H3C S5500-SI Series, Operation Manual, Page: 449 / 1217

1-11
Configuring fast leave processing on a port or a group of ports
Follow these steps to configure fast leave processing on a port or a group of ports:
To do... Use the command... Remarks
Enter system view system-view —
interface interface-type
interface-number
Enter Ethernet port/Layer 2
aggregate port view or port
group view
port-group manual port-group-name
Required
Use either approach
Enable fast leave processing
mld-snooping fast-leave [ vlan
vlan-list ]
Required
Disabled by default
If fast leave processing 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 Snooping Querier
Configuration Prerequisites
Before configuring MLD Snooping querier, complete the following task:
z
Enable MLD Snooping in the VLAN.
Before configuring MLD Snooping querier, prepare the following data:
z
MLD general query interval,
z
MLD last-member query interval,
z
Maximum response time for MLD general queries,
z
Source IPv6 address of MLD general queries, and
z
Source IPv6 address of MLD multicast-address-specific queries.
Enabling MLD Snooping Querier
In an IPv6 multicast network running MLD, a multicast router or Layer 3 multicast switch is responsible
for sending periodic MLD general queries, so that all Layer 3 multicast devices can establish and
maintain multicast forwarding entries, thus to forward multicast traffic correctly at the network layer. This
router or Layer 3 switch is called MLD querier.
However, a Layer 2 multicast switch does not support MLD, and therefore cannot send MLD general
queries by default. By enabling MLD Snooping querier on a Layer 2 switch in a VLAN where multicast
traffic needs to be Layer-2 switched only and no Layer 3 multicast devices are present, the Layer 2
switch will act as the MLD querier to send periodic MLD queries, thus allowing multicast forwarding
entries to be established and maintained at the data link layer.
Follow these steps to enable the MLD Snooping querier: