Whether or not the first AS number in the AS_PATH attribute in an UPDATE received from a peer should be checked to make sure it is the same as the AS number of the peer. This flag only applies to EBGP peers. It should be set to True unless BGP peers have a specific policy that means they do not prepend their AS number so that it is the first in the path. The setting of this field may be overridden by the equivalent configuration in the peer or peer group if that configuration is not set to inherit from the entity. This field can be changed at any time, but only takes effect for a particular peer when the peer session is restarted.