mpls l2vpn multi-homing trigger cfm

Function

The mpls l2vpn multi-homing trigger cfm command associates CFM with an AC interface's blocked state.

The undo mpls l2vpn multi-homing trigger cfm command restores the default configuration.

By default, CFM is not associated with any AC interface's blocked state.

Format

mpls l2vpn multi-homing trigger cfm md md-name ma ma-name

undo mpls l2vpn multi-homing trigger cfm [ md md-name ma ma-name ]

Parameters

Parameter	Description	Value
ma ma-name	Specifies the name of an MA.	The value is a string of 1 to 43 case-sensitive characters, spaces not supported.
md md-name	Specifies the name of an MD.	The value is a string of 1 to 43 case-sensitive characters, spaces not supported.

Parameter

Description

Value

ma ma-name

Specifies the name of an MA.

The value is a string of 1 to 43 case-sensitive characters, spaces not supported.

md md-name

Specifies the name of an MD.

The value is a string of 1 to 43 case-sensitive characters, spaces not supported.

Views

100ge sub-interface view, 10GE sub-interface view, 200GE sub-interface view, 25GE sub-interface view, 400GE sub-interface view, 40GE sub-interface view, 50GE sub-interface view, Eth-Trunk sub-interface view, FlexE sub-interface view, GE sub-interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2vpn	write

Usage Guidelines

Usage Scenario

In VPLS multi-homing scenarios, CFM is generally deployed between a CE and a PE. If the PE's AC interface is blocked, the CE cannot detect the blocked state and continues sending traffic to the PE, causing a waste of forwarding resources. To associate CFM with the AC interface's blocked state, run the mpls l2vpn multi-homing trigger cfm command on the PE. If the PE's AC interface is blocked, it sends CCMs carrying the blocked state to the CE. Upon receipt, the CE with the cfm md md-name ma ma-name trigger clear-arp command will clear the ARP entries learned from the PE, saving forwarding resources.

Prerequisites

A multi-homing site has been bound to an AC interface using the l2 binding vsi multi-homing-site command.
Basic CFM functions have been configured.

Precautions

In VPLS multi-homing scenarios, CFM applies only to sub-interfaces. Therefore, you must run the mpls l2vpn multi-homing trigger cfm command on sub-interfaces.

Example

# Associate CFM with the blocked state of the AC interface GE 0/1/0.1.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] quit
[*HUAWEI] vsi vsi1
[*HUAWEI-vsi-vsi1] pwsignal bgp multi-homing
[*HUAWEI-vsi-vsi1-bgp] route-distinguisher 192.168.1.1:1
[*HUAWEI-vsi-vsi1-bgp] site name company1
[*HUAWEI-vsi-vsi1-bgp-site-company1] site-id 20
[*HUAWEI-vsi-vsi1-bgp-site-company1] quit
[*HUAWEI-vsi-vsi1-bgp] quit
[*HUAWEI-vsi-vsi1] quit
[*HUAWEI] interface GigabitEthernet 0/1/0.1
[*HUAWEI-GigabitEthernet0/1/0.1] l2 binding vsi multi-homing-site company1
[*HUAWEI-GigabitEthernet0/1/0.1] mpls l2vpn multi-homing trigger cfm md md1 ma ma1