Mitigating Negative Impact of Maintenance through BGP Session Culling
draft-ietf-grow-bgp-session-culling-04

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Global Routing Operations                                    W. Hargrave
Internet-Draft                                                     LONAP
Intended status: Best Current Practice                       M. Griswold
Expires: March 14, 2018                                              20C
                                                             J. Snijders
                                                                     NTT
                                                             N. Hilliard
                                                                    INEX
                                                      September 10, 2017

 Mitigating Negative Impact of Maintenance through BGP Session Culling
                 draft-ietf-grow-bgp-session-culling-04

Abstract

   This document outlines an approach to mitigate negative impact on
   networks resulting from maintenance activities.  It includes guidance
   for both IP networks and Internet Exchange Points (IXPs).  The
   approach is to ensure BGP-4 sessions affected by the maintenance are
   forcefully torn down before the actual maintenance activities
   commence.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on March 14, 2018.

Copyright Notice

   Copyright (c) 2017 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
   (https://trustee.ietf.org/license-info) in effect on the date of

Hargrave, et al.         Expires March 14, 2018                 [Page 1]
Internet-Draft             BGP Session Culling            September 2017

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  BGP Session Culling . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Voluntary BGP Session Teardown Recommendations  . . . . .   3
       3.1.1.  Maintenance Considerations  . . . . . . . . . . . . .   4
     3.2.  Involuntary BGP Session Teardown Recommendations  . . . .   4
       3.2.1.  Packet Filter Considerations  . . . . . . . . . . . .   4
       3.2.2.  Hardware Considerations . . . . . . . . . . . . . . .   5
     3.3.  Procedural Considerations . . . . . . . . . . . . . . . .   6
   4.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Example packet filters . . . . . . . . . . . . . . .   7
     A.1.  Cisco IOS, IOS XR & Arista EOS Firewall Example
           Configuration . . . . . . . . . . . . . . . . . . . . . .   7
     A.2.  Nokia SR OS Filter Example Configuration  . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   BGP Session Culling is the practice of ensuring BGP sessions are
   forcefully torn down before maintenance activities on a lower layer
   network commence, which otherwise would affect the flow of data
   between the BGP speakers.

   BGP Session Culling ensures that lower layer network maintenance
   activities cause the minimum possible amount of disruption, by
   causing BGP speakers to preemptively converge onto alternative paths
   while the lower layer network's forwarding plane remains fully
   operational.

   The grace period required for a successful application of BGP Session
   Culling is the sum of the time needed to detect the loss of the BGP
   session, plus the time required for the BGP speaker to converge onto
   alternative paths.  The first value is often governed by the BGP Hold