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Configuring an MLD snooping policy
Before you configure an MLD snooping policy, complete the following tasks:
• Enable MLD snooping in the VLAN.
• Determine the IPv6 ACL rule for IPv6 multicast group filtering.
• Determine the maximum number of IPv6 multicast groups that a port can join.
• Determine the 802.1p precedence for MLD messages.
Configuring an IPv6 multicast group filter
On an MLD snooping–enabled switch, you can configure an IPv6 multicast group filter to limit multicast
programs available to users.
In an application, when a user requests a multicast program, the user's host initiates an MLD report. After
receiving this report message, the switch resolves the IPv6 multicast group address in the report and looks
up the ACL. If a match is found to permit the port that received the report to join the IPv6 multicast group,
the switch creates an MLD snooping forwarding entry for the IPv6 multicast group and adds the port to
the forwarding entry. Otherwise, the switch drops this report message, in which case, the IPv6 multicast
data for the IPv6 multicast group is not sent to this port, and the user cannot retrieve the program.
When you configure a multicast group filter in an IPv6 multicast VLAN, be sure to configure the filter in
the sub-VLANs of the IPv6 multicast VLAN. Otherwise, the configuration does not take effect.
In an IPv6 network that runs MLDv2, when a host joins multiple multicast groups, the multicast group filter
cannot correctly filter multicast groups because the host that runs MLDv2 sends multiple multicast groups
that it wants to join in one membership report.
Configuring an IPv6 multicast group globally
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter MLD-snooping view.
mld-snooping N/A
3. Configure an IPv6 multicast
group filter.
group-policy acl6-number [ vlan
vlan-list ]
By default, no IPv6 group filter is
globally configured. That is, the
hosts in a VLAN can join any valid
multicast group.
Configuring an IPv6 multicast group filer for a port
Ste
Command
Remarks
1. Enter system view.
system-view N/A
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