Adjusting IGMP Performance 621
■ By default, for the consideration of compatibility, the device does not check the
Router-Alert option, namely it processes all the IGMP messages it received. In
this case, IGMP messages are directly passed to the upper layer protocol, no
matter whether the IGMP messages carry the Router-Alert option or not.
■ To enhance the device performance and avoid unnecessary costs, and also for
the consideration of protocol security, you can configure the device to discard
IGMP messages that do not carry the Router-Alert option.
Configuring IGMP packet options globally
Follow these steps to configure IGMP packet options globally:
Configuring IGMP packet options on an interface
Follow these steps to configure IGMP packet options on an interface:
Configuring IGMP Query
and Response
Parameters
The IGMP querier periodically sends IGMP general queries at the “IGMP query
interval” to determine whether any multicast group member exists on the
network. You can tune the IGMP general query interval based on actual condition
of the network.
On startup, the IGMP querier sends “startup query count” IGMP general queries
at the “startup query interval”, which is 1/4 of the “IGMP query interval”. Upon
receiving an IGMP leave message, the IGMP querier sends “last member query
count” IGMP group-specific queries at the “IGMP last member query interval”.
Both startup query count and last member query count are set to the IGMP querier
robustness variable.
To do… Use the command… Description
Enter system view system-view -
Enter IGMP view igmp -
Configure the router to
discard any IGMP message
that does not carry the
Router-Alert option
require-router-alert Optional
By default, the device does
not check the Router-Alert
option.
Enable the insertion of the
Router-Alert option into IGMP
messages
send-router-alert Optional
By default, IGMP messages
carry the Router-Alert option.
To do… Use the command… Description
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Configure the interface to
discard any IGMP message
that does not carry the
Router-Alert option
igmp require-router-alert Optional
By default, the device does
not check the Router-Alert
option.
Enable the insertion of the
Router-Alert option into IGMP
messages
igmp send-router-alert Optional
By default, IGMP messages
carry the Router-Alert option.
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