Cisco Cisco IOS Software Release 12.2(14)S

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The BGP Hide Local-Autonomous System feature simplifies the task of changing the autonomous 
system number in a Border Gateway Protocol (BGP) network. Without this feature, this task can be 
difficult because, during the transition, internal BGP (iBGP) peers will reject external routes from peers 
with a local autonomous system number in the autonomous system number path to prevent routing loops. 
This feature allows you to transparently change the autonomous system number for the entire BGP 
network and ensure that routes can be propagated throughout the autonomous system, while the 
autonomous system number transition is incomplete. 

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12.0(18)S

This feature was introduced in Cisco IOS Release 12.0(18)S.

12.2(8)T

This feature was integrated into Cisco IOS Release 12.2(8)T. 

12.2(14)S

This feature was integrated into Cisco IOS Release 12.2(14)S.