Configuring Mld Message Options - HP A6600 Configuration Manual

• Determine the MLD query interval
• Determine the MLD querier's robustness variable
• 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 router 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:
By default, in consideration of compatibility, the router does not check the Router-Alert option. That
•
is, it processes all received MLD messages. In this case, the router passes MLD messages to the
upper layer protocol for processing, whether the MLD messages carry the Router-Alert option or not.
• To enhance the router's performance, avoid unnecessary costs, and ensure protocol security, you
can configure the router to discard MLD messages that do not carry the Router-Alert option.
Configuring the Router-Alert option for MLD messages globally
To do...
1. Enter system view.
2. Enter MLD view.
3. Configure the interface to
discard any MLD message
without the Router-Alert
option.
4. Enable the insertion of the
Router-Alert option into MLD
messages.
Configuring the Router-Alert option on an interface
To do...
1. Enter system view.
2. Enter interface view.
3. 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
281
Remarks
—
—
Optional.
By default, the router 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 router does not
check MLD messages for the
Router-Alert option.