Igmp Configuration Example - 3Com 3032 Configuration Manual

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HAPTER ONFIGURING
Configuring Subnet
Querier Survival Time
Displaying and
Debugging IGMP
IGMP Configuration
Example
IGMP
Restore the default value of IGMP
maximum query response time
The default maximum query response time is 10 seconds but ranges from 1 to 25
seconds.
This configuration can only be carried out if the current router interface is
operating IGMP Version 2.
When there are several routers operating IGMP in a subnet, one router is chosen
to serve as a querier to take charge of sending query messages to other routers in
the network segment. In the network initialization, all the routers in the network
segment act as querier by default, and send general query messages to all the
multicast hosts in the subnet the routers connect to. Meanwhile, they compare
the receiving IP address of the query message interface with the sending IP address
of the query message interface. The router with the minimum IP address in the
subnet will be chosen as querier, and the other routers become non-queriers.
All the non-queriers start the other querier present interval timer. Before the timer
times out, if the query message from the querier is received, the timer resets. If the
timer times out, all the routers reset as querier. The querier selection process
restarts.
Make the following configuration in the interface view.
Table 581 Configure Subnet Querier Survival Time
Operation
Configure subnet Querier survival time
Restore the default value of the subnet
Querier survival time
By default, subnet querier timeout is 250 seconds.
This configuration can only be carried out if the current router interface is
operating IGMP Version 2.
Table 582 Display and Debug IGMP
Operation
Display the group membership status in
the direct connecting subnet
Display IGMP interface configuration
information
Turn on the switch of IGMP debugging
information
After the previous configuration, execute the display command in all views to
display IGMP configuration, and to verify the effect of the configuration. Execute
the debugging command in system view to debug IGMP.
Router A, Router B and a PC connect to one another through a Hub, and their
interfaces are all fast Ethernet (FE).
undo igmp max-response-time
Command
igmp timer querier-present seconds
undo igmp timer querier-present
Command
display igmp group [ group-address |
interface type number ]
display igmp interface [ type number
]
debugging igmp { all | event | host |
packet | timer }