Path Computation Element Communication Protocol (PCEP) Extensions to Enable IFIT
draft-chen-pce-pcep-ifit-01
PCE H. Chen
Internet-Draft China Telecom
Intended status: Standards Track H. Yuan
Expires: March 26, 2021 UnionPay
T. Zhou
W. Li
G. Fioccola
Y. Wang
Huawei
September 22, 2020
Path Computation Element Communication Protocol (PCEP) Extensions to
Enable IFIT
draft-chen-pce-pcep-ifit-01
Abstract
This document defines PCEP extensions to distribute In-situ Flow
Information Telemetry (IFIT) information. So that IFIT behavior can
be enabled automatically when the path is instantiated. In-situ Flow
Information Telemetry (IFIT) refers to network OAM data plane on-path
telemetry techniques, in particular the most popular are In-situ OAM
(IOAM) and Alternate Marking. The IFIT attributes here described can
be generalized for all path types but the application to Segment
Routing (SR) is considered in this document. This document extends
PCEP to carry the IFIT attributes under the stateful PCE model.
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 in BCP 14 [RFC2119]
[RFC8174] when, and only when, they appear in all capitals, as shown
here.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. PCEP Extensions for IFIT Attributes . . . . . . . . . . . . . 4
2.1. IFIT for SR Policies . . . . . . . . . . . . . . . . . . 4
3. IFIT capability advertisement TLV . . . . . . . . . . . . . . 4
4. IFIT Attributes TLV . . . . . . . . . . . . . . . . . . . . . 7
4.1. IOAM Sub-TLVs . . . . . . . . . . . . . . . . . . . . . . 8
4.1.1. IOAM Pre-allocated Trace Option Sub-TLV . . . . . . . 8
4.1.2. IOAM Incremental Trace Option Sub-TLV . . . . . . . . 9
4.1.3. IOAM Directly Export Option Sub-TLV . . . . . . . . . 10
4.1.4. IOAM Edge-to-Edge Option Sub-TLV . . . . . . . . . . 11
4.2. Enhanced Alternate Marking Sub-TLV . . . . . . . . . . . 12
5. PCEP Messages . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1. The PCInitiate Message . . . . . . . . . . . . . . . . . 13
5.2. The PCUpd Message . . . . . . . . . . . . . . . . . . . . 13
5.3. The PCRpt Message . . . . . . . . . . . . . . . . . . . . 13
6. Example of application to SR Policy . . . . . . . . . . . . . 14
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
8. Security Considerations . . . . . . . . . . . . . . . . . . . 16
9. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 17
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 17
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 17
11.1. Normative References . . . . . . . . . . . . . . . . . . 17
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