Configuring Igmp Message Options - HP A6600 Configuration Manual

Determine the startup query interval
•
Determine the startup query count
•
Determine the IGMP general query interval
•
Determine the IGMP querier's robustness variable
•
Determine the maximum response time for IGMP general queries
•
Determine the IGMP last-member query interval
•
Determine the other querier present interval
•

Configuring IGMP message options

IGMP queries include group-specific queries and group-and-source-specific queries, and multicast groups
change dynamically, so a router cannot maintain the information for all multicast sources and groups. For
this reason, when an IGMP-capable router receives a multicast packet but cannot locate the outgoing
interface for the destination multicast group, it must use the Router-Alert option to pass the multicast packet
to the upper-layer protocol for processing. For more information about the Router-Alert option, see RFC
2113.
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 router does not verify the Router-Alert option. It
processes all the IGMP messages that it received. In this case, IGMP messages are directly passed to
the upper layer protocol, whether the IGMP messages carry the Router-Alert option or not.
To enhance the router's performance and avoid unnecessary costs, and also for the consideration of
•
protocol security, you can configure the router to discard IGMP messages that do not carry the
Router-Alert option.
Configuring IGMP packet options globally
To do...
1. Enter system view.
2. Enter public network IGMP
view or VPN instance IGMP
view.
3. Configure the router to
discard any IGMP message
that does not carry the
Router-Alert option.
4. Enable insertion of the
Router-Alert option into IGMP
messages.
Configuring IGMP packet options on an interface
To do...
1. Enter system view.
2. Enter interface view.
Use the command...
system-view
igmp [ vpn-instance
vpn-instance-name ]
require-router-alert
send-router-alert
Use the command...
system-view
interface interface-type
interface-number
74
Remarks
—
—
Optional.
By default, the router does not
check the Router-Alert option.
Optional.
By default, IGMP messages carry
the Router-Alert option.
Remarks
—
—