auto-frr lsp-trigger (MPLS-LDP-IPv4 view)

Function

The auto-frr lsp-trigger command configures a policy for establishing backup LDP label switched paths (LSPs) over backup routes.

The undo auto-frr lsp-trigger command restores the default policy.

By default, LDP uses backup routes with 32-bit addresses to establish backup LSPs.

Format

auto-frr lsp-trigger { none | host | all | ip-prefix ip-prefix-name }

undo auto-frr lsp-trigger

Parameters

Parameter	Description	Value
none	Uses none of the backup routes to establish backup LDP LSPs.	-
host	Uses backup routes with 32-bit addresses to establish backup LDP LSPs.	-
all	Uses all backup routes to establish backup LDP LSPs.	-
ip-prefix ip-prefix-name	Uses backup routes with a specified IP address prefix to establish backup LDP LSPs.	The name is a string of 1 to 169 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string.

Views

MPLS-LDP-IPv4 view, MPLS-LDP-VPN-IPv4 view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mpls-ldp	write

Usage Guidelines

Usage Scenario

LDP Auto fast reroute (FRR) depends on Interior Gateway Protocol (IGP) Auto FRR or static route FRR. LDP Auto FRR will be automatically enabled after IGP Auto FRR is enabled using the frr (IS-IS) command in the IS-IS view or the frr (OSPF) command in the OSPF view, or after static route FRR is enabled using the ip route-static frr command. To configure or change a policy for triggering LDP LSP establishment, run the auto-frr lsp-trigger command.

Prerequisites

MPLS LDP has been enabled globally using the mpls ldp command in the system view.

If ip-prefix is to be used, an IP prefix list must have been created using the ip ip-prefix command.

Precautions

If both the auto-frr lsp-trigger command and the lsp-trigger command are run, the established backup LSPs are controlled by the intersection part of the policy for triggering LDP LSP establishment and the policy for triggering backup LDP LSP establishment. For example, if the policies are set to "none" and "all", the "none" policy takes effect.

The auto-frr lsp-trigger command takes effect in either the MPLS-LDP view or MPLS LDP IPv4 view. If the command is configured in both views, only the latter configuration takes effect.

Example

# Configure LDP to use none of the backup routes to establish backup LSPs.

<HUAWEI> system-view
[~HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls ldp
[*HUAWEI-mpls-ldp] ipv4-family
[*HUAWEI-mpls-ldp-ipv4] auto-frr lsp-trigger none