3Com Switch 8800 Advanced Software V5 Configuration Guide

658 CHAPTER 45: MLD SNOOPING CONFIGURATION
Configuring the fast leave feature globally
Follow these steps to configure the fast leave feature globally:
Configuring the fast leave feature on a port or a group ports
Follow these steps to configure the fast leave feature on a port or a group ports:
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CAUTION: If the fast leave feature is enabled on a port to which more than one
host is connected, when one host leaves an IPv6 multicast group, the other hosts
connected to port and interested in the same IPv6 multicast group will fail to
receive IPv6 multicast data addressed to that group.
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 MLD Snooping view mld-snooping -
Enable the fast leave feature fast-leave [ vlan vlan-list ] Required
Disabled by default
To do... Use the command... Remarks
Enter system view system-view -
Enter the
corresponding view
Enter Ethernet
interface view
interface
interface-type
interface-number
Use either command
Enter port group view port-group { manual
port-group-name |
aggregation agg-id }
Enable the fast leave feature mld-snooping
fast-leave [ vlan
vlan-list ]
Required
Disabled by default
To do... Use the command... Remarks
Enter system view system-view -
Enter MLD Snooping view mld-snooping -
Enable MLD report
suppression
report-aggregation Optional
Enabled by default