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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 34 MPLS Traffic Engineering - Fast Reroute Link Protection
How to Configure Traffic Engineering - Fast Reroute Link Protection
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
Step 6
mpls traffic-eng auto-tunnel backup
timers removal unused
sec
Example:
Router(config)# mpls traffic-eng
auto-tunnel primary timers removal
rerouted 604800
Configures how frequently a timer scans the backup autotunnels and
remove tunnels that are not being used.
• sec—Configures (in seconds) the timer scan interval. The range
is 0 to 604,800.
Step 7
mpls traffic-eng auto-tunnel backup
config unnumbered-interface
interface
Example:
Router(config)# mpls traffic-eng
auto-tunnel backup config
unnumbered-interface Loopback0
Configures a specific unnumbered interface for all backup
auto-tunnels.
• interface—Interface for all backup auto-tunnels. Default
interface is Loopback0.
Command Purpose