Huawei AR1200 Series - Displaying System Status Messages

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LDP split horizon policy can be configured to reduce the number of unwanted LSPs and

efficiently use memory.

Procedure

Step 1 Run:

system-view

The system view is displayed.

Step 2 Run:

mpls ldp

The MPLS-LDP view is displayed.

Step 3 Run:

outbound peer { peer-id | all } split-horizon

A split horizon policy is configured to distribute labels to only upstream LDP peers.

By default, split horizon is not enabled and an LSR distributes labels to both upstream and

downstream LDP peers.

In the outbound peer command, configure either of the following parameters to prevent an LSR

from distributing labels to specified downstream peers:

l peer-id: prevents the LSR from distributing labels to a specified downstream peer.

l all: prevents the LSR from distributing labels to all downstream peers.

NOTE

The all parameter takes preference over the peer-id parameter. For example, the outbound peer all split-

horizon and then outbound peer 2.2.2.2 split-horizon commands are run, the outbound peer all split-

horizon command can be saved in the configuration file and take effect, not the outbound peer 2.2.2.2

split-horizon command.

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2.5.9 (Optional) Configuring the Inbound and Outbound LDP

Policies

An inbound LDP policy and an outbound LDP policy can be configured to prevent the

establishment of unwanted LSPs, efficiently using memory.

Context

An LSR is usually able to receive Label Mapping messages from all LDP peers or send Label

Mapping messages to both upstream and downstream LDP peers, speeding up LDP LSP

convergence. This leads to a great number of unwanted LSPs to be established, wasting

resources. An inbound LDP policy can be configured to reduce the number of Label Mapping

messages to be received; an outbound LDP policy can be configured to reduce the number of

Label Mapping messages to be sent. The inbound and outbound LDP policies help reduce the

number of unwanted LSPs to be established and efficiently use memory.

Procedure

l Configure an inbound LDP policy.

Huawei AR1200 Series Enterprise Routers

Configuration Guide - MPLS 2 MPLS LDP Configuration

Issue 01 (2011-12-30) Huawei Proprietary and Confidential

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