Configuring Srlg Node Protection; Configuring Pre-Standard Ds-Te - Cisco NCS 5500 Series Configuration Manual

Configuring MPLS-TE
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
Related Topics
• Configuring Auto-Tunnel Backup, on page 42
• Configuring Fast Reroute , on page 41
• MPLS-TE Features - Details, on page 51

Configuring SRLG Node Protection

Shared Risk Link Groups (SRLG) in MPLS traffic engineering refer to situations in which links in a network
share common resources. These links have a shared risk, and that is when one link fails, other links in the
group might fail too.
OSPF and IS-IS flood the SRLG value information (including other TE link attributes such as bandwidth
availability and affinity) using a sub-type length value (sub-TLV), so that all routers in the network have the
SRLG information for each link.
MPLS-TE SRLG feature enhances backup tunnel path selection by avoiding using links that are in the same
SRLG as the interfaces it is protecting while creating backup tunnels.
Configuration Example
This example creates a backup tunnel and excludes the protected node IP address from the explicit path.
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)# backup-path tunnl-te 2
RP/0/RP0/CPU0:router(config-mpls-te-if)# exit
RP/0/RP0/CPU0:router(config)# interface tunnel-te 2
RP/0/RP0/CPU0:router(config-if)# ipv4 unnumbered Loopback0
RP/0/RP0/CPU0:router(config-if)# path-option 1 explicit name backup-srlg
RP/0/RP0/CPU0:router(config-if)# destination 192.168.92.125
RP/0/RP0/CPU0:router(config-if)# exit
RP/0/RP0/CPU0:router(config)# explicit-path name backup-srlg-nodep
RP/0/RP0/CPU0:router(config-if)# index 1 exclude-address 192.168.91.1
RP/0/RP0/CPU0:router(config-if)# index 1 exclude-srlg 192.168.92.2
RP/0/RP0/CPU0:router(config)# commit
Related Topics
• Configuring Fast Reroute , on page 41
• MPLS-TE Features - Details, on page 51

Configuring Pre-Standard DS-TE

Regular traffic engineering does not provide bandwidth guarantees to different traffic classes. A single
bandwidth constraint is used in regular TE that is shared by all traffic. MPLS DS-TE enables you to configure
multiple bandwidth constraints on an MPLS-enabled interface. These bandwidth constraints can be treated
differently based on the requirement for the traffic class using that constraint. Cisco IOS XR software supports
MPLS Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
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Implementing MPLS Traffic Engineering