3.7.g Implement and troubleshoot AS path manipulations

  • 3.7.g [i] Local AS, allow AS in, remove private AS

The local-AS feature allows a router to appear to be a member of a second autonomous system (AS), in addition to its real AS. This feature can only be used for true eBGP peers. You cannot use this feature for two peers that are members of different confederation sub-ASs. neighbor allowas-i n command is issued in order to allow BGP at the other side to inject updates.

To remove the private AS number, use the neighbor x.x.x.x remove-private-as router configuration command.

The debug ip bgp updates command displays the received prefixes with its attributes from the neighbor.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 4084-4091).  . Kindle Edition.