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In Traffic-Engineered (TE) systems, it is sometimes desirable toestablish an end-to-end TE path with a set of constraints (such asbandwidth) across one or more networks from a source to a destination.TE information is the data relating to nodes and TE links that is usedin the process of selecting a TE path. TE information is usually onlyavailable within a network. We call such a zone of visibility of TEinformation a domain. An example of a domain may be an IGP area or anAutonomous System. In order to determine the potential to establish aTE path through a series of connected networks, it is necessary tohave available a certain amount of TE information about each network.This need not be the full set of TE information available within eachnetwork but does need to express the potential of providing TEconnectivity. This subset of TE information is called TE reachabilityinformation. This document sets out the problem statement for theexchange of TE information between interconnected TE networks insupport of end-to-end TE path establishment and describes the bestcurrent practice architecture to meet this problem statement. Forreasons that are explained in this document, this work is limited tosimple TE constraints and information that determine TE reachability.

Problem Statement and Architecture for Information Exchange between Interconnected Traffic-Engineered Networks