Cisco Cisco IOS Software Release 12.0(22)S

This feature enables you to configure your carrier supporting carrier network to enable Border Gateway 
Protocol (BGP) to transport routes and Multiprotocol Label Switching (MPLS) labels between the 
backbone carrier provider edge (PE) routers and the customer carrier customer edge (CE) routers. 
Previously you had to use Label Distribution Protocol (LDP) to carry the labels and an internal gateway 
protocol (IGP) to carry the routes between PE and CE routers to achieve the same goal. 

This feature is an extension of the Carrier Supporting Carrier feature, introduced in the 12.0(14)ST, 
which was based on LDP. See 

MPLS VPN Carrier Supporting Carrier

 for more information. 

This feature module includes the following sections:

12.0(21)ST

This feature was introduced.

12.0(22)S

This feature was integrated into Cisco IOS Release 12.0(22)S. Support for 
the Cisco 12000 series line cards was added. (See 

 for the specific 

line cards supported.)