Network Service Header Metadata Type 2 Variable-Length Context Headers
draft-ietf-sfc-nsh-tlv-04
SFC Y. Wei, Ed.
Internet-Draft ZTE Corporation
Intended status: Standards Track U. Elzur
Expires: July 8, 2021 Intel
S. Majee
C. Pignataro
Cisco
January 4, 2021
Network Service Header Metadata Type 2 Variable-Length Context Headers
draft-ietf-sfc-nsh-tlv-04
Abstract
This draft describes Network Service Header (NSH) Metadata (MD) Type
2 variable-length context headers that can be used within a service
function path.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on July 8, 2021.
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Internet-Draft NSH MD2 Context Headers January 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions used in this document . . . . . . . . . . . . . . 3
2.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Requirements Language . . . . . . . . . . . . . . . . . . 3
3. NSH MD Type 2 format . . . . . . . . . . . . . . . . . . . . 3
4. NSH MD Type 2 Context Headers . . . . . . . . . . . . . . . . 4
4.1. Forwarding Context . . . . . . . . . . . . . . . . . . . 4
4.2. Tenant Identifier . . . . . . . . . . . . . . . . . . . . 5
4.3. Ingress Network Node Information . . . . . . . . . . . . 5
4.4. Ingress Network Source Interface . . . . . . . . . . . . 6
4.5. Flow ID . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.6. Source and/or Destination Groups . . . . . . . . . . . . 7
4.7. Universal Resource Identifier . . . . . . . . . . . . . . 8
4.8. Policy Identifier (POLICY_ID) . . . . . . . . . . . . . . 8
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
7.1. Forwarding Context Types . . . . . . . . . . . . . . . . 10
7.2. Tenant Identifier Types . . . . . . . . . . . . . . . . . 10
7.3. Node ID Types . . . . . . . . . . . . . . . . . . . . . . 10
7.4. Group Types . . . . . . . . . . . . . . . . . . . . . . . 11
7.5. URI Types . . . . . . . . . . . . . . . . . . . . . . . . 11
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
8.1. Normative References . . . . . . . . . . . . . . . . . . 12
8.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 13
1. Introduction
Network Service Header (NSH) [RFC8300] is the Service Function
Chaining (SFC) encapsulation required to support the SFC
architecture. As such, NSH provides following key elements:
1. Service Function Path identification.
2. Indication of location within a Service Function Path.
3. Optional, per-packet metadata (fixed-length or variable).
[RFC8300] further defines two metadata formats (MD Types): 1 and 2.
MD Type 1 defines the fixed-length, 16-octet long metadata, whereas
MD Type 2 defines a variable-length context format for metadata.
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