Network Working Group D. Farinacci
Internet-Draft V. Fuller
Intended status: Experimental D. Meyer
Expires: November 5, 2012 D. Lewis
cisco Systems
May 4, 2012
Locator/ID Separation Protocol (LISP)
draft-ietf-lisp-23
Abstract
This draft describes a network layer based protocol that enables
separation of IP addresses into two new numbering spaces: Endpoint
Identifiers (EIDs) and Routing Locators (RLOCs). No changes are
required to either host protocol stacks or to the "core" of the
Internet infrastructure. LISP can be incrementally deployed, without
a "flag day", and offers traffic engineering, multi-homing, and
mobility benefits to early adopters, even when there are relatively
few LISP-capable sites.
Design and development of LISP was largely motivated by the problem
statement produced by the October 2006 IAB Routing and Addressing
Workshop.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 5, 2012.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
Farinacci, et al. Expires November 5, 2012 [Page 1]
Internet-Draft Locator/ID Separation Protocol (LISP) May 2012
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.
Table of Contents
1. Requirements Notation . . . . . . . . . . . . . . . . . . . . 5
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 8
4. Basic Overview . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Packet Flow Sequence . . . . . . . . . . . . . . . . . . . 16
5. LISP Encapsulation Details . . . . . . . . . . . . . . . . . . 18
5.1. LISP IPv4-in-IPv4 Header Format . . . . . . . . . . . . . 19
5.2. LISP IPv6-in-IPv6 Header Format . . . . . . . . . . . . . 19
5.3. Tunnel Header Field Descriptions . . . . . . . . . . . . . 21
5.4. Dealing with Large Encapsulated Packets . . . . . . . . . 25
5.4.1. A Stateless Solution to MTU Handling . . . . . . . . . 25
5.4.2. A Stateful Solution to MTU Handling . . . . . . . . . 26
5.5. Using Virtualization and Segmentation with LISP . . . . . 26
6. EID-to-RLOC Mapping . . . . . . . . . . . . . . . . . . . . . 28
6.1. LISP IPv4 and IPv6 Control Plane Packet Formats . . . . . 28
6.1.1. LISP Packet Type Allocations . . . . . . . . . . . . . 30
6.1.2. Map-Request Message Format . . . . . . . . . . . . . . 30
6.1.3. EID-to-RLOC UDP Map-Request Message . . . . . . . . . 33
6.1.4. Map-Reply Message Format . . . . . . . . . . . . . . . 34
6.1.5. EID-to-RLOC UDP Map-Reply Message . . . . . . . . . . 38
6.1.6. Map-Register Message Format . . . . . . . . . . . . . 40
6.1.7. Map-Notify Message Format . . . . . . . . . . . . . . 42
6.1.8. Encapsulated Control Message Format . . . . . . . . . 43
6.2. Routing Locator Selection . . . . . . . . . . . . . . . . 45
6.3. Routing Locator Reachability . . . . . . . . . . . . . . . 47
6.3.1. Echo Nonce Algorithm . . . . . . . . . . . . . . . . . 49
6.3.2. RLOC Probing Algorithm . . . . . . . . . . . . . . . . 50
6.4. EID Reachability within a LISP Site . . . . . . . . . . . 51
datatracker.ietf.org