datatracker.ietf.org
Sign in
Version 5.3.0, 2014-04-12
Report a bug

The Accumulated IGP Metric Attribute for BGP
draft-ietf-idr-aigp-17

Document type: Active Internet-Draft (idr WG)
Document stream: IETF
Last updated: 2014-04-10 (latest revision 2014-04-08)
Intended RFC status: Proposed Standard
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Yes
Document shepherd: Susan Hares
Shepherd Write-Up: Last changed 2014-03-04

IESG State: IESG Evaluation
IANA Review State: IANA OK - Actions Needed
IANA Action State: None
(Needs 7 more YES or NO OBJECTION positions to pass.)
Responsible AD: Alia Atlas
Send notices to: idr-chairs@tools.ietf.org, draft-ietf-idr-aigp@tools.ietf.org

Network Working Group                                  Pradosh Mohapatra
Internet Draft                                          Cumulus Networks
Intended Status: Proposed Standard
Expires: October 8, 2014                                    Rex Fernando
                                                           Eric C. Rosen
                                                     Cisco Systems, Inc.

                                                            James Uttaro
                                                                     ATT

                                                           April 8, 2014

              The Accumulated IGP Metric Attribute for BGP

                       draft-ietf-idr-aigp-17.txt

Abstract

   Routing protocols that have been designed to run within a single
   administrative domain ("IGPs") generally do so by assigning a metric
   to each link, and then choosing as the installed path between two
   nodes the path for which the total distance (sum of the metric of
   each link along the path) is minimized.  BGP, designed to provide
   routing over a large number of independent administrative domains
   ("autonomous systems"), does not make its path selection decisions
   through the use of a metric.  It is generally recognized that any
   attempt to do so would incur significant scalability problems, as
   well as inter-administration coordination problems.  However, there
   are deployments in which a single administration runs several
   contiguous BGP networks.  In such cases, it can be desirable, within
   that single administrative domain, for BGP to select paths based on a
   metric, just as an IGP would do.  The purpose of this document is to
   provide a specification for doing so.

Status of this Memo

   This Internet-Draft is submitted to IETF in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.

Mohapatra, et al.                                               [Page 1]



Internet Draft         draft-ietf-idr-aigp-17.txt             April 2014

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at
   http://www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

Copyright and License Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document. Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document. Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Mohapatra, et al.                                               [Page 2]



Internet Draft         draft-ietf-idr-aigp-17.txt             April 2014

Table of Contents

 1          Specification of requirements  .........................   3
 2          Introduction  ..........................................   3
 3          AIGP Attribute  ........................................   5
 3.1        Applicability Restrictions and Cautions  ...............   6
 3.2        Handling a Malformed AIGP Attribute  ...................   6
 3.3        Restrictions on Sending/Receiving  .....................   7
 3.4        Creating and Modifying the AIGP Attribute  .............   7
 3.4.1      Originating the AIGP Attribute  ........................   7
 3.4.2      Modifications by the Originator  .......................   9
 3.4.3      Modifications by a Non-Originator  .....................   9
 4          Decision Process  ......................................  11
 4.1        When a Route has an AIGP Attribute  ....................  11
 4.2        When the Route to the Next Hop has an AIGP attribute  ..  12
 5          Deployment Considerations  .............................  13
 6          IANA Considerations  ...................................  14
 7          Security Considerations  ...............................  14
 8          Acknowledgments  .......................................  14
 9          Authors' Addresses  ....................................  14

[include full document text]