Configuring an MLD Snooping Policy 593
n
When enabled to filter IPv6 multicast data based on the source ports, the device is
automatically enabled to filter IPv4 multicast data based on the source ports.
Configuring Dropping
Unknown IPv6 Multicast
Data
Unknown IPv6 multicast data refers to IPv6 multicast data for which no forwarding
entries exist in the MLD Snooping forwarding table: When the switch receives
such IPv6 multicast traffic:
■ With the function of dropping unknown IPv6 multicast data enabled, the
switch drops all unknown IPv6 multicast data received.
■ With the function of dropping unknown IPv6 multicast data disabled, the
switch floods unknown IPv6 multicast data in the VLAN to which the unknown
IPv6 multicast data belongs.
Follow these steps to enable dropping unknown IPv6 multicast data in a VLAN:
n
When enabled to drop unknown IPv6 multicast data, the device is automatically
enabled to drop unknown IPv4 multicast data.
Configuring MLD Report
Suppression
When a Layer 2 device receives an MLD report from an IPv6 multicast group
member, the Layer 2 device forwards the message to the Layer 3 device directly
connected with it. Thus, when multiple members belonging to an IPv6 multicast
group exist on the Layer 2 device, the Layer 3 device directly connected with it will
receive duplicate MLD reports from these members.
With the MLD report suppression function enabled, within a query interval, the
Layer 2 device forwards only the first MLD report of an IPv6 group to the Layer 3
device and will not forward the subsequent MLD reports from the same multicast
group to the Layer 3 device. This helps reduce the number of packets being
transmitted over the network.
Follow these steps to configure MLD report suppression:
To do… Use the command… Remarks
Enter system view system-view -
Enter the
corresponding view
Enter Ethernet
port view
interface interface-type
interface-number
Use either command
Enter port group
view
port-group { manual
port-group-name |
aggregation agg-id }
Enable IPv6 multicast source port filtering mld-snooping
source-deny
Required
Disabled by default
To do… Use the command… Remarks
Enter system view system-view -
Enter VLAN view vlan vlan-id -
Enable dropping unknown
IPv6 multicast data
mld-snooping
drop-unknown
Required
Disabled by default
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