Configuring Mld Message Options - HP A5500 SI Switch Series Configuration Manual

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...
Enter system view
Enter MLD view
Configure the interface to discard
any MLD message without the
Router-Alert option
Enable the insertion of the Router-
Alert option into MLD messages
Configuring the Router-Alert option on an interface
Follow these steps to configure the Router-Alert option on an interface:
To do...
Enter system view
Enter interface view
Configure the interface to discard
any MLD message without the
Router-Alert option
Use the command...
system-view
mld
require-router-alert
send-router-alert
Use the command...
system-view
interface interface-type interface-
number
mld require-router-alert
312
Remarks
—
—
Optional
By default, the device does not
check MLD messages for the
Router-Alert option.
Optional
By default, MLD messages carry
the Router-Alert option.
Remarks
—
—
Optional
By default, the device does not
check MLD messages for the
Router-Alert option.