Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP)
RFC 7868
Document | Type |
RFC - Informational
(May 2016; Errata)
Was draft-savage-eigrp (individual)
|
|
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Authors | Donnie Savage , James Ng , Steven Moore , Donald Slice , Peter Paluch , Russ White | ||
Last updated | 2020-01-21 | ||
Stream | Independent Submission | ||
Formats | plain text html pdf htmlized (tools) htmlized with errata bibtex | ||
IETF conflict review | conflict-review-savage-eigrp | ||
Stream | ISE state | Published RFC | |
Consensus Boilerplate | Unknown | ||
Document shepherd | Adrian Farrel | ||
Shepherd write-up | Show (last changed 2015-08-17) | ||
IESG | IESG state | RFC 7868 (Informational) | |
Telechat date | |||
Responsible AD | (None) | ||
Send notices to | (None) | ||
IANA | IANA review state | Version Changed - Review Needed | |
IANA action state | RFC-Ed-Ack |
Independent Submission D. Savage Request for Comments: 7868 J. Ng Category: Informational S. Moore ISSN: 2070-1721 Cisco Systems D. Slice Cumulus Networks P. Paluch University of Zilina R. White LinkedIn May 2016 Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP) 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 as referenced in "Loop-Free Routing Using Diffusing Computations" (Garcia-Luna-Aceves 1993). The algorithm and procedures were researched, developed, and simulated by SRI International. Status of This Memo This document is not an Internet Standards Track specification; it is published for informational purposes. This is a contribution to the RFC Series, independently of any other RFC stream. The RFC Editor has chosen to publish this document at its discretion and makes no statement about its value for implementation or deployment. Documents approved for publication by the RFC Editor are not a candidate for any level of Internet Standard; see Section 2 of RFC 5741. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7868. Savage, et al. Informational [Page 1] RFC 7868 Cisco's EIGRP May 2016 Copyright Notice Copyright (c) 2016 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 (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. This document may not be modified, and derivative works of it may not be created, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction ....................................................5 2. Conventions .....................................................5 2.1. Requirements Language ......................................5 2.2. Terminology ................................................5 3. The Diffusing Update Algorithm (DUAL) ...........................9 3.1. Algorithm Description ......................................9 3.2. Route States ..............................................10 3.3. Feasibility Condition .....................................11 3.4. DUAL Message Types ........................................13 3.5. DUAL Finite State Machine (FSM) ...........................13 3.6. DUAL Operation -- Example Topology ........................18 4. EIGRP Packets ..................................................20 4.1. UPDATE Packets ............................................21 4.2. QUERY Packets .............................................21 4.3. REPLY Packets .............................................22 4.4. Exception Handling ........................................22 4.4.1. Active Duration (SIA) ..............................22 4.4.1.1. SIA-QUERY .................................23 4.4.1.2. SIA-REPLY .................................24 5. EIGRP Operation ................................................25 5.1. Finite State Machine ......................................25 5.2. Reliable Transport Protocol ...............................25 5.2.1. Bandwidth on Low-Speed Links .......................32 5.3. Neighbor Discovery/Recovery ...............................32 5.3.1. Neighbor Hold Time .................................32 5.3.2. HELLO Packets ......................................33 5.3.3. UPDATE Packets .....................................33 5.3.4. Initialization Sequence ............................34 5.3.5. Neighbor Formation .................................35 5.3.6. QUERY Packets during Neighbor Formation ............35Show full document text