Uberlay Interconnection of Multiple LISP overlays
draft-moreno-lisp-uberlay-03
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2020-08-03
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Network Working Group V. Moreno
Internet-Draft Cisco Systems
Intended status: Experimental D. Farinacci
Expires: February 4, 2021 lispers.net
A. Rodriguez-Natal
M. Portoles-Comeras
F. Maino
S. Hooda
Cisco Systems
August 03, 2020
Uberlay Interconnection of Multiple LISP overlays
draft-moreno-lisp-uberlay-03
Abstract
This document describes the use of the Locator/ID Separation Protocol
(LISP) to interconnect multiple disparate and independent network
overlays by using a transit overlay. The transit overlay is referred
to as the "uberlay" and provides connectivity and control plane
abstraction between different overlays. Each network overlay may use
different control and data plane approaches and may be managed by a
different organization. Structuring the network into multiple
network overlays enables the interworking of different overlay
approaches to data and control plane methods. The different network
overlays are autonomous from a control and data plane perspective,
this in turn enables failure survivability across overlay domains.
This document specifies the mechanisms and procedures for the
distribution of control plane information across overlay sites and in
the uberlay as well as the lookup and forwarding procedures for
unicast and multicast traffic within and across overlays. The
specification also defines the procedures to support inter-overlay
mobility of EIDs and their integration with the intra-overlay EID
mobility procedures defined in draft-ietf-lisp-eid-mobility.
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 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Moreno, et al. Expires February 4, 2021 [Page 1]
Internet-Draft LISP Uberlay August 2020
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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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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 3
3. Interconnecting multiple LISP site-overlays via the Uberlay . 4
3.1. Logical Topology Considerations . . . . . . . . . . . . . 7
4. General Procedures . . . . . . . . . . . . . . . . . . . . . 9
4.1. Control Plane Procedures . . . . . . . . . . . . . . . . 10
4.1.1. Split-horizon at the Border xTRs . . . . . . . . . . 11
4.1.2. Border-xTR Resiliency . . . . . . . . . . . . . . . . 12
4.2. Resolution and Forwarding Procedures . . . . . . . . . . 12
4.2.1. Multi-overlay requests at border xTR . . . . . . . . 13
4.3. Default EID registration and treatment . . . . . . . . . 14
5. Multicast Specific Procedures . . . . . . . . . . . . . . . . 15
5.1. Inter-site-overlay Control Plane Procedures for Signal-
free multicast . . . . . . . . . . . . . . . . . . . . . 15
5.2. Border xTR Resolution and Forwarding procedures for
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