Enhanced Interior Gateway Routing Protocol
draft-savage-eigrp-03

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Document Type Active Internet-Draft (individual)
Last updated 2015-08-18 (latest revision 2015-08-17)
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Intended RFC status Informational
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Send notices to "Nevil Brownlee" <rfc-ise@rfc-editor.org>
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Internet Engineering Task Force                                         D. Savage
Internet-Draft                                                              J. Ng
Intended status: Informational                                           S. Moore
Expires:   Febuary, 2016                                            Cisco Systems
                                                                         D. Slice
                                                                 Cumulus Networks
                                                                        P. Paluch
                                                             University of Zilina
                                                                         R. White
                                                                         Ericsson
                                                                      16 Aug 2015

                Enhanced Interior Gateway Routing Protocol
                       draft-savage-eigrp-03.txt

Abstract

This document describes the protocol design and architecture for
Enhanced Interior Gateway Routing Protocol (EIGRP). EIGRP is a routing
protocol based on Distance Vector technology. The specific algorithm
used is called DUAL, a Diffusing Update Algorithm [4]. The algorithm
and procedures were researched, developed, and simulated by SRI
International.

Requirements Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [1].

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  Febuary 16, 2016.

Copyright Notice

Copyright (c) 2015 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
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languages other than English.

Savage, et al.                  Expires August 16, 2015                    [1]

Internet-Draft                          EIGRP                     August, 2015
 Table of Contents

 1 Introduction ........................................................ 5
 2 Terminology ......................................................... 5
 3 The DUAL Diffusing Update Algorithm ................................. 8
   3.1 Algorithm Description ........................................... 8
   3.2 Route States .................................................... 8
   3.3 Feasibility Condition ........................................... 9
   3.4 DUAL Message Types ............................................. 11
   3.5 DUAL Finite State Machine (FSM) ................................ 11
   3.6 DUAL Operation - Example Topology .............................. 15
 4 EIGRP Packets ...................................................... 17
   4.1 UPDATE Packets ................................................. 17
   4.2 QUERY Packets .................................................. 17
   4.3 REPLY Packets .................................................. 18
   4.4 Exception Handling ............................................. 18
     4.4.1 Active Duration (Stuck-in-Active) .......................... 18
       4.4.1.1 SIA-QUERY .............................................. 18
       4.4.1.2 SIA-REPLY .............................................. 19
 5 EIGRP Protocol Operation ........................................... 20
   5.1 Finite State Machine ........................................... 20
   5.2 Reliable Transport Protocol .................................... 20
     5.2.1 Bandwidth on Low-Speed Links ............................... 25
   5.3 Neighbor Discovery/Recovery .................................... 25
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