Cisco Cisco IOS Software Release 12.2(33)SRE

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The BGP Support for Dual AS Configuration for Network AS Migrations feature extends the 
functionality of the Border Gateway Protocol (BGP) local-AS feature by providing additional 
configuration options for customizing autonomous system paths. The configuration of this feature is 
transparent to customer peering sessions, allowing the provider to merge two autonomous systems 
without interrupting customer peering arrangements. Customer peering sessions can be updated later 
during a maintenance window or during other scheduled downtime.

Configuration information is included in the “Configuring BGP Neighbor Session Options” module of 
the Cisco IOS BGP Configuration Guide, Release 12.4T, at the following URL:

The following sections provide information about this feature:

BGP Network Autonomous System Migration 

Configuring Dual-AS Peering for Network Migration 

Configuring Dual-AS Peering for Network Migration: Examples 

For a complete list of features included in the “Configuring BGP Neighbor Session Options” module, 
see the Feature Information table located toward the end of the module.

The following commands are new or modified for this feature: