Advertising p2mp policies in BGP
draft-hb-idr-sr-p2mp-policy-01

Document Type Active Internet-Draft (individual)
Authors Hooman Bidgoli  , Daniel Voyer  , Andrew Stone  , Rishabh Parekh  , Serge Krier  , Arvind Venkateswaran 
Last updated 2020-10-29
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Network Working Group                                    H. Bidgoli, Ed.
Internet-Draft                                                     Nokia
Intended status: Standards Track                                V. Voyer
Expires: May 1, 2021                                         Bell Canada
                                                                A. Stone
                                                                   Nokia
                                                               P. Parekh
                                                            Cisco System
                                                                S. Krier
                                                        A. Venkateswaran
                                                      Cisco System, Inc.
                                                        October 28, 2020

                    Advertising p2mp policies in BGP
                     draft-hb-idr-sr-p2mp-policy-01

Abstract

   SR P2MP policies are set of policies that enable architecture for
   P2MP service delivery.

   A P2MP policy consists of candidate paths that connects the Root of
   the Tree to a set of Leaves.  The P2MP policy is composed of
   replication segments.  A replication segment is a forwarding
   instruction for a candidate path which is downloaded to the Root,
   transit nodes and the leaves.

   This document specifies a new BGP SAFI with a new NLRI in order to
   advertise P2MP policy from a controller to a set of nodes.

   This document introduces two new route types within this NLRI, one
   for P2MP policy and its candidate paths that need to be programmed on
   the Root node and another for the replication segment and forwarding
   instructions that needs to be programmed on the Root, and optionally
   on Transit and Leaf nodes.

   It should be noted that this document does not specify how the Root
   and the Leaves are discovered on the controller, it only describes
   how the P2MP Policy and Replication Segments are programmed from the
   controller to the nodes.

Status of This Memo

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

Bidgoli, et al.            Expires May 1, 2021                  [Page 1]
Internet-Draft      Advertising p2mp policies in BGP        October 2020

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Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions used in this document . . . . . . . . . . . . . .   4
   3.  P2MP Policy and Replication Segment Encoding  . . . . . . . .   4
     3.1.  P2MP Policy SAFI and NLRI . . . . . . . . . . . . . . . .   4
       3.1.1.  P2MP Policy Route . . . . . . . . . . . . . . . . . .   5
       3.1.2.  Non-shared Tree Replication segment Route . . . . . .   6
       3.1.3.  Shared Tree Replication Segment Route . . . . . . . .   6
     3.2.  Tunnel Encapsulation Attribute  . . . . . . . . . . . . .   6
       3.2.1.  SR P2MP policy encoding . . . . . . . . . . . . . . .   7
       3.2.2.  replication segment encoding  . . . . . . . . . . . .   7
     3.3.  P2MP Policy Sub-TLVs  . . . . . . . . . . . . . . . . . .   8
       3.3.1.  preference Sub-TLV  . . . . . . . . . . . . . . . . .   8
       3.3.2.  leaf-list Sub-TLV . . . . . . . . . . . . . . . . . .   8
       3.3.3.  path-instance Sub-TLV . . . . . . . . . . . . . . . .   9
         3.3.3.1.  active instance-id Sub-TLV  . . . . . . . . . . .  10
         3.3.3.2.  instance-id Sub-TLV . . . . . . . . . . . . . . .  10
     3.4.  replication segment Sub-TLVs  . . . . . . . . . . . . . .  11
       3.4.1.  Replication SID (Binding SID) . . . . . . . . . . . .  11
       3.4.2.  down stream nodes Sub-TLV . . . . . . . . . . . . . .  11
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