Configuring Next Hop Backup Tunnel - Cisco NCS 5500 Series Configuration Manual

Implementing MPLS Traffic Engineering
• Protection is expanded—FRR does not protect IP traffic that is not using the TE tunnel or Label
Distribution Protocol (LDP) labels that are not using the TE tunnel.
The TE attribute-set template that specifies a set of TE tunnel attributes, is locally configured at the headend
of auto-tunnels. The control plane triggers the automatic provisioning of a corresponding TE tunnel, whose
characteristics are specified in the respective attribute-set.
Configuration Example
This example configures Auto-Tunnel backup on an interface and specifies the attribute-set template for the
auto tunnels. In this example, unused backup tunnels are removed every 20 minutes using a timer and also
the range of tunnel interface numbers are specified.
RP/0/RP0/CPU0:router # configure
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)# auto-tunnel backup
RP/0/RP0/CPU0:router(config-mpls-te-if-auto-backup)# attribute-set ab
RP/0/RP0/CPU0:router(config-mpls-te)# auto-tunnel backup timers removal unused 20
RP/0/RP0/CPU0:router(config-mpls-te)# auto-tunnel backup tunnel-id min 6000 max 6500
RP/0/RP0/CPU0:router(config)# commit
Verification
This example shows a sample output for automatic backup tunnel configuration.
RP/0/RP0/CPU0:router# show mpls traffic-eng tunnels brief
Related Topics
• Configuring Fast Reroute , on page 41
• Configuring Next Hop Backup Tunnel, on page 43
• MPLS-TE Features - Details, on page 51

Configuring Next Hop Backup Tunnel

The backup tunnels that bypass only a single link of the LSP path are referred as Next Hop (NHOP) backup
tunnels because they terminate at the LSP's next hop beyond the point of failure. They protect LSPs, if a link
along their path fails, by rerouting the LSP traffic to the next hop, thus bypassing the failed link.
Configuration Example
This example configures next hop backup tunnel on an interface and specifies the attribute-set template for
the auto tunnels. In this example, unused backup tunnels are removed every 20 minutes using a timer and also
the range of tunnel interface numbers are specified.
RP/0/RP0/CPU0:router # configure
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)# auto-tunnel backup nhop-only
TUNNEL NAME DESTINATION
tunnel-te0 200.0.0.3
tunnel-te1 200.0.0.3
tunnel-te2 200.0.0.3
tunnel-te50 200.0.0.3
*tunnel-te60 200.0.0.3
*tunnel-te70 200.0.0.3
*tunnel-te80 200.0.0.3
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
Configuring MPLS-TE
STATUS STATE
up up
up up
up up
up up
up up
up up
up up
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