Interworking between Locator/ID Separation Protocol (LISP) and Non-LISP Sites
RFC 6832
Internet Engineering Task Force (IETF) D. Lewis
Request for Comments: 6832 D. Meyer
Category: Experimental D. Farinacci
ISSN: 2070-1721 Cisco Systems
V. Fuller
January 2013
Interworking between Locator/ID Separation Protocol (LISP) and
Non-LISP Sites
Abstract
This document describes techniques for allowing sites running the
Locator/ID Separation Protocol (LISP) to interoperate with Internet
sites that may be using either IPv4, IPv6, or both but that are not
running LISP. A fundamental property of LISP-speaking sites is that
they use Endpoint Identifiers (EIDs), rather than traditional IP
addresses, in the source and destination fields of all traffic they
emit or receive. While EIDs are syntactically identical to IPv4 or
IPv6 addresses, normally routes to them are not carried in the global
routing system, so an interoperability mechanism is needed for non-
LISP-speaking sites to exchange traffic with LISP-speaking sites.
This document introduces three such mechanisms. The first uses a new
network element, the LISP Proxy Ingress Tunnel Router (Proxy-ITR), to
act as an intermediate LISP Ingress Tunnel Router (ITR) for non-LISP-
speaking hosts. Second, this document adds Network Address
Translation (NAT) functionality to LISP ITRs and LISP Egress Tunnel
Routers (ETRs) to substitute routable IP addresses for non-routable
EIDs. Finally, this document introduces the Proxy Egress Tunnel
Router (Proxy-ETR) to handle cases where a LISP ITR cannot send
packets to non-LISP sites without encapsulation.
Lewis, et al. Experimental [Page 1]
RFC 6832 LISP and Non-LISP Interworking January 2013
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This document is a product of the Internet Engineering
Task Force (IETF). It represents the consensus of the IETF
community. It has received public review and has been approved for
publication by the Internet Engineering Steering Group (IESG). Not
all documents approved by the IESG are a candidate for any level of
Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6832.
Copyright Notice
Copyright (c) 2013 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
(http://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
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Lewis, et al. Experimental [Page 2]
RFC 6832 LISP and Non-LISP Interworking January 2013
Table of Contents
1. Introduction ....................................................3
2. Definition of Terms .............................................5
3. LISP Interworking Models ........................................6
4. Routable EIDs ...................................................7
4.1. Impact on Routing Table ....................................7
4.2. Requirement for Sites to Use BGP ...........................7
4.3. Limiting the Impact of Routable EIDs .......................7
4.4. Use of Routable EIDs for Sites Transitioning to LISP .......7
5. Proxy Ingress Tunnel Routers ....................................8
5.1. Proxy-ITR EID Announcements ................................8
5.2. Packet Flow with Proxy-ITRs ................................9
5.3. Scaling Proxy-ITRs ........................................11
5.4. Impact of the Proxy-ITR's Placement in the Network ........11
5.5. Benefit to Networks Deploying Proxy-ITRs ..................11
6. Proxy Egress Tunnel Routers ....................................12
6.1. Packet Flow with Proxy-ETRs ...............................12
7. LISP-NAT .......................................................13
7.1. Using LISP-NAT with LISP-NR EIDs ..........................14
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