LISP Delegated Database Tree
draft-ietf-lisp-ddt-02

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Document Type Active Internet-Draft (lisp WG)
Last updated 2015-02-17 (latest revision 2014-10-13)
Replaces draft-fuller-lisp-ddt
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Network Working Group                                          V. Fuller
Internet-Draft
Intended status: Experimental                                   D. Lewis
Expires: April 16, 2015                                       V. Ermagan
                                                           Cisco Systems
                                                                 A. Jain
                                                        Juniper Networks
                                                        October 13, 2014

                      LISP Delegated Database Tree
                       draft-ietf-lisp-ddt-02.txt

Abstract

   This draft describes the LISP Delegated Database Tree (LISP-DDT), a
   hierarchical, distributed database which embodies the delegation of
   authority to provide mappings from LISP Endpoint Identifiers (EIDs)
   to Routing Locators (RLOCs).  It is a statically-defined distribution
   of the EID namespace among a set of LISP-speaking servers, called DDT
   nodes.  Each DDT node is configured as "authoritative" for one or
   more EID-prefixes, along with the set of RLOCs for Map Servers or
   "child" DDT nodes to which more-specific EID-prefixes are delegated.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 16, 2015.

Copyright Notice

   Copyright (c) 2014 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

Fuller, et al.           Expires April 16, 2015                 [Page 1]
Internet-Draft        LISP Delegated Database Tree          October 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Definition of Terms . . . . . . . . . . . . . . . . . . . . .   4
   3.  Database organization . . . . . . . . . . . . . . . . . . . .   6
     3.1.  EID-prefix tree structure and instance IDs  . . . . . . .   6
     3.2.  Configuring prefix delegation . . . . . . . . . . . . . .   7
       3.2.1.  The root DDT node . . . . . . . . . . . . . . . . . .   7
   4.  The Map-Referral message  . . . . . . . . . . . . . . . . . .   7
     4.1.  Action codes  . . . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Referral set  . . . . . . . . . . . . . . . . . . . . . .   8
     4.3.  Incomplete flag . . . . . . . . . . . . . . . . . . . . .   9
   5.  DDT network elements and their operation  . . . . . . . . . .   9
     5.1.  DDT node  . . . . . . . . . . . . . . . . . . . . . . . .   9
       5.1.1.  Match of a delegated prefix (or sub-prefix) . . . . .   9
       5.1.2.  Missing delegation from an authoritative prefix . . .  10
     5.2.  DDT Map Server  . . . . . . . . . . . . . . . . . . . . .  10
     5.3.  DDT Map Resolver  . . . . . . . . . . . . . . . . . . . .  10
       5.3.1.  Queuing and sending DDT Map-Requests  . . . . . . . .  10
       5.3.2.  Receiving and following referrals . . . . . . . . . .  11
       5.3.3.  Handling referral errors  . . . . . . . . . . . . . .  13
       5.3.4.  Referral loop detection . . . . . . . . . . . . . . .  13
   6.  Pseudo Code and Decision Tree diagrams  . . . . . . . . . . .  14
     6.1.  Map Resolver processing of ITR Map-Request  . . . . . . .  14
       6.1.1.  Pseudo-code summary . . . . . . . . . . . . . . . . .  14
       6.1.2.  Decision tree diagram . . . . . . . . . . . . . . . .  14
     6.2.  Map Resolver processing of Map-Referral message . . . . .  15
       6.2.1.  Pseudo-code summary . . . . . . . . . . . . . . . . .  15
       6.2.2.  Decision tree diagram . . . . . . . . . . . . . . . .  17
     6.3.  DDT Node processing of DDT Map-Request message  . . . . .  19
       6.3.1.  Pseudo-code summary . . . . . . . . . . . . . . . . .  19
       6.3.2.  Decision tree diagram . . . . . . . . . . . . . . . .  19
   7.  Example topology and request/referral following . . . . . . .  20
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