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When the MLD report suppression function is enabled, the Layer 2 switch within a query interval
forwards only the first MLD report for the IPv6 multicast group to the Layer 3 device. It does not forward
subsequent MLD reports for the same IPv6 multicast group to the Layer 3 device, which reduces the
number of packets being transmitted over the network.
To enable MLD report suppression:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter MLD-snooping view.
mld-snooping N/A
3. Enable MLD report
suppression.
report-aggregation
By default, MLD report suppression
is enabled.
Setting the maximum number of IPv6 multicast groups on a port
You can set the maximum number of IPv6 multicast groups on a port to regulate the port traffic.
When you set the maximum number of IPv6 multicast groups on a port, follow these guidelines:
• This configuration takes effect on the IPv6 multicast groups that the port dynamically joins. If you
configure the port as a static member port for an IPv6 multicast group, this configuration does not
take effect on the multicast group.
• If the number of IPv6 multicast groups on a port exceeds the limit, the system removes all the
forwarding entries related to that port. In this case, the receiver hosts attached to that port can join
IPv6 multicast groups again before the number of IPv6 multicast groups on the port reaches the
limit.
To set the maximum number of IPv6 multicast groups on a port:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
N/A
3. Set the maximum number of
IPv6 multicast groups on a
port.
mld-snooping group-limit limit
[ vlan vlan-list ]
The default setting is
4294967295.
Enabling the IPv6 multicast group replacement function
When the number of IPv6 multicast groups on a switch or a port exceeds the limit:
• If the IPv6 multicast group replacement is enabled, the switch or the port replaces an existing IPv6
multicast group with a newly joined IPv6 multicast group.
• If the IPv6 multicast group replacement is disabled, the switch or the port discards MLD reports for
joining a new IPv6 multicast group.
In some specific applications, such as channel switching, a newly joined IPv6 multicast group must
automatically replace an existing IPv6 multicast group. In this case, the function of IPv6 multicast group
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