Cisco's Enhanced Interior Gateway Routing Protocol (EIGRP)
RFC 7868
| Document | Type |
RFC - Informational
(May 2016; No errata)
Was draft-savage-eigrp (individual)
|
|
|---|---|---|---|
| Last updated | 2016-05-25 | ||
| Stream | ISE | ||
| Formats | plain text pdf html bibtex | ||
| IETF conflict review | conflict-review-savage-eigrp | ||
| Stream | ISE state | Published RFC | |
| Consensus Boilerplate | Unknown | ||
| Document shepherd | Nevil Brownlee | ||
| 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
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This document may not be modified, and derivative works of it may not
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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
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