Inter-domain Network Slicing via BGP-LU
draft-zhou-idr-inter-domain-lcu-02
IDR Working Group R. Chen
Internet-Draft Ch. Dai
Intended status: Standards Track Sh. Peng
Expires: July 14, 2021 ZTE Corporation
January 10, 2021
Inter-domain Network Slicing via BGP-LU
draft-zhou-idr-inter-domain-lcu-02
Abstract
This document aims to solve inter-domain network slicing problems
using existing technologies. It attempts to establish multiple BGP-
LU LSPs of different colors for a prefix to stitch multiple network
segments.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Requirements notation . . . . . . . . . . . . . . . . . . . . 2
3. Color . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
4. Advertising multiple paths . . . . . . . . . . . . . . . . . 3
5. Assigning Label(s) . . . . . . . . . . . . . . . . . . . . . 3
6. Inter-domain Network Slicing via BGP-LU . . . . . . . . . . . 4
7. Deploy Considerations . . . . . . . . . . . . . . . . . . . . 6
8. Security Considerations . . . . . . . . . . . . . . . . . . . 6
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
10.1. Normative References . . . . . . . . . . . . . . . . . . 6
10.2. Information References . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
As described in [I-D.peng-teas-network-slicing], in the traditional
end to end inter-domain network slicing, BGP-LU to build inter-domain
MPLS LSP, and overlay service will be directly over BGP-LU LSP.
[RFC8277] specifies a set of procedures for using BGP to advertise
that a specified router has bound a specified MPLS label to a
specified address prefix. It's an effective way for inter-domain
labels, but it does not have the ability to select the underlying
network resources.
This document describes the colored BGP-LU LSP, which defines the
multiple paths for the same destination prefix can be advertised in
BGP UPDATE message, and each UPDATE message can contain the color
Extended Community [I-D.ietf-idr-tunnel-encaps] with different color
value, which helps to select the underlying resources.
2. Requirements notation
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 [RFC2119].
3. Color
[I-D.ietf-idr-tunnel-encaps] introduces the concept of color, which
is used as one of the KEY of SR policy
[I-D.ietf-spring-segment-routing-policy]. The color of SR policy
defines a TE purpose, which includes a set of constraints such as
bandwidth, delay, TE metric, etc.
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Color is used a policy keyword to help routing decisions and can be
carried through Community attribute [I-D.ietf-idr-tunnel-encaps] in
BGP. Each UPDATE SHOULD contain a Color Extended Community with a
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