H3C Technologies H3C S12500-X Series Switches - Manual (Page 128)

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Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VLAN view. vlan vlan-id N/A
3. Enable dropping unknown
IPv6 multicast data for the
VLAN
mld-snooping drop-unknown
By default, this function is disabled.
Unknown IPv6 multicast data is
flooded.
Enabling MLD report suppression
After receiving an MLD report from an IPv6 multicast group member, a Layer 2 switch forwards the MLD
report to the directly connected Layer 3 device. If multiple members of an IPv6 multicast group are
attached to the Layer 2 switch, the Layer 3 device will receive multiple membership reports for the same
IPv6 multicast group.
To reduce the IPv6 multicast traffic, you can enable the MLD report suppression function on the Layer 2
switch. In this way, the Layer 2 switch forwards only the first MLD report for the IPv6 multicast group to the
upstream Layer 3 device during one query interval.
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 for 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 for 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 from the MLD snooping forwarding table. 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:
Step 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