Configure the AS Number

An AS is a set of routers that are under a single technical administration and that generally use a single interior gateway protocol (IGP) and metrics to propagate routing information within the set of routers. An AS appears to other ASs to have a single, coherent interior routing plan and presents a consistent picture of what destinations are reachable through it.

ASs are identified by a number from 1 through 65,535 that is assigned by the Network Information Center (NIC) (in the United States, http://www.isi.edu).

If you are using BGP on the router, you must configure an AS number.

To configure the router's AS number, include the autonomous-system statement at the [edit routing-options] hierarchy level (for routing instances, include the statement at the [edit routing-instances routing-instance-name routing-options] hierarchy level):

[edit]

routing-options {

    autonomous-system autonomous-system <loops number>; 

}

To specify how many times this AS number can appear in an AS path, include the loops option.