Configuring Auto-Tunnel Backup - Cisco NCS 5500 Series Configuration Manual

Configuring MPLS-TE
• You must have a router ID for the neighboring router.
• Stable router ID is required at either end of the link to ensure that the link is successful. If you do not
assign a router ID to the routers, the system defaults to the global router ID. Default router IDs are subject
to change, which can result in an unstable link.
Configuration Example
This example configures fast reroute on an MPLS-TE tunnel. Here, tunnel-te 2 is configured as the back-up
tunnel. You can use the protected-by command to configure path protection for an explicit path that is
protected by another path.
RP/0/RP0/CPU0:router # configure
RP/0/RP0/CPU0:router(config)# interface tunnel-te 1
RP/0/RP0/CPU0:router(config-if)# fast-reroute
RP/0/RP0/CPU0:router(config-if)# exit
RP/0/RP0/CPU0:router(config)# mpls traffic-eng
RP/0/RP0/CPU0:router(config-mpls-te)# interface HundredGigabitEthernet 0/0/0/3
RP/0/RP0/CPU0:router(config-mpls-te-if)# backup-path tunnel-te 2
RP/0/RP0/CPU0:router(config)# interface tunnel-te 2
RP/0/RP0/CPU0:router(config-if)# backup-bw global-pool 5000
RP/0/RP0/CPU0:router(config-if)# ipv4 unnumbered Loopback0
RP/0/RP0/CPU0:router(config-if)# destination 192.168.92.125
RP/0/RP0/CPU0:router(config-if)# path-option l explicit name backup-path protected by 10
RP/0/RP0/CPU0:router(config-if)# path-option l0 dynamic
RP/0/RP0/CPU0:router(config)# commit
Verification
Use the show mpls traffic-eng fast-reroute database command to verify the fast reroute configuration.
RP/0/RP0/CPU0:router# show mpls traffic-eng fast-reroute database
Tunnel head FRR information:
Tunnel
----------
tt4000
tt4001
tt4002
Related Topics
• Configuring MPLS-TE, on page 39
• Configuring Auto-Tunnel Backup, on page 42
• Configuring Next Hop Backup Tunnel, on page 43
• MPLS-TE Features - Details, on page 51

Configuring Auto-Tunnel Backup

The MPLS Traffic Engineering Auto-Tunnel Backup feature enables a router to dynamically build backup
tunnels on the interfaces that are configured with MPLS TE tunnels instead of building MPLS-TE tunnels
statically.
The MPLS-TE Auto-Tunnel Backup feature has these benefits:
• Backup tunnels are built automatically, eliminating the need for users to pre-configure each backup
tunnel and then assign the backup tunnel to the protected interface.
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
42
Out intf/label
----------------
HundredGigabitEthernet 0/0/0/3:34
HundredGigabitEthernet 0/0/0/3:35
HundredGigabitEthernet 0/0/0/3:36
Implementing MPLS Traffic Engineering
FRR intf/label Status
---------------- -------
tt1000:34 Ready
tt1001:35 Ready
tt1001:36 Ready