The Border Gateway Protocol, version 4, (BGP4) provides the means to
advertise reachability for IP prefixes. This reachability
information is propagated in a peer-to-peer topology. Sometimes
routes are announced to peers for which the local peering policy does
not permit. And sometimes routes are propagated indiscriminantly,
once they have been accepted.
This document considers the situations that can lead to routes being
leaked, and tries to find acceptable definitions for describing these
The purpose of these definitions is to facilitate discussion on what
a route leak is, and what the scope of the problem space for route
leaks is. This, in turn, is intended to inform a requirements
document for detection of (and prevention of) route leaks. And
finally, the definitions and requirements are intended to allow
proposed solutions which meet these criteria, and to facilitate
evaluation of proposed solutions.
The fundamental objective is to "solve the route leaks problem".