The SRv6 END.DTM Segment Type
draft-bonica-spring-srv6-end-dtm-00
SPRING Working Group S. Hegde
Internet-Draft K. Vairavakkalai
Intended status: Standards Track R. Bonica
Expires: July 12, 2021 Juniper Networks
January 8, 2021
The SRv6 END.DTM Segment Type
draft-bonica-spring-srv6-end-dtm-00
Abstract
This document describes a new SRv6 segment type, called END.DTM. The
END.DTM segment type supports inter-working between SRv6 and SR-MPLS.
Like any segment type, END.DTM contains a function and arguments.
The function causes the processing SRv6 node to remove an SRv6 header
and impose an SR-MPLS label stack. The arguments determine MPLS-
label stack contents.
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Table of Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language . . . . . . . . . . . . . . . . . . . . 2
3. Use-case . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Processing . . . . . . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
6. Security Considerations . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
8.1. Normative References . . . . . . . . . . . . . . . . . . 5
8.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
1. Overview
Segment Routing (SR) [RFC8402] allows source nodes to steer packets
through SR paths. It can be implemented over IPv6 [RFC8200] or MPLS
[RFC3031]. When SR is implemented over IPv6, it is called SRv6
[I-D.ietf-spring-srv6-network-programming]. When SR is implemented
over MPLS, it is called SR-MPLS [RFC8660].
This document describes a new SRv6 segment type, called END.DTM. The
END.DTM segment type supports inter-working between SRv6 and SR-MPLS.
Like any segment type, END.DTM contains a function and arguments.
The function causes the processing SRv6 node to:
o Remove an SRv6 header (i.e., an IPv6 header and its extensions).
o Impose an SR-MPLS label stack.
The arguments determine MPLS-label stack contents and Transport Class
of the MPLS Tunnel.
2. 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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3. Use-case
------ ------ ------ ------ ------
|Node 1| --- |Node 2| --- |Node 3| --- |Node 4| --- |Node 5|
------ ------ ------ ------ ------
Seg. A Seg. B Seg. C Seg. D
<-----------SRv6 Part ----------><-------SR-MPLS Part------>
Figure 1: END.DTM Use-case
Figure 1 depicts an inter-working SR path. The SR path originates on
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