Cisco CRS Configuration Manual page 182

Release
Release 3.5.0
Release 3.6.0
Release 3.7.0
Release 3.8.0
Release 3.9.0
Release 4.0.0
Release 4.1.0
Release 4.1.1
Release 4.2.0
Release 4.2.1
Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x
164
Modification
Support was added for Unequal Load Balancing, IS-IS IP Fast
Reroute Loop-free Alternative routing functionality, and Path
Computation Element (PCE).
No modification.
Support was added for the following features:
• Ignore Intermediate System-to-Intermediate System (IS-IS)
overload bit setting in MPLS-TE.
• MPLS-TE/Fast Reroute (FRR) over Virtual Local Area
Network (VLAN) interfaces.
Support was added for the following features:
• MPLS-TE Automatic Bandwidth.
• SRLG (Shared Risk Link Groups).
• Policy Based Tunnel Selection (PBTS) IPv6 that includes
the Interior Gateway Protocol (IGP) default path.
The Point-to-Multipoint TE feature was added.
Support was added for the following features:
• AutoTunnel Backup
• SRLG (Shared Risk Link Groups)
Support was added for the following features:
• Ignore Intermediate System-to-Intermediate System
Overload Bit Setting in MPLS-TE
The Auto-Tunnel Mesh feature was added.
Support was added for the following features:
• Soft-Preemption
• Path Option Attributes
The Auto-Tunnel Attribute-set feature was added for auto-backup
tunnels.
Implementing MPLS Traffic Engineering