lsp-loopback

Function

The lsp-loopback start command enables loopback detection for a specified static bidirectional co-routed CR-LSP on a transit node.

The lsp-loopback stop command disables loopback detection for a static bidirectional co-routed CR-LSP.

By default, loopback detection for a specified static bidirectional co-routed CR-LSP on a transit node is not enabled.

Format

lsp-loopback { start | stop }

Parameters

Parameter	Description	Value
start	Specifies to enable loopback detection for a specified static bidirectional co-routed CR-LSP on a transit node.	-
stop	Specifies to disable loopback detection for a static bidirectional co-routed CR-LSP.	-

Parameter

Description

Value

start

Specifies to enable loopback detection for a specified static bidirectional co-routed CR-LSP on a transit node.

stop

Specifies to disable loopback detection for a static bidirectional co-routed CR-LSP.

Views

Static bidirectional co-routed transit view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mpls-te	write

Usage Guidelines

Usage Scenario

To enable loopback detection for a static bidirectional co-routed CR-LSP, run the lsp-loopback start command on a transit node. The command output helps diagnose minor packet loss and bit errors on the static bidirectional co-routed CR-LSP. After the lsp-loopback start command is run, the loopback detection-enabled node loops traffic back to the ingress through a temporary loop, which adversely affects traffic transmission. After you locate faults, immediately run the lsp-loopback stop command to disable loopback detection to restore service transmission.

Example

# Disable loopback detection on a transit node of a static bidirectional co-routed CR-LSP.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] mpls te
[*HUAWEI-mpls] quit
[*HUAWEI] bidirectional static-cr-lsp transit lsp1
[*HUAWEI-bi-static-transit-lsp1] forward in-label 20 nexthop 10.1.1.1 out-label 30
[*HUAWEI-bi-static-transit-lsp1] backward in-label 60 nexthop 10.2.1.1 out-label 80
[*HUAWEI-bi-static-transit-lsp1] lsp-loopback start
[*HUAWEI-bi-static-transit-lsp1] lsp-loopback stop