HP A5500 SI Switch Series User Manual

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• Determine the maximum response delay of MLD general query messages
• Determine the MLD last listener query interval
• Determine the MLD other querier present interval
Configuring MLD message options
MLD queries include multicast-address-specific queries and multicast-address-and-source-specific queries,
and IPv6 multicast groups change dynamically, so a device cannot maintain the information for all IPv6
multicast sources and groups. Therefore, a router might receive IPv6 multicast packets addressed to IPv6
multicast groups that have no members on the local subnet. In this case, the Router-Alert option carried in
the IPv6 multicast packets is useful for the router to determine whether to deliver the IPv6 multicast
packets to the upper-layer protocol for processing. For more information about the Router-Alert option,
see RFC 2113.
An MLD message is processed differently depending on whether it carries the Router-Alert option in the
IPv6 header, as follows:
• For compatibility, the device by default ignores the Router-Alert option and processes all received
MLD messages, no matter whether the MLD messages carry the Router-Alert option or not.
• To enhance device performance, avoid unnecessary costs, and ensure protocol security, configure
the device to discard MLD messages that do not carry the Router-Alert option.
Configuring the Router-Alert option for MLD messages globally
Follow these steps to configure the Router-Alert option for MLD messages globally:
To do… Use the command… Remarks
Enter system view system-view —
Enter MLD view mld —
Configure the interface to discard
any MLD message without the
Router-Alert option
require-router-alert
Optional
By default, the device does not
check MLD messages for the
Router-Alert option.
Enable the insertion of the Router-
Alert option into MLD messages
send-router-alert
Optional
By default, MLD messages carry
the Router-Alert option.
Configuring the Router-Alert option on an interface
Follow these steps to configure the Router-Alert option on an interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type interface-
number
—
Configure the interface to discard
any MLD message without the
Router-Alert option
mld require-router-alert
Optional
By default, the device does not
check MLD messages for the
Router-Alert option.

HP A5500 SI Switch Series Specifications

General

Brand	HP
Model	A5500 SI Switch Series
Category	Switch
Language	English