Problem Statement and Architecture for Information Exchange between Interconnected Traffic-Engineered Networks (RFC7926)
Original Publication Date: 2016-Jul-01
Included in the Prior Art Database: 2016-Jul-27
Internet Society Requests For Comment (RFCs)
A. Farrel: AUTHOR [+7]
Traffic-Engineered (TE) systems such as MPLS-TE [RFC2702] and GMPLS [RFC3945] offer a way to establish paths through a network in a controlled way that reserves network resources on specified links. TE paths are computed by examining the Traffic Engineering Database (TED) and selecting a sequence of links and nodes that are capable of meeting the requirements of the path to be established. The TED is constructed from information distributed by the Interior Gateway Protocol (IGP) running in the network -- for example, OSPF-TE [RFC3630] or ISIS-TE [RFC5305].
Internet Engineering Task Force (IETF) A. Farrel, Ed. Request for Comments: 7926 J. Drake BCP: 206 Juniper Networks Category: Best Current Practice N. Bitar ISSN: 2070-1721 Nokia G. Swallow Cisco Systems, Inc. D. Ceccarelli Ericsson X. Zhang Huawei July 2016
Problem Statement and Architecture for Information Exchange between Interconnected Traffic-Engineered Networks
In Traffic-Engineered (TE) systems, it is sometimes desirable to establish an end-to-end TE path with a set of constraints (such as bandwidth) across one or more networks from a source to a destination. TE information is the data relating to nodes and TE links that is used in the process of selecting a TE path. TE information is usually only available within a network. We call such a zone of visibility of TE information a domain. An example of a domain may be an IGP area or an Autonomous System.
In order to determine the potential to establish a TE path through a series of connected networks, it is necessary to have available a certain amount of TE information about each network. This need not be the full set of TE information available within each network but does need to express the potential of providing TE connectivity. This subset of TE information is called TE reachability information.
This document sets out the problem statement for the exchange of TE information between interconnected TE networks in support of end-to- end TE path establishment and describes the best current practice architecture to meet this problem statement. For reasons that are explained in this document, this work is limited to...