Chapter 34 MPLS Traffic Engineering - Fast Reroute Link Protection

How to Configure Traffic Engineering - Fast Reroute Link Protection

 

Command

Purpose

 

 

 

Step 6

mpls traffic-eng auto-tunnel backup

Configures how frequently a timer scans the backup autotunnels and

 

timers removal unused sec

remove tunnels that are not being used.

 

Example:

sec—Configures (in seconds) the timer scan interval. The range

 

is 0 to 604,800.

 

Router(config)# mpls traffic-eng

 

 

auto-tunnel primary timers removal

 

 

rerouted 604800

 

 

 

 

Step 7

mpls traffic-eng auto-tunnel backup

Configures a specific unnumbered interface for all backup

 

config unnumbered-interface interface

auto-tunnels.

 

Example:

interface—Interface for all backup auto-tunnels. Default

 

interface is Loopback0.

 

Router(config)# mpls traffic-eng

 

 

auto-tunnel backup config

 

 

unnumbered-interface Loopback0

 

 

 

 

Enabling Targeted LDP session over Primary one-hop Auto-Tunnels

An MPLS LDP targeted session is a label distribution session between routers that are not directly connected. When you create an MPLS TE tunnel interface, you need to establish a label distribution session between the tunnel headend and the tailend routers. You establish non-directly connected MPLS LDP sessions by enabling the transmission of targeted Hello messages.

The default behavior of an LSR is to ignore requests from other LSRs that send targeted Hello messages. You can configure an LSR to respond to requests for targeted Hello messages by using the

mpls ldp discovery targeted-hello accept command.

The active LSR mandates the protocol that is used for a targeted session. The passive LSR uses the protocol of the received targeted Hello messages.

To enable targeted LDP sessions over primary one-hop auto-tunnels, perform the steps given below:

Note For targeted mpls session, the head end tunnel should have “mpls ip” configuration.

SUMMARY STEPS

1.enable

2.configure terminal

3.mpls ldp discovery targeted-hello accept

 

Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide

34-14

OL-23826-09

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Cisco Systems A9014CFD manual Mpls ldp discovery targeted-hello accept command, 34-14