The BGP Version 4 routing protocol (RFC4271) is now used in many
ways, crossing boundaries of administrative and technical
responsibility.
The protocol lacks an operational messaging plane which could be
utilised to diagnose, troubleshoot and inform upon various conditions
across these boundaries, securely, during protocol operation, without
disruption.
This document proposes a new BGP message type, the OPERATIONAL
message, which can be used to effect such a messaging plane for use
both between and within Autonomous Systems.
datatracker.ietf.org