l2-multicast ipv6 fast-channel

Format

l2-multicast ipv6 fast-channel [ source-address source-address SrcAddrMaskLen ] group-address group-address GrpAddrMaskLen

undo l2-multicast ipv6 fast-channel [ source-address source-address SrcAddrMaskLen ] group-address group-address GrpAddrMaskLen

Parameters

Parameter	Description	Value
source-address source-address	Specifies a multicast source address.	The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X.
SrcAddrMaskLen	Specifies the mask length for the source address.	The value is an integer ranging from 64 to 128.
group-address group-address	Specifies a multicast group IP address.	The value is a 32-digit hexadecimal number, in the format of X:X:X:X:X:X:X:X. The value ranges from FF00::0 to FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF.
GrpAddrMaskLen	Specifies the mask length for the group address.	The value is an integer ranging from 64 to 128.

Views

VLAN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2mc	write

Usage Guidelines

Usage Scenario

After receiving the first MLD Report for a multicast group, the device needs to apply for resources for this group and then generates a forwarding entry. This decreases the speed at which hosts join the multicast group. To speed up host join, run the l2-multicast ipv6 fast-channel command to enable prompt join. With this function enabled, the device applies for resources for multicast groups in advance. When the device receives an MLD Report message for a multicast group, it can immediately forward multicast data for the multicast group, shortening the delay for the device to respond to the Report message.

Configuration Impact

If the device has reserved resources for a multicast group but does not receive an MLD Report message for this multicast group for a long period of time, resources will be wasted and device performance will be degraded.

Example

# Enable prompt join in VLAN 10.

<HUAWEI> system-view
[~HUAWEI] mld-snooping enable
[*HUAWEI] vlan 10
[*HUAWEI-vlan10] l2-multicast ipv6 fast-channel source-address 1::128 128 group-address ff15::1 128