Preferred Path Routing (PPR) in IS-IS
draft-chunduri-lsr-isis-preferred-path-routing-04

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Last updated 2019-07-08
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LSR Working Group                                            U. Chunduri
Internet-Draft                                                     R. Li
Intended status: Standards Track                               Futurewei
Expires: January 9, 2020                                        R. White
                                                        Juniper Networks
                                                             J. Tantsura
                                                             Apstra Inc.
                                                            L. Contreras
                                                              Telefonica
                                                                   Y. Qu
                                                               Futurewei
                                                            July 8, 2019

                 Preferred Path Routing (PPR) in IS-IS
           draft-chunduri-lsr-isis-preferred-path-routing-04

Abstract

   This document specifies Preferred Path Routing (PPR), a routing
   protocol extension to simplify the path description on the packet for
   Segment Routing (SR) deployments and beyond.  PPR aims to mitigate
   the MTU and data plane processing issues that may result from SR
   packet overhead; and also supports further extensions along the
   paths.

Requirements Language

   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 [RFC2119],
   RFC8174 [RFC8174] when, and only when they appear in all capitals, as
   shown here.

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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Chunduri, et al.         Expires January 9, 2020                [Page 1]
Internet-Draft    Preferred Path Routing (PPR) in IS-IS        July 2019

   This Internet-Draft will expire on January 9, 2020.

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Preferred Path Routing (PPR)  . . . . . . . . . . . . . . . .   4
     2.1.  PPR-ID and Data Plane Extensibility . . . . . . . . . . .   4
     2.2.  PPR Path Description  . . . . . . . . . . . . . . . . . .   4
     2.3.  ECMP Considerations . . . . . . . . . . . . . . . . . . .   5
     2.4.  Scalability and PPR Graphs  . . . . . . . . . . . . . . .   5
   3.  PPR Related TLVs  . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  PPR-Prefix Sub-TLV  . . . . . . . . . . . . . . . . . . .   8
     3.2.  PPR-ID Sub-TLV  . . . . . . . . . . . . . . . . . . . . .   8
     3.3.  PPR-PDE Sub-TLV . . . . . . . . . . . . . . . . . . . . .  10
     3.4.  PPR-Attributes Sub-TLV  . . . . . . . . . . . . . . . . .  13
   4.  PPR Processing Procedure Example  . . . . . . . . . . . . . .  13
     4.1.  PPR TLV Processing  . . . . . . . . . . . . . . . . . . .  15
     4.2.  Path Fragments  . . . . . . . . . . . . . . . . . . . . .  16
   5.  PPR Data Plane aspects  . . . . . . . . . . . . . . . . . . .  16
     5.1.  SR-MPLS with PPR  . . . . . . . . . . . . . . . . . . . .  16
     5.2.  PPR Native IP Data Planes . . . . . . . . . . . . . . . .  17
     5.3.  SRv6 with PPR . . . . . . . . . . . . . . . . . . . . . .  17
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  18
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
     7.1.  PPR Sub-TLVs  . . . . . . . . . . . . . . . . . . . . . .  18
     7.2.  IGP Parameters  . . . . . . . . . . . . . . . . . . . . .  19
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