FC-BGP Protocol Specification

This document defines an extension, Forwarding Commitment BGP (FC- BGP), to the Border Gateway Protocol (BGP). FC-BGP provides security for the path of Autonomous Systems (ASs) through which a BGP UPDATE message passes. Forwarding Commitment (FC) is a cryptographically signed segment to certify an AS's routing intent on its directly connected hops. Based on FC, FC-BGP aims to build a secure inter- domain system that can simultaneously authenticate the AS_PATH attribute in the BGP UPDATE message and alleviate route leaks in the BGP routing system. The extension is backward compatible, which means a router that supports the extension can interoperate with a router that doesn't support the extension.