HP A5500 SI Switch Series User Manual

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• 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 device cannot maintain the information for all multicast sources and groups.
For this reason, when an IGMP router receives a multicast packet but cannot locate the outgoing
interface for the destination multicast group, it must leverage 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 device does not check 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 device performance and avoid unnecessary costs, and also for the consideration of
protocol security, 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:
To do... Use the command... Remarks
Enter system view system-view —
Enter public network IGMP view
or VPN instance IGMP view
igmp [ vpn-instance vpn-instance-
name ]
—
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 insertion of the Router-Alert
option into IGMP messages
send-router-alert
Optional
By default, IGMP messages carry
the Router-Alert option.
Configuring IGMP packet options on an interface
Follow these steps to configure IGMP packet options on an interface:
To do... Use the command... Remarks
Enter system view system-view —
Enter interface view
interface interface-type interface-
number
—

HP A5500 SI Switch Series Specifications

General

Brand	HP
Model	A5500 SI Switch Series
Category	Switch
Language	English