The l2-multicast fast-channel group-address command enables prompt join.
The undo l2-multicast fast-channel group-address command disables prompt join.
By default, prompt join is disabled.
l2-multicast fast-channel [ source-address source-address { SrcAddrMask | SrcAddrMaskLen } ] group-address group-address { GrpAddrMask | GrpAddrMaskLen }
undo l2-multicast fast-channel [ source-address source-address { SrcAddrMask | SrcAddrMaskLen } ] group-address group-address { GrpAddrMask | GrpAddrMaskLen }
| Parameter | Description | Value |
|---|---|---|
| source-address source-address |
Specifies a source address. |
The IP address can be a class A, B, or C address, in dotted decimal notation. |
| SrcAddrMask |
Specifies the mask of a source address. |
The value is in dotted decimal notation. |
| SrcAddrMaskLen |
Specifies the mask length of a source address. |
The value is an integer ranging from 16 to 32. |
| group-address |
Specifies the IP address of a multicast group. |
The value ranges from 224.0.1.0 to 239.255.255.255, in dotted decimal notation. |
| GrpAddrMask |
Specifies the mask of a multicast group address. |
The value is in dotted decimal notation. |
| GrpAddrMaskLen |
Specifies the mask length of a multicast group address. |
The value is an integer ranging from 16 to 32. |
Usage Scenario
After receiving the first IGMP Report for a multicast group, a 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. After the prompt join function is enabled on a device, the device applies for resources for multicast groups in advance. When the device receives an IGMP Report message for a multicast group, it can immediately forward multicast data for the multicast group, increasing the speed at which hosts join the multicast group and shortening the delay for the device to respond to the Report message.
Configuration Impact
If a device has reserved resources for a multicast group but does not receive an IGMP Report message for this multicast group for a long period of time, resources will be wasted and device performance will be degraded.
<HUAWEI> system-view [~HUAWEI] mpls [*HUAWEI-mpls] quit [*HUAWEI] mpls l2vpn [*HUAWEI-l2vpn] quit [*HUAWEI] vsi v1 [*HUAWEI-vsi-v1] pwsignal ldp [*HUAWEI-vsi-v1-ldp] vsi-id 200 [*HUAWEI-vsi-v1-ldp] quit [*HUAWEI-vsi-v1] l2-multicast fast-channel source-address 10.2.2.2 32 group-address 232.0.0.1 32