Adjusting Mld Performance; Configuration Prerequisites; Configuring Router-Alert Option Handling Methods - HP MSR ASM Configuration Manual

Step
3. Configure the maximum number of
IPv6 multicast groups that the
interface can join.

Adjusting MLD performance

For the configuration tasks in this section, the following rules apply:
The configurations made in MLD view are effective on all interfaces. The configurations in interface
•
view are effective only on the current interface.
A configuration made in interface view always has priority over the same configuration in MLD view,
•
regardless of the configuration sequence.

Configuration prerequisites

Before adjusting MLD performance, complete the following tasks:
• Enable IPv6 forwarding and configure an IPv6 unicast routing protocol so that all devices in the
domain can be interoperable at the network layer.
Configure basic MLD functions.
•
Determine the startup query interval.
•
• Determine the startup query count.
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 Router-Alert option handling methods

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 21 13.
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.
Command
mld group-limit limit
279
Remarks
The default value varies with
devices. For more
information, see IP Multicast
Command Reference.
This configuration only limits
the number of IPv6 multicast
groups that the interface
dynamically joins.