Preferred Path Routing (PPR) in OSPF
draft-chunduri-lsr-ospf-preferred-path-routing-04

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LSR Working Group                                            U. Chunduri
Internet-Draft                                                     Y. Qu
Intended status: Standards Track                               Futurewei
Expires: September 9, 2020                                      R. White
                                                        Juniper Networks
                                                             J. Tantsura
                                                             Apstra Inc.
                                                            L. Contreras
                                                              Telefonica
                                                           March 8, 2020

                  Preferred Path Routing (PPR) in OSPF
           draft-chunduri-lsr-ospf-preferred-path-routing-04

Abstract

   This document specifies a Preferred Path Routing (PPR), a routing
   protocol mechanism to simplify the path description of data plane
   traffic in Segment Routing (SR) deployments with OSPFv2 and OSPFv3
   protocols.  PPR aims to mitigate the MTU and data plane processing
   issues that may result from SR packet overheads; and also supports
   further extensions along the paths.  Preferred path routing is
   achieved through the addition of path descriptions to the OSPF
   advertised prefixes, and mapping those to a PPR data-plane
   identifier.

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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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

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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 September 9, 2020.

Copyright Notice

   Copyright (c) 2020 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  OSPFv2 PPR TLV  . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  PPR-Flags . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.2.  PPR-Prefix Sub-TLV  . . . . . . . . . . . . . . . . . . .   6
     2.3.  PPR-ID Sub-TLV  . . . . . . . . . . . . . . . . . . . . .   7
     2.4.  PPR-PDE Sub-TLV . . . . . . . . . . . . . . . . . . . . .   9
     2.5.  PPR-Attributes Sub-TLV  . . . . . . . . . . . . . . . . .  11
   3.  OSPFv3 PPR TLV  . . . . . . . . . . . . . . . . . . . . . . .  12
     3.1.  OSPFv3 PPR-Prefix Sub-TLV . . . . . . . . . . . . . . . .  13
     3.2.  OSPFv3 PPR-ID Sub-TLVs  . . . . . . . . . . . . . . . . .  14
     3.3.  OSPFv3 PPR-PDE Sub-TLV  . . . . . . . . . . . . . . . . .  16
     3.4.  OSPFv3 PPR-Attributes Sub-TLV . . . . . . . . . . . . . .  19
   4.  Other Considerations  . . . . . . . . . . . . . . . . . . . .  19
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  19
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  20
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  20
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  22

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