323
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view or
enter port group view.
•
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view:
interface
interface-type
interface-number
•
Enter port group view:
port-group
manual
port-group-name
Use either approach.
3.
Enable IPv6 multicast group
replacement.
mld-snooping overflow-replace
[
vlan
vlan-list
]
Disabled by default.
Setting the 802.1p precedence for MLD messages
You can change the 802.1p precedence of MLD messages so that they can be assigned higher
forwarding priority when congestion occurs on their outgoing ports.
Setting the 802.1p precedence for MLD messages globally
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter MLD-snooping view.
mld-snooping
N/A
3.
Set the 802.1p precedence
for MLD messages.
dot1p-priority
priority-number
The default 802.1p precedence for
MLD messages is 0.
Setting the 802.1p precedence for MLD messages in a VLAN
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan
vlan-id
N/A
3.
Set the 802.1p precedence
for MLD messages.
mld-snooping dot1p-priority
priority-number
The default 802.1p precedence for
MLD messages is 0.
Configuring an IPv6 multicast user control policy
IPv6 multicast user control policies are configured on access switches to allow only authorized users
to receive requested IPv6 multicast data. This helps restrict users from ordering certain
multicast-on-demand programs.
An IPv6 multicast user control policy is functionally similar to an IPv6 multicast group filter. A
difference is that a control policy can control both multicast joining and leaving of users based on
authentication and authorization, but a multicast group filter is configured on a port to control only
multicast joining of users without authentication or authorization.
In practice, a device first needs to perform authentication (for example, 802.1X authentication) for
the connected hosts through a RADIUS server. Then, the device uses the configured multicast user
control policy to perform multicast access control for authenticated users as follows.
•
After receiving an MLD report from a host, the access switch matches the IPv6 multicast group
address and multicast source address carried in the report with the configured policies. If a
