3Com Switch 8800 Advanced Software V5 Configuration Guide

642 CHAPTER 44: MLD CONFIGURATION
Configure an MLD version on an interface
Follow these steps to configure the MLD version on an interface:
Adjusting MLD
Performance
n
For the configuration tasks described in this section,
■ Configurations performed in MLD view are globally effective, while
configurations performed in interface view are effective on the current
interface only.
■ If the same function or parameter is configured in both PIM view and interface
view, the configuration performed in interface view is given priority, regardless
of the configuration sequence.
Configuration
Prerequisites
Before adjusting MLD performance, complete the following tasks:
■ Configure any IPv6 unicast routing protocol so that all devices in the domain
can be interoperable at the network layer.
■ Configure basic functions of MLD.
In addition, prepare the following data:
■ Query interval
■ Maximum response delay of MLD general query messages
■ Other querier present interval
■ Interval for and last listener query count
Configuring MLD
Message Options
MLD involves multicast-address-specific queries, which are specific to particular
IPv6 multicast groups, yet IPv6 multicast groups change dynamically, and a device
cannot join all IPv6 multicast groups. Therefore, a router may 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 make a decision.
Depending on whether an MLD message carries the Router-Alert option in the IP
header, the device processes the message differently. For details about the
Router-Alert option, refer to RFC 2113.
Configure the MLD version
globally
version version-number Optional
MLDv1 by default
To do... Use the command... Remarks
Enter system view system-view -
Enter VLAN interface view interface interface-type
interface-number
-
Configure the MLD version on
the VLAN interface
mld version version-number Optional
MLDv1 by default
To do... Use the command... Remarks