Enclosing container for the list of AS path segments.
In the Adj-RIB-In or Adj-RIB-Out, this list should show
the received or sent AS_PATH, respectively. For
example, if the local router is not 4-byte capable, this
value should consist of 2-octet ASNs or the AS_TRANS
(AS 23456) values received or sent in route updates.
In the Loc-RIB, this list should reflect the effective
AS path for the route, e.g., a 4-octet value if the
local router is 4-octet capable.Reference : RFC 4271 - A Border Gateway Protocol 4 (BGP-4)
RFC 6793 - BGP Support for Four-octet AS Number Space
RFC 5065 - Autonomous System Confederations for BGP