Cisco Cisco IOS Software Release 12.2(27)SBC

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This feature module details changes to commands that are required to support updates to the 
Multiprotocol Label Switching (MPLS) High Availability (HA) feature. 

In Cisco IOS Releases 12.2(25)S, 12.2(28)SB, 12.2(33)SRA, and 12.2(33)SXH, the MPLS control plane 
software is enhanced to work in MPLS HA environments. The changes made the control plane software 
more modular, which helps MPLS support MPLS HA applications. Some of the control plane software 
changes also made MPLS more scalable and flexible. 

Changes to the MPLS Forwarding Infrastructure (MFI) and the Cisco Express Forwarding component 
introduced new commands and changed other existing commands. MFI replaced the Label Forwarding 
Information Base (LFIB) and is responsible for managing MPLS data structures used for forwarding.

Your Cisco IOS software release may not support all of the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, use the 

.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 
software image support. To access Cisco Feature Navigator, go to 

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account on Cisco.com is not required.