Example for Configuring Fast Leave for Interfaces

Networking Requirements

In Figure 1, the router is connected to the user network through the Layer 2 switch on an IPv6 network. GE0/0/1 and GE0/0/2 on the switch connect to only one receiver host. Therefore, when receiving MLD Done messages from the two interfaces, the switch can delete the forwarding entries of the multicast group that the hosts have left, without waiting the aging timer to time out. This saves the bandwidth and system resources.

Figure 1 Network diagram for fast leave configuration

Configuration Roadmap

Enabling MLD snooping and configuring prompt leave for interfaces on the switch can meet the requirements.

Create a VLAN and add interfaces to the VLAN.
Enable MLD snooping globally and in the VLAN.
Enable prompt leave for interfaces in the VLAN.

Procedure

Create VLAN 10 and add interfaces to VLAN 10.

<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] vlan 10
[Switch-vlan10] quit
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] port link-type hybrid
[Switch-GigabitEthernet0/0/1] port hybrid pvid vlan 10
[Switch-GigabitEthernet0/0/1] port hybrid untagged vlan 10
[Switch-GigabitEthernet0/0/1] quit
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] port link-type hybrid
[Switch-GigabitEthernet0/0/2] port hybrid pvid vlan 10
[Switch-GigabitEthernet0/0/2] port hybrid untagged vlan 10
[Switch-GigabitEthernet0/0/2] quit
[Switch] interface gigabitethernet 0/0/3
[Switch-GigabitEthernet0/0/3] port link-type hybrid
[Switch-GigabitEthernet0/0/3] port hybrid pvid vlan 10
[Switch-GigabitEthernet0/0/3] port hybrid untagged vlan 10
[Switch-GigabitEthernet0/0/3] quit

Enable MLD snooping globally and in VLAN 10.
# Enable MLD snooping globally.
```
[Switch] mld-snooping enable
```
# Enable MLD snooping in VLAN 10.
```
[Switch] vlan 10
[Switch-vlan10] mld-snooping enable
```

Configure fast leave for interfaces in VLAN 10.

[Switch-vlan10] mld-snooping prompt-leave
[Switch-vlan10] quit

Verify the configuration.

# Run the display mld-snooping command on the Switch to check VLAN 10 configuration.

[Switch] display mld-snooping vlan 10
MLD Snooping Vlan Information for VLAN 10
   MLD Snooping is Enabled
   MLD Version is Set to default 1
   MLD Query Interval is Set to default 125s
   MLD Max Response Interval is Set to default 10s
   MLD Robustness is Set to default 2
   MLD Last Member Query Interval is Set to default 1s
   MLD Router Port Aging Interval is Set to 180s or holdtime in hello
   MLD Filter Group-Policy is not set
   MLD Prompt Leave Enable
   MLD Router Alert is Not Required
   MLD Send Router Alert Enable
   MLD Snooping proxy is disabled
   MLD Snooping report-suppress is disabled
   MLD Snooping Querier is disabled

MLD Prompt Leave Enable in the command output indicates that the fast leave configuration in VLAN 10 is successful.

Configuration Files

Switch configuration file

#
sysname Switch
#
vlan batch 10
#
mld-snooping enable
#
vlan 10
 mld-snooping enable
 mld-snooping prompt-leave
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 10
 port hybrid untagged vlan 10
#
interface GigabitEthernet0/0/2
 port link-type hybrid
 port hybrid pvid vlan 10
 port hybrid untagged vlan 10
#
interface GigabitEthernet0/0/3
 port link-type hybrid
 port hybrid pvid vlan 10
 port hybrid untagged vlan 10
#
return