Segment Routing Centralized BGP Egress Peer Engineering
draft-ietf-spring-segment-routing-central-epe-10
Network Working Group C. Filsfils, Ed.
Internet-Draft S. Previdi
Intended status: Informational G. Dawra, Ed.
Expires: June 24, 2018 Cisco Systems, Inc.
E. Aries
Juniper Networks
D. Afanasiev
Yandex
December 21, 2017
Segment Routing Centralized BGP Egress Peer Engineering
draft-ietf-spring-segment-routing-central-epe-10
Abstract
Segment Routing (SR) leverages source routing. A node steers a
packet through a controlled set of instructions, called segments, by
prepending the packet with an SR header. A segment can represent any
instruction topological or service-based. SR allows to enforce a
flow through any topological path while maintaining per-flow state
only at the ingress node of the SR domain.
The Segment Routing architecture can be directly applied to the MPLS
dataplane with no change on the forwarding plane. It requires a
minor extension to the existing link-state routing protocols.
This document illustrates the application of Segment Routing to solve
the BGP Egress Peer Engineering (BGP-EPE) requirement. The SR-based
BGP-EPE solution allows a centralized (Software Defined Network, SDN)
controller to program any egress peer policy at ingress border
routers or at hosts within the domain.
Requirements Language
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 RFC 2119 [RFC2119].
Status of This Memo
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provisions of BCP 78 and BCP 79.
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Drafts is at https://datatracker.ietf.org/drafts/current/.
Filsfils, et al. Expires June 24, 2018 [Page 1]
Internet-Draft Segment Routing Centralized EPE December 2017
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This Internet-Draft will expire on June 24, 2018.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Problem Statement . . . . . . . . . . . . . . . . . . . . 3
2. BGP Peering Segments . . . . . . . . . . . . . . . . . . . . 6
3. Distribution of Topology and TE Information using BGP-LS . . 6
3.1. PeerNode SID to D . . . . . . . . . . . . . . . . . . . . 7
3.2. PeerNode SID to E . . . . . . . . . . . . . . . . . . . . 7
3.3. PeerNode SID to F . . . . . . . . . . . . . . . . . . . . 8
3.4. First PeerAdj to F . . . . . . . . . . . . . . . . . . . 8
3.5. Second PeerAdj to F . . . . . . . . . . . . . . . . . . . 9
3.6. Fast Reroute (FRR) . . . . . . . . . . . . . . . . . . . 9
4. BGP-EPE Controller . . . . . . . . . . . . . . . . . . . . . 10
4.1. Valid Paths From Peers . . . . . . . . . . . . . . . . . 10
4.2. Intra-Domain Topology . . . . . . . . . . . . . . . . . . 11
4.3. External Topology . . . . . . . . . . . . . . . . . . . . 11
4.4. SLA characteristics of each peer . . . . . . . . . . . . 12
4.5. Traffic Matrix . . . . . . . . . . . . . . . . . . . . . 12
4.6. Business Policies . . . . . . . . . . . . . . . . . . . . 12
4.7. BGP-EPE Policy . . . . . . . . . . . . . . . . . . . . . 12
5. Programming an input policy . . . . . . . . . . . . . . . . . 13
5.1. At a Host . . . . . . . . . . . . . . . . . . . . . . . . 13
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