Preferred Path Routing (PPR) in IS-IS
draft-chunduri-lsr-isis-preferred-path-routing-04
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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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
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
Copyright (c) 2019 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
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described in the Simplified BSD License.
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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