HP VPN Firewall Appliances Network Management Configuration Guide

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Configuring MLD
Feature and hardware compatibility
Overview
An IPv6 router uses the MLD protocol to discover the presence of multicast listeners on the directly
attached subnets. Multicast listeners are nodes wishing to receive IPv6 multicast packets.
Through MLD, the router can learn whether any IPv6 multicast listeners exist on the directly connected
subnets, put corresponding records in the database, and maintain timers related to IPv6 multicast
addresses.
Routers that run MLD use an IPv6 unicast link-local address as the source address to send MLD messages.
MLD messages are ICMPv6 messages. All MLD messages are confined to the local subnet, with a hop
count of 1.
The term "router" in this document refers to both routers and routing-capable firewalls.
MLD can be configured only at the CLI.
MLD configuration task list
For the configuration tasks in this section, the following rules apply:
• In MLD view, the configuration is effective globally. In interface view, the configuration is effective
on only the current interface.
• The configurations made in interface view take precedence over those in MLD view. If you do not
make a configuration in interface view, the global configuration in MLD view applies to that
interface.
Complete these tasks to configure MLD:
Task Remarks
Configuring basic MLD functions
Enabling MLD Required.
Configuring the MLD version Optional.
Configuring static joining Optional.
Configuring an IPv6 multicast group filter Optional.
Setting the maximum number of IPv6 multicast
groups that an interface can join
Optional.
Adjusting MLD performance
Configuring Router-Alert option handling methods Optional.
Configuring MLD query and response parameters Optional.
Enabling MLD fast-leave processing Optional.
Enabling the MLD host tracking function Optional.