Delivery Of Packets During A Failure; Multiple Backup Tunnels Protecting The Same Interface; Srlg Limitations - Cisco CRS Configuration Manual
Ios xr mpls configuration guide
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MPLS Traffic Engineering Shared Risk Link Groups
Related Topics
Configuring the SRLG Values of Each Link that has a Shared Risk with Another Link, on page 294
Creating an Explicit Path With Exclude SRLG, on page 296
Using Explicit Path With Exclude SRLG, on page 298
Creating a Link Protection on Backup Tunnel with SRLG Constraint, on page 300
Creating a Node Protection on Backup Tunnel with SRLG Constraint, on page 303
Configure the MPLS-TE Shared Risk Link Groups: Example, on page 353
Delivery of Packets During a Failure
Backup tunnels that terminate at the NNHOP protect both the downstream link and node. This provides
protection for link and node failures.
Related Topics
Configuring the SRLG Values of Each Link that has a Shared Risk with Another Link, on page 294
Creating an Explicit Path With Exclude SRLG, on page 296
Using Explicit Path With Exclude SRLG, on page 298
Creating a Link Protection on Backup Tunnel with SRLG Constraint, on page 300
Creating a Node Protection on Backup Tunnel with SRLG Constraint, on page 303
Configure the MPLS-TE Shared Risk Link Groups: Example, on page 353
Multiple Backup Tunnels Protecting the Same Interface
• Redundancy—If one backup tunnel is down, other backup tunnels protect LSPs.
• Increased backup capacity—If the protected interface is a high-capacity link and no single backup path
exists with an equal capacity, multiple backup tunnels can protect that one high-capacity link. The LSPs
using this link falls over to different backup tunnels, allowing all of the LSPs to have adequate bandwidth
protection during failure (rerouting). If bandwidth protection is not desired, the router spreads LSPs
across all available backup tunnels (that is, there is load balancing across backup tunnels).
Related Topics
Configuring the SRLG Values of Each Link that has a Shared Risk with Another Link, on page 294
Creating an Explicit Path With Exclude SRLG, on page 296
Using Explicit Path With Exclude SRLG, on page 298
Creating a Link Protection on Backup Tunnel with SRLG Constraint, on page 300
Creating a Node Protection on Backup Tunnel with SRLG Constraint, on page 303
Configure the MPLS-TE Shared Risk Link Groups: Example, on page 353
SRLG Limitations
There are few limitations to the configured SRLG feature:
• The exclude-address and exclude-srlg options are not allowed in the IP explicit path strict-address
network.
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
202
Implementing MPLS Traffic Engineering
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