RFC 8986 - Segment Routing over IPv6 (SRv6) Network Programming

Standards Track
Published: February 2021

Authors

• C. Filsfils (Ed.), Cisco Systems, Inc.
• P. Camarillo (Ed.), Cisco Systems, Inc.
• J. Leddy, Akamai Technologies
• D. Voyer, Bell Canada
• S. Matsushima, SoftBank
• Z. Li, Huawei Technologies

Abstract

The Segment Routing over IPv6 (SRv6) Network Programming framework enables a network operator or an application to specify a packet processing program by encoding a sequence of instructions in the IPv6 packet header.

Each instruction is implemented on one or several nodes in the network and identified by an SRv6 Segment Identifier in the packet.

This document defines the SRv6 Network Programming concept and specifies the base set of SRv6 behaviors that enables the creation of interoperable overlays with underlay optimization.

Status of This Memo

This is an Internet Standards Track document.

This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc8986.

Copyright Notice

Copyright (c) 2021 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 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.

Contents

• 1. Introduction
• 2. Terminology
  • 2.1. Requirements Language
• 3. SRv6 SID
  • 3.1. SID Format
  • 3.2. SID Allocation within an SR Domain
  • 3.3. SID Reachability
• 4. SR Endpoint Behaviors
  • 4.1. End: Endpoint
  • 4.2. End.X: L3 Cross-Connect
  • 4.3. End.T: Specific IPv6 Table Lookup
  • 4.4. End.DX6: Decapsulation and IPv6 Cross-Connect
  • 4.5. End.DX4: Decapsulation and IPv4 Cross-Connect
  • 4.6. End.DT6: Decapsulation and Specific IPv6 Table Lookup
  • 4.7. End.DT4: Decapsulation and Specific IPv4 Table Lookup
  • 4.8. End.DT46: Decapsulation and Specific IP Table Lookup
  • 4.9. End.DX2: Decapsulation and L2 Cross-Connect
  • 4.10. End.DX2V: Decapsulation and VLAN L2 Table Lookup
  • 4.11. End.DT2U: Decapsulation and Unicast MAC L2 Table Lookup
  • 4.12. End.DT2M: Decapsulation and L2 Table Flooding
  • 4.13. End.B6.Encaps: Endpoint Bound to an SRv6 Policy with Encapsulation
  • 4.14. End.B6.Encaps.Red: End.B6.Encaps with Reduced SRH
  • 4.15. End.BM: Endpoint Bound to an SR-MPLS Policy
  • 4.16. Flavors
• 5. SR Policy Headend Behaviors
  • 5.1. H.Encaps: SR Headend with Encapsulation in an SR Policy
  • 5.2. H.Encaps.Red: H.Encaps with Reduced Encapsulation
  • 5.3. H.Encaps.L2: H.Encaps Applied to Received L2 Frames
  • 5.4. H.Encaps.L2.Red: H.Encaps.Red Applied to Received L2 Frames
• 6. Counters
• 7. Flow-Based Hash Computation
• 8. Control Plane
  • 8.1. IGP
  • 8.2. BGP-LS
  • 8.3. BGP IP/VPN/EVPN
  • 8.4. Summary
• 9. Security Considerations
• 10. IANA Considerations
  • 10.1. Ethernet Next Header Type
  • 10.2. SRv6 Endpoint Behaviors Registry
• 11. References
  • 11.1. Normative References
  • 11.2. Informative References
• Acknowledgements
• Contributors
• Authors' Addresses