The Locator/ID Separation Protocol (LISP)
draft-ietf-lisp-rfc6830bis-36

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Network Working Group                                       D. Farinacci
Internet-Draft                                               lispers.net
Obsoletes: 6830 (if approved)                                  V. Fuller
Intended status: Standards Track             vaf.net Internet Consulting
Expires: May 22, 2021                                           D. Meyer
                                                               1-4-5.net
                                                                D. Lewis
                                                           Cisco Systems
                                                       A. Cabellos (Ed.)
                                                       UPC/BarcelonaTech
                                                       November 18, 2020

               The Locator/ID Separation Protocol (LISP)
                     draft-ietf-lisp-rfc6830bis-36

Abstract

   This document describes the Data-Plane protocol for the Locator/ID
   Separation Protocol (LISP).  LISP defines two namespaces, End-point
   Identifiers (EIDs) that identify end-hosts and Routing Locators
   (RLOCs) that identify network attachment points.  With this, LISP
   effectively separates control from data, and allows routers to create
   overlay networks.  LISP-capable routers exchange encapsulated packets
   according to EID-to-RLOC mappings stored in a local Map-Cache.

   LISP requires no change to either host protocol stacks or to underlay
   routers and offers Traffic Engineering, multihoming and mobility,
   among other features.

   This document obsoletes RFC 6830.

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
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   Drafts is at https://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 May 22, 2021.

Farinacci, et al.         Expires May 22, 2021                  [Page 1]
Internet-Draft                    LISP                     November 2020

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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope of Applicability  . . . . . . . . . . . . . . . . .   4
   2.  Requirements Notation . . . . . . . . . . . . . . . . . . . .   5
   3.  Definition of Terms . . . . . . . . . . . . . . . . . . . . .   5
   4.  Basic Overview  . . . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  Deployment on the Public Internet . . . . . . . . . . . .  10
     4.2.  Packet Flow Sequence  . . . . . . . . . . . . . . . . . .  11
   5.  LISP Encapsulation Details  . . . . . . . . . . . . . . . . .  13
     5.1.  LISP IPv4-in-IPv4 Header Format . . . . . . . . . . . . .  13
     5.2.  LISP IPv6-in-IPv6 Header Format . . . . . . . . . . . . .  14
     5.3.  Tunnel Header Field Descriptions  . . . . . . . . . . . .  15
   6.  LISP EID-to-RLOC Map-Cache  . . . . . . . . . . . . . . . . .  20
   7.  Dealing with Large Encapsulated Packets . . . . . . . . . . .  20
     7.1.  A Stateless Solution to MTU Handling  . . . . . . . . . .  21
     7.2.  A Stateful Solution to MTU Handling . . . . . . . . . . .  22
   8.  Using Virtualization and Segmentation with LISP . . . . . . .  23
   9.  Routing Locator Selection . . . . . . . . . . . . . . . . . .  23
   10. Routing Locator Reachability  . . . . . . . . . . . . . . . .  25
     10.1.  Echo Nonce Algorithm . . . . . . . . . . . . . . . . . .  27
   11. EID Reachability within a LISP Site . . . . . . . . . . . . .  28
   12. Routing Locator Hashing . . . . . . . . . . . . . . . . . . .  28
   13. Changing the Contents of EID-to-RLOC Mappings . . . . . . . .  30
     13.1.  Locator-Status-Bits  . . . . . . . . . . . . . . . . . .  30
     13.2.  Database Map-Versioning  . . . . . . . . . . . . . . . .  30
   14. Multicast Considerations  . . . . . . . . . . . . . . . . . .  31