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North-Bound Distribution of Link-State and Traffic Engineering (TE) Information Using BGP (RFC7752) Disclosure Number: IPCOM000245562D
Original Publication Date: 2016-Mar-01
Included in the Prior Art Database: 2016-Mar-17

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

H. Gredler: AUTHOR [+6]


The contents of a Link-State Database (LSDB) or of an IGP's Traffic Engineering Database (TED) describe only the links and nodes within an IGP area. Some applications, such as end-to-end Traffic Engineering (TE), would benefit from visibility outside one area or Autonomous System (AS) in order to make better decisions.

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Internet Engineering Task Force (IETF)                   H. Gredler, Ed. Request for Comments: 7752                        Individual Contributor Category: Standards Track                                      J. Medved ISSN: 2070-1721                                               S. Previdi                                                      Cisco Systems, Inc.                                                                A. Farrel                                                   Juniper Networks, Inc.                                                                   S. Ray                                                               March 2016

   North-Bound Distribution of Link-State and Traffic Engineering (TE)                          Information Using BGP


   In a number of environments, a component external to a network is    called upon to perform computations based on the network topology and    current state of the connections within the network, including    Traffic Engineering (TE) information.  This is information typically    distributed by IGP routing protocols within the network.

   This document describes a mechanism by which link-state and TE    information can be collected from networks and shared with external    components using the BGP routing protocol.  This is achieved using a    new BGP Network Layer Reachability Information (NLRI) encoding    format.  The mechanism is applicable to physical and virtual IGP    links.  The mechanism described is subject to policy control.

   Applications of this technique include Application-Layer Traffic    Optimization (ALTO) servers and Path Computation Elements (PCEs).

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Further information on    Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at

 Gredler, et al.              Standards Track                    [Page 1]
 RFC 7752         Link-State Info Distribution Using BGP       March 2016

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