Network Working Group D. Lewis
Internet-Draft D. Meyer
Intended status: Experimental D. Farinacci
Expires: September 5, 2012 V. Fuller
Cisco Systems, Inc.
March 4, 2012
Interworking LISP with IPv4 and IPv6
draft-ietf-lisp-interworking-06.txt
Abstract
This document describes techniques for allowing sites running the
Locator/ID Separation Protocol (LISP) to interoperate with Internet
sites (which may be using either IPv4, IPv6, or both) but which 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 Routers (Proxy-ITRs)
(Section 5) to act as a intermediate LISP Ingress Tunnel Router (ITR)
for non-LISP-speaking hosts. Second the document adds Network
Address Translation (NAT) functionality to LISP Ingress and LISP
Egress Tunnel Routers (xTRs) 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.
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
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Lewis, et al. Expires September 5, 2012 [Page 1]
Internet-Draft Interworking LISP with IPv4 and IPv6 March 2012
This Internet-Draft will expire on September 5, 2012.
Copyright Notice
Copyright (c) 2012 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
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described in the Simplified BSD License.
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Internet-Draft Interworking LISP with IPv4 and IPv6 March 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 6
3. LISP Interworking Models . . . . . . . . . . . . . . . . . . . 7
4. Routable EIDs . . . . . . . . . . . . . . . . . . . . . . . . 8
4.1. Impact on Routing Table . . . . . . . . . . . . . . . . . 8
4.2. Requirement for sites to use BGP . . . . . . . . . . . . . 8
4.3. Limiting the Impact of Routable EIDs . . . . . . . . . . . 8
4.4. Use of Routable EIDs for sites transitioning to LISP . . . 8
5. Proxy Ingress Tunnel Routers . . . . . . . . . . . . . . . . . 10
5.1. Proxy-ITR EID announcements . . . . . . . . . . . . . . . 10
5.2. Packet Flow with Proxy-ITRs . . . . . . . . . . . . . . . 10
5.3. Scaling Proxy-ITRs . . . . . . . . . . . . . . . . . . . . 12
5.4. Impact of the Proxy-ITRs placement in the network . . . . 13
5.5. Benefit to Networks Deploying Proxy-ITRs . . . . . . . . . 13
6. Proxy Egress Tunnel Routers . . . . . . . . . . . . . . . . . 14
6.1. Packet Flow with Proxy Egress Tunnel Routers . . . . . . . 14
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