BGP Extensions for Unified SID in TE Policy
draft-liu-idr-segment-routing-te-policy-complement-04
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Liu Yao
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Shaofu Peng
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2020-11-23
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IDR Working Group Yao. Liu
Internet-Draft Shaofu. Peng
Intended status: Standards Track ZTE Corporation
Expires: May 27, 2021 November 23, 2020
BGP Extensions for Unified SID in TE Policy
draft-liu-idr-segment-routing-te-policy-complement-04
Abstract
This document defines extensions to BGP in order to advertise Unified
SIDs in SR-TE policies.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
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and may be updated, replaced, or obsoleted by other documents at any
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 27, 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
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described in the Simplified BSD License.
Liu & Peng Expires May 27, 2021 [Page 1]
Internet-Draft BGP for Unified SID November 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. SR policy with Unified SID . . . . . . . . . . . . . . . . . 2
2.1. Advertisement of SID Attribute . . . . . . . . . . . . . 4
2.1.1. Option 1: Advertising SID Attribute within existing
sub-TLVs . . . . . . . . . . . . . . . . . . . . . . 4
2.1.2. Option 2: Introducing a new U-segment list sub-TLV . 7
2.2. Controller Processing . . . . . . . . . . . . . . . . . . 7
2.3. Headend Processing . . . . . . . . . . . . . . . . . . . 8
3. Security Considerations . . . . . . . . . . . . . . . . . . . 9
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 9
5. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1. Normative References . . . . . . . . . . . . . . . . . . 9
5.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Segment Routing [RFC8402] leverages the source routing paradigm. An
ingress node steers a packet through an ordered list of
instructions,called segments.
[I-D.ietf-spring-segment-routing-policy] details the concepts of SR
Policy and steering into an SR Policy.
[I-D.ietf-idr-segment-routing-te-policy] specifies the way to use BGP
to distribute one or more of the candidate paths of an SR Policy to
the headend of that policy.
With increasing requirements for a shortened identifier in a segment
routing network with the IPv6 data plane,
[I-D.mirsky-6man-unified-id-sr] proposed an extension of SRH that
enables the use of a shorter segment identifier, such as 32-bits
Label format SID or 32-bits IP address format SID.
This document defines extensions to BGP in order to advertise Unified
SIDs in SR-TE policies.
Firstly, we focus on how to carry 32-bits IP address format U-SID,
other type of U-SID (such as 16-bits) will be considered in future
version.
2. SR policy with Unified SID
As discussed in [I-D.ietf-spring-srv6-network-programming], the node
with the SRv6 capability will maintain its local SID table. A Local
Liu & Peng Expires May 27, 2021 [Page 2]
Internet-Draft BGP for Unified SID November 2020
SID is generally composed of two parts, that is, LOC:FUNCT, or may
carry arguments at the same time, that is, LOC:FUNCT:ARGS.
FUNCT indicates the local function of the packet on the node that
generates the LOC.ARGS may contain information related to traffic and
services, or any other information required for executing the
function.LOC indicates locator. In most cases, other nodes in the
network can forward packets to the node that generates this LOC
according to the corresponding routing table entries.
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