The Locator/ID Separation Protocol (LISP)
draft-ietf-lisp-rfc6830bis-04
Network Working Group D. Farinacci
Internet-Draft V. Fuller
Intended status: Standards Track D. Meyer
Expires: January 18, 2018 D. Lewis
Cisco Systems
A. Cabellos (Ed.)
UPC/BarcelonaTech
July 17, 2017
The Locator/ID Separation Protocol (LISP)
draft-ietf-lisp-rfc6830bis-04
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. The
map-cache is populated by the LISP Control-Plane protocol
[I-D.ietf-lisp-rfc6833bis].
LISP requires no change to either host protocol stacks or to underlay
routers and offers Traffic Engineering, multihoming and mobility,
among other features.
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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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 January 18, 2018.
Farinacci, et al. Expires January 18, 2018 [Page 1]
Internet-Draft LISP July 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Notation . . . . . . . . . . . . . . . . . . . . 4
3. Definition of Terms . . . . . . . . . . . . . . . . . . . . . 4
4. Basic Overview . . . . . . . . . . . . . . . . . . . . . . . 9
4.1. Packet Flow Sequence . . . . . . . . . . . . . . . . . . 11
5. LISP Encapsulation Details . . . . . . . . . . . . . . . . . 13
5.1. LISP IPv4-in-IPv4 Header Format . . . . . . . . . . . . . 14
5.2. LISP IPv6-in-IPv6 Header Format . . . . . . . . . . . . . 15
5.3. Tunnel Header Field Descriptions . . . . . . . . . . . . 16
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 . . . . . . . 22
9. Routing Locator Selection . . . . . . . . . . . . . . . . . . 23
10. Routing Locator Reachability . . . . . . . . . . . . . . . . 24
10.1. Echo Nonce Algorithm . . . . . . . . . . . . . . . . . . 27
10.2. RLOC-Probing Algorithm . . . . . . . . . . . . . . . . . 28
11. EID Reachability within a LISP Site . . . . . . . . . . . . . 29
12. Routing Locator Hashing . . . . . . . . . . . . . . . . . . . 30
13. Changing the Contents of EID-to-RLOC Mappings . . . . . . . . 31
13.1. Clock Sweep . . . . . . . . . . . . . . . . . . . . . . 32
13.2. Solicit-Map-Request (SMR) . . . . . . . . . . . . . . . 32
13.3. Database Map-Versioning . . . . . . . . . . . . . . . . 34
14. Multicast Considerations . . . . . . . . . . . . . . . . . . 34
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