PCEP Extensions for Segment Routing leveraging the IPv6 data plane
draft-ietf-pce-segment-routing-ipv6-04
PCE Working Group M. Negi
Internet-Draft C. Li
Intended status: Standards Track Huawei Technologies
Expires: September 10, 2020 S. Sivabalan
Cisco Systems
P. Kaladharan
RtBrick Inc
Z. Yongqing
China Telecom
March 9, 2020
PCEP Extensions for Segment Routing leveraging the IPv6 data plane
draft-ietf-pce-segment-routing-ipv6-04
Abstract
The Source Packet Routing in Networking (SPRING) architecture
describes how Segment Routing (SR) can be used to steer packets
through an IPv6 or MPLS network using the source routing paradigm.
SR enables any head-end node to select any path without relying on a
hop-by-hop signaling technique (e.g., LDP or RSVP-TE).
It depends only on "segments" that are advertised by Link- State
IGPs. A Segment Routed Path can be derived from a variety of
mechanisms, including an IGP Shortest Path Tree (SPT), explicit
configuration, or a Path Computation Element (PCE).
Since SR can be applied to both MPLS and IPv6 forwarding plane, a PCE
should be able to compute SR-Path for both MPLS and IPv6 forwarding
plane. This document describes the extensions required for SR
support for IPv6 data plane in Path Computation Element communication
Protocol (PCEP). The PCEP extension and mechanism to support SR-MPLS
is described in RFC 8664. This document extends it to support SRv6
(SR over IPv6).
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
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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 10, 2020.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Overview of PCEP Operation in SRv6 Networks . . . . . . . . . 5
3.1. Operation Overview . . . . . . . . . . . . . . . . . . . 6
3.2. SRv6-Specific PCEP Message Extensions . . . . . . . . . . 6
4. Object Formats . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. The OPEN Object . . . . . . . . . . . . . . . . . . . . . 7
4.1.1. The SRv6 PCE Capability sub-TLV . . . . . . . . . . . 7
4.2. The RP/SRP Object . . . . . . . . . . . . . . . . . . . . 8
4.3. ERO . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.3.1. SRv6-ERO Subobject . . . . . . . . . . . . . . . . . 8
4.4. RRO . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4.1. SRv6-RRO Subobject . . . . . . . . . . . . . . . . . 11
5. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 11
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