H3C S5500-EI - Configuring IGMP Query and Response Parameters

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An IGMP message is processed differently depending on whether it carries the Router-Alert option in the
IP header:
• By default, for the consideration of compatibility, the switch does not verify the Router-Alert option
but processes all the IGMP messages that it received. In this case, IGMP messages are directly
passed to the upper-layer protocol, whether or not the IGMP messages carry the Router-Alert option.
• To enhance the switch performance and avoid unnecessary costs, and also for the consideration of
protocol security, you can configure the switch to discard IGMP messages that do not carry the
Router-Alert option.
Configuring Router-Alert option handling methods globally
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter public network IGMP
view or VPN instance IGMP
view.
igmp [ vpn-instance
vpn-instance-name ]
N/A
3. Configure the router to
discard any IGMP message
that does not carry the
Router-Alert option.
require-router-alert
By default, the switch does not
check the Router-Alert option.
4. Enable insertion of the
Router-Alert option into IGMP
messages.
send-router-alert
By default, IGMP messages carry
the Router-Alert option.
Configuring Router-Alert option handling methods on an interface
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure the interface to
discard any IGMP message
that does not carry the
Router-Alert option.
igmp require-router-alert
By default, the switch does not
check the Router-Alert option.
4. Enable insertion of the
Router-Alert option into IGMP
messages.
igmp send-router-alert
By default, IGMP messages carry
the Router-Alert option.
Configuring IGMP query and response parameters
On startup, the IGMP querier sends IGMP general queries at the startup query interval, which is
one-quarter of the IGMP general query interval. The number of queries, or the startup query count, is user
configurable.