Internet Engineering Task Force (IETF) A. Roy, Ed.
Request for Comments: 5820 Cisco Systems
Category: Experimental M. Chandra, Ed.
ISSN: 2070-1721 March 2010
Extensions to OSPF to Support Mobile Ad Hoc Networking
Abstract
This document describes extensions to OSPF to support mobile ad hoc
networks (MANETs). The extensions, called OSPF-OR (OSPF-Overlapping
Relay), include mechanisms for link-local signaling (LLS), an OSPF-
MANET interface, a simple technique to reduce the size of Hello
packets by only transmitting incremental state changes, and a method
for optimized flooding of routing updates. OSPF-OR also provides a
means to reduce unnecessary adjacencies to support larger MANETs.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This document is a product of the Internet Engineering
Task Force (IETF). It represents the consensus of the IETF
community. It has received public review and has been approved for
publication by the Internet Engineering Steering Group (IESG). Not
all documents approved by the IESG are 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/rfc5820.
Roy & Chandra Experimental [Page 1]
RFC 5820 Extensions to OSPF to Support MANETs March 2010
Copyright Notice
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it for publication as an RFC or to translate it into languages other
than English.
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RFC 5820 Extensions to OSPF to Support MANETs March 2010
Table of Contents
1. Introduction ....................................................4
1.1. Problem Statement ..........................................4
1.2. Motivation for Extending OSPF to Support MANETs ............5
2. Requirements Notation ...........................................5
3. Proposed Enhancements ...........................................5
3.1. OSPF-MANET Interface .......................................7
3.1.1. Interface Operation .................................8
3.1.2. LSA Formats and Examples ............................8
3.2. Incremental OSPF-MANET Hellos .............................12
3.2.1. The I Option Bit ...................................12
3.2.2. State Check Sequence TLV (SCS TLV) .................12
3.2.3. Neighbor Drop TLV ..................................13
3.2.4. Request From TLV (RF TLV) ..........................14
3.2.5. Full State For TLV (FSF TLV) .......................14
3.2.6. Neighbor Adjacencies ...............................15
3.2.7. Sending Hellos .....................................16
3.2.8. Receiving Hellos ...................................17
3.2.9. Interoperability ...................................19
3.2.10. Support for OSPF Graceful Restart .................19
3.3. Optimized Flooding (Overlapping Relays) ...................20
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