erps ring track cfm

Function

The erps ring track cfm command associates ERPS with Ethernet Connectivity Fault Management (CFM) to promptly detect link failures.

The undo erps ring track cfm command deletes the association between ERPS and Ethernet CFM.

By default, ERPS is not associated with Ethernet CFM.

Format

erps ring ring-id track cfm md md-name ma ma-name mep mep-id remote-mep rmep-id

undo erps ring ring-id track cfm

Parameters

Parameter	Description	Value
md md-name	Specifies the name of a maintenance domain (MD).	The value is a string of 1 to 43 case-sensitive characters, spaces, hyphens (-), and question marks (?) not supported. Different MDs on a device cannot have the same name.
ma ma-name	Specifies the name of a maintenance association (MA).	The value is a string of 1 to 43 case-sensitive characters, spaces, hyphens (-), and question marks (?) not supported. The total length of the MA and MD names cannot exceed 44 characters.
mep mep-id	Specifies the ID of a maintenance association end point (MEP).	The value is an integer ranging from 1 to 8191.
remote-mep rmep-id	Specifies the ID of a remote maintenance association end point (RMEP).	The value is an integer ranging from 1 to 8191.
ring ring-id	Specifies the ID of an ERPS ring.	The value is an integer ranging from 1 to 255.

Views

Layer 2 100GE interface view, Layer 2 10GE interface view, 25GE-L2 view, 400GE-L2 view, Layer 2 40GE interface view, Layer 2 50GE interface view, Eth-Trunk interface view, Layer 2 GE interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
erps	write

Usage Guidelines

Usage Scenario

To promptly detect failures, converge topologies, and shorten the traffic interruption time, associate ERPS with Ethernet CFM on an ERPS ring port.

Prerequisites

Before associating ERPS with Ethernet CFM on an ERPS ring port, ensure that:

Spanning Tree Protocol (STP) is not enabled on the port. If the port has STP enabled, run the stp disable command in the interface view to disable STP.
The port is not a Layer 3 port. If the port is a Layer 3 port, run the portswitch command to switch the port to the Layer 2 mode.
The ERPS ring specified by ring ring-id must be the one to which the port belongs.
Ethernet CFM has not been applied to other ports on the ring, and CFM entities have been created.

Precautions

This command is supported in both ERPSv1 and ERPSv2.
Currently, ERPS can be associated only with outward-facing MEPs.
The association between ERPS and CFM takes effect only when the interface has ERPS associated with CFM and has an interface-based MEP created using the mep mep-id command.
If the undo erps track cfm command is run on an ERPS ring port that associates ERPS with CFM and is in the Forwarding state, the port's status will switch to Discarding to ensure ERPS ring proper forwarding. If the ERPS ring is in switchback mode, the WTR timer starts, and the status of the port switches back before the timer expires.
After the erps track cfm command is run, to ensure traffic forwarding, run the alarm occur time time and alarm finish time time commands, respectively, to set the alarm generation anti-jitter time and alarm clearing anti-jitter time to 0.

Example

# Associate ERPS with Ethernet CFM on GE 0/1/1.

<HUAWEI> system-view
[~HUAWEI] cfm enable
[*HUAWEI] cfm md md1
[*HUAWEI-md-md1] ma ma1
[*HUAWEI-md-md1-ma-ma1] mep mep-id 1 interface GigabitEthernet 0/1/1 outward
[*HUAWEI-md-md1-ma-ma1] remote-mep mep-id 2
[*HUAWEI-md-md1-ma-ma1] quit
[*HUAWEI-md-md1] quit
[*HUAWEI] erps ring 5
[*HUAWEI-erps-ring5] protected-instance all
[*HUAWEI-erps-ring5] control-vlan 10
[*HUAWEI-erps-ring5] quit
[*HUAWEI] interface GigabitEthernet 0/1/1
[*HUAWEI-GigabitEthernet0/1/1] portswitch
[*HUAWEI-GigabitEthernet0/1/1] stp disable
[*HUAWEI-GigabitEthernet0/1/1] erps ring 5
[*HUAWEI-GigabitEthernet0/1/1] erps ring 5 track cfm md md1 ma ma1 mep 1 remote-mep 2