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Best Practices for Advertisement of Multiple Paths in IBGP
draft-ietf-idr-add-paths-guidelines-07

Document type: Active Internet-Draft (idr WG)
Document stream: IETF
Last updated: 2014-12-04
Intended RFC status: Unknown
Other versions: plain text, pdf, html

IETF State: WG Document
Document shepherd: No shepherd assigned

IESG State: I-D Exists
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IDR Working Group                                             J. Uttaro
Internet-Draft                                                     AT&T
Intended status: Standards Track
Expires: Jun 3, 2015                                        P. Francois
                                                         IMDEA Networks

                                                               K. Patel
                                                          Cisco Systems

                                                           P. Mohapatra
                                                       Cumulus Networks

                                                                J. Haas
                                                       Juniper Networks

                                                             A. Simpson
                                                            R. Fragassi
                                                         Alcatel-Lucent

                                                            Dec 3, 2014

        Best Practices for Advertisement of Multiple Paths in IBGP
                draft-ietf-idr-add-paths-guidelines-07.txt

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on Jun 3, 2015.

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Internet-Draft  draft-ietf-idr-add-paths-guidelines-07         Dec 2014

Copyright Notice

   Copyright (c) 2012 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.

Abstract

   Add-Paths is a BGP enhancement that allows a BGP router to advertise
   multiple distinct paths for the same prefix/NLRI. This provides a
   number of potential benefits, including reduced routing churn, faster
   convergence and better loadsharing.

   This document provides recommendations to implementers of Add-Paths
   so that network operators have the tools needed to address their
   specific applications and to manage the scalability impact of Add-
   Paths. A router implementing Add-Paths may learn many paths for a
   prefix and must decide which of these to advertise to peers. This
   document analyses different algorithms for making this selection and
   provides recommendations based on the target application.

Table of Contents

   1. Introduction...................................................4
   2. Terminology....................................................4
   3. Add-Paths Applications.........................................5
      3.1. Fast Connectivity Restoration.............................5
      3.2. Load Balancing............................................7
      3.3. Churn Reduction...........................................7
      3.4. Suppression of MED-Related Persistent Route Oscillation...7
   4. Implementation Guidelines......................................8
      4.1. Capability Advertisement..................................8
      4.2. Receiving Multiple Paths..................................9
      4.3. Advertising Multiple Paths................................9
         4.3.1. Path Selection Modes................................11
            4.3.1.1. Advertise N Paths..............................11
            4.3.1.2. Advertise All Paths............................12
            4.3.1.3. Advertise All AS-Wide Best Paths...............13

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