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

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