SRv6 for Inter-Layer Network Programming
draft-dong-spring-srv6-inter-layer-programming-01
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Jie Dong
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Zongpeng Du
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2020-10-31
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SPRING Working Group J. Dong
Internet-Draft Huawei Technologies
Intended status: Standards Track Z. Du
Expires: May 4, 2021 China Mobile
October 31, 2020
SRv6 for Inter-Layer Network Programming
draft-dong-spring-srv6-inter-layer-programming-01
Abstract
This document defines a new SRv6 network function which can be used
for SRv6 inter-layer network programming. It is a variant of the
End.X function. Instead of pointing to an L3 adjacency, this
function points to an underlay interface. Such a interface can stand
for a underlay link or path/connection between two routers, which may
be invisible in the L3 topology.
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 May 4, 2021.
Copyright Notice
Copyright (c) 2020 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
Dong & Du Expires May 4, 2021 [Page 1]
Internet-Draft SRv6 Inter-Layer Network Programming October 2020
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements Language and Terminology . . . . . . . . . . . . 3
3. END.XU Function . . . . . . . . . . . . . . . . . . . . . . . 3
4. Use Case for SRv6 Underlay Interface Function . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 7
8.1. Normative References . . . . . . . . . . . . . . . . . . 7
8.2. Informative References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
In many scenarios, operator owns a multi-layered network. In that
case, cross-layer design and optimization mechanisms are more
efficient in resource utilization and SLA assurance, but normally are
also considered more complicated. As an IP/MPLS based technology,
Segment Routing (SR) normally does not need to care about the network
layers beneath the IP layer. One exception is as described in
[RFC8668], IS-IS is extended to advertise the link attributes and
Segment Identifiers (SIDs) of Layer 2 (L2) bundle members, so that
operator can control traffic flows to traverse a particular
individual L2 link which comprises the L2 bundle interface
In [I-D.ietf-spring-srv6-network-programming], it is described that
for an outgoing interface bundle made of 10 member links, up to 11
End.X local SIDs for that bundle need to be allocated. One END.X for
the bundle itself and then up to one END.X for each member link.
However, there are some differences between the normal END.X function
for the bundle and the END.X function for the member link, as they
are not at the same network layer. Moreover, besides the L2 bundle
use case, there are other types of underlay interfaces or
connections, which can be integrated and programmed using SRv6. This
document aims to define a unified SRv6 function to support those
inter-layer network programming in SRv6.
As another example, the underlay of the IP network can be an optical
network. In many today's IP and optical transport networks, IP
network and optical network are maintained separately, and in most
cases, the optical network works as an underlay which is invisible to
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