PIM Router Graceful Insertion and Removal
draft-raunak-pim-gir-support-00

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Last updated 2018-06-28
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Network Working Group                                R. Chokkanathapuram
Internet-Draft                                                R. Banthia
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: December 30, 2018                                 June 28, 2018

               PIM Router Graceful Insertion and Removal
                    draft-raunak-pim-gir-support-00

Abstract

   Graceful Insertion and Removal (GIR) of routers is often adopted by
   many network administrators as an alternative to ISSU.  This document
   discusses various scenarios, requirements and possible solutions to
   make PIM gracefully shut down and isolate the multicast router with
   minimal network disruption when a router goes through maintenance
   procedures.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   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 December 30, 2018.

Copyright Notice

   Copyright (c) 2018 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
   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

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Applicability . . . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Graceful RPF change . . . . . . . . . . . . . . . . . . . . .   2
   5.  GIR removal procedure for a PIM router  . . . . . . . . . . .   3
   6.  GIR insertion procedure for a PIM router  . . . . . . . . . .   4
   7.  Compatibility . . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  PIM GIR TLV . . . . . . . . . . . . . . . . . . . . . . . . .   5
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   10. Security Considerations . . . . . . . . . . . . . . . . . . .   5
   11. Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   When a network administrator wishes to perform maintenance activity
   on a router, a system maintenance mode command need to be configured.
   This isolates the router from the network by gracefully shutting down
   various protocols running on the router.  Multicast protocols will
   also require graceful migration in order to achieve minimal traffic
   disruption when a maintenance activity is performed on a router.
   This document proposes a possible solution to perform GIR with PIM
   routers gracefully.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119]  .

   With respect to PIM, this document follows the terminology that has
   been defined in [RFC7761]

3.  Applicability

   The proposed change described in this specification applies to PIM
   routers only.

4.  Graceful RPF change

   Multicast routing protocol uses Unicast reachability information to
   find unique Reverse Path Forwarding Neighbor (RPF).  Any change in
   unicast routing triggers multicast RPF changes.  Multicast flows need

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   to change the RPF in a graceful manner to have minimal or no
   disruption in traffic flow.  To achieve graceful RPF change, PIM
   should not change RPF immediately following unicast routing change.
   PIM should join the new path and wait for the traffic to arrive on
   the new path before pruning the old path.  Until the packets arrive
   on the new path, the packets are accepted and forwarded on the old
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