP Group Leave message.
When the IGMP query router receives the IGMP Leave message, it must send the
IGMP group query message for the specified number of times ( the robust-value
parameter in the igmp robust-count command, with a default value of 2) in a
specified time interval (the seconds parameter in the igmp
lastmember-queryinterval command, with a default value of 1 second).
Command
igmp enable
undo igmp enable
Command
igmp version { 2 | 1 }
undo igmp version