Usage of Non Shortest Path Forwarding (NSPF) IDs in IS-IS
draft-ct-isis-nspfid-for-sr-paths-01

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LSR Working Group                                       U. Chunduri, Ed.
Internet-Draft                                                Huawei USA
Intended status: Standards Track                             J. Tantsura
Expires: September 24, 2018                               Nuage Networks
                                                                   Y. Qu
                                                              Huawei USA
                                                          March 23, 2018

       Usage of Non Shortest Path Forwarding (NSPF) IDs in IS-IS
                  draft-ct-isis-nspfid-for-sr-paths-01

Abstract

   This document specifies the advertisement of Non Shortest Path
   Forwarding IDentifier (NSPF ID) TLV and the computation procedures
   for the same in IS-IS protocol.  NSPF ID allows to simplify the data
   plane path description of data traffic in SR deployments.  This helps
   mitigate the MTU issues that are caused by additional SR overhead of
   the packet and allows traffic statistics.

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].

Status of This Memo

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

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   This Internet-Draft will expire on September 24, 2018.

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Internet-DraUsage of Non Shortest Path Forwarding (NSPF) IDs  March 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Mitigation with MSD and RLD . . . . . . . . . . . . . . .   3
     1.2.  Issues with Increased SID Depth . . . . . . . . . . . . .   3
     1.3.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Non Shortest Path Forwarding IDentifier TLV . . . . . . . . .   6
     2.1.  Flags . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     2.2.  NSPF-ID Fields  . . . . . . . . . . . . . . . . . . . . .   8
     2.3.  NSP sub-TLVs  . . . . . . . . . . . . . . . . . . . . . .   9
     2.4.  Non-NSP sub-TLVs  . . . . . . . . . . . . . . . . . . . .   9
   3.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .  10
   4.  NSPF ID Data Plane aspects  . . . . . . . . . . . . . . . . .  12
     4.1.  MPLS Data Plane . . . . . . . . . . . . . . . . . . . . .  12
     4.2.  SRv6 Data Plane . . . . . . . . . . . . . . . . . . . . .  12
   5.  NSP Traffic Accounting  . . . . . . . . . . . . . . . . . . .  12
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   In a network implementing source routing, packets may be transported
   through the use of segment identifiers (SIDs), where a SID uniquely
   identifies a segment as defined in [I-D.ietf-spring-segment-routing].
   In SR-MPLS, a segment is encoded as a label and an ordered list of
   segments is encoded as a stack of labels.  In SRv6, a segment is
   encoded as an IPv6 address, with a new type of IPv6 routing header

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