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Clausen 5 Intended status: Standards Track LIX, Ecole Polytechnique 6 Expires: January 13, 2014 July 12, 2013 8 Routing MPR Optimization for the Optimized Link State Routing Protocol 9 version 2 (OLSRv2) 10 draft-dearlove-manet-olsrv2-rmpr-optimization-00 12 Abstract 14 This specification updates the Optimized Link State Routing Protocol 15 version 2 (OLSRv2) with an optimization to improve the selection of 16 routing MPRs. The optimization retains full interoperability between 17 implementations of OLSRv2 with and without this optimization. 19 Status of this Memo 21 This Internet-Draft is submitted in full conformance with the 22 provisions of BCP 78 and BCP 79. 24 Internet-Drafts are working documents of the Internet Engineering 25 Task Force (IETF). Note that other groups may also distribute 26 working documents as Internet-Drafts. The list of current Internet- 27 Drafts is at http://datatracker.ietf.org/drafts/current/. 29 Internet-Drafts are draft documents valid for a maximum of six months 30 and may be updated, replaced, or obsoleted by other documents at any 31 time. It is inappropriate to use Internet-Drafts as reference 32 material or to cite them other than as "work in progress." 34 This Internet-Draft will expire on January 13, 2014. 36 Copyright Notice 38 Copyright (c) 2013 IETF Trust and the persons identified as the 39 document authors. All rights reserved. 41 This document is subject to BCP 78 and the IETF Trust's Legal 42 Provisions Relating to IETF Documents 43 (http://trustee.ietf.org/license-info) in effect on the date of 44 publication of this document. Please review these documents 45 carefully, as they describe your rights and restrictions with respect 46 to this document. Code Components extracted from this document must 47 include Simplified BSD License text as described in Section 4.e of 48 the Trust Legal Provisions and are provided without warranty as 49 described in the Simplified BSD License. 51 Table of Contents 53 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 54 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 55 3. Applicability Statement . . . . . . . . . . . . . . . . . . . . 3 56 4. Routing MPR Selection . . . . . . . . . . . . . . . . . . . . . 4 57 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 58 6. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 59 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5 60 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 5 61 8.1. Normative References . . . . . . . . . . . . . . . . . . . 5 62 8.2. Informative References . . . . . . . . . . . . . . . . . . 5 63 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 65 1. Introduction 67 The Optimized Link State Routing Protocol, version 2 [OLSRv2] is a 68 proactive link state routing protocol designed for use in mobile ad 69 hoc networks (MANETs) [RFC2501]. This document improves one area of 70 that specification. 72 One improvement included in OLSRv2, compared to its predecessor 73 described in [RFC3626], is the use of link metrics, rather than 74 minimum hop routing. A rationale for how link metrics were included 75 in OLSRv2 is documented in [RFC6966-to-be]. However, one aspect of 76 the use of link metrics described in [RFC6966-to-be], the removal of 77 some unnecessarily selected routing MPRs, was not included in 78 [OLSRv2]. This specification updates OLSRv2 to include this 79 optimization. 81 Note that an implementation using this optimization is not strictly 82 compliant with the current specification [OLSRv2], but is fully 83 interoperable with implementations not using this optimization. This 84 specification updates [OLSRv2] to specify that an implementation 85 using this removal is compliant with the protocol OLSRv2. 87 2. Terminology 89 The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 90 "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and 91 "OPTIONAL" in this document are to be interpreted as described in 92 [RFC2119]. 94 Additionally, this document uses the terminology of [OLSRv2]. 96 3. Applicability Statement 98 This specification updates [OLSRv2]. As such it is applicable to all 99 implementations of this protocol. The optimization presented in this 100 specification is simply permissive, it allows an additional 101 optimization, and there is no requirement for any implementation to 102 include it. However inclusion of this optimization is advised, it 103 can, in some cases, create smaller and fewer messages, without ever 104 having the opposite effect. 106 [OLSRv2] defines the properties for the selection of routing MPRs 107 (multipoint relays) from among a router's symmetric 1-hop neighbors 108 as properties that correspond first to that the selected MPRs consist 109 of a set of symmetric 1-hop neighbors that cover all the symmetric 110 2-hop neighbors, and second that they do so retaining a minimum 111 distance route (1-hop, if present, or 2-hop) to each symmetric 2-hop 112 neighbor. The discussion in the latter part of Section 6.2 of 113 [RFC6966-to-be] indicates that this requirement is over-prescriptive 114 for routing MPR selection. The update to [OLSRv2] described in this 115 specification permits a router to use the described optimization, 116 while still being considered compliant. 118 Note that, whether considered compliant or not, a router that 119 implements the optimization, described in this specification, will 120 interoperate successfully with routers not implementing this 121 optimization. 123 4. Routing MPR Selection 125 A set of routing MPRs created as specified in [OLSRv2] MAY be 126 optimized in the following manner. Note that this uses the notation 127 of Section 18.3 of [OLSRv2]: 129 1. If there is a sequence x_0, ..., x_n of elements of N1 such that: 131 * x_0 is a routing MPR, 133 * x_1, ... , x_n have corresponding elements y_1, ..., y_n of 134 N2, and 136 * d1(x_0) + d2(x_0,y_1) + ... + d2(x_m-1,y_m) < d1(x_m) for m = 137 1, ... , n, 139 then x_1 to x_n may be removed from the set of routing MPRs, if 140 selected. 142 Note that "corresponding elements" in N1 and N2 means that these 143 elements represent the same router. All of this information is 144 available from information gathered by NHDP [RFC6130]. 146 It is RECOMMENDED that all OLSRv2 routers use this optimization. 148 5. IANA Considerations 150 This document has no actions for IANA. 152 6. Security Considerations 154 The update to [OLSRv2] does not introduce any new protocol signals, 155 compared to the already published specifications of the protocol, nor 156 does it change the processing of any received protocol signals. 158 This update to [OLSRv2] permits a compliant implementation of OLSRv2 159 to (potentially) eliminate some redundant information from the 160 routing MPR sets otherwise generated by the algorithms described in 161 [OLSRv2], and therefore also eliminate the need for including that 162 information in generated TC messages. Because this information is 163 not used when included, this update to [OLSRv2] does not present any 164 additional security considerations, beyond those described in 165 [OLSRv2]. 167 7. Acknowledgments 169 The authors would like to gratefully acknowledge Philippe Jacquet 170 (Alcatel-Lucent) for intense technical discussions and comments. 172 8. References 174 8.1. Normative References 176 [OLSRv2] Clausen, T., Dearlove, C., Jacquet, P., and U. Herberg, 177 "The Optimized Link State Routing Protocol version 2", 178 work in progress draft-ietf-manet-olsrv2-19, March 2013. 180 [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate 181 Requirement Levels", BCP 14, RFC 2119, March 1997. 183 [RFC6130] Clausen, T., Dean, J., and C. Dearlove, "Mobile Ad Hoc 184 Network (MANET) Neighborhood Discovery Protocol (NHDP)", 185 RFC 6130, April 2011. 187 8.2. Informative References 189 [RFC2501] Macker, J. and S. Corson, "Mobile Ad hoc Networking 190 (MANET): Routing Protocol Performance Issues and 191 Evaluation Considerations", RFC 2501, January 1999. 193 [RFC3626] Clausen, T. and P. Jacquet, "The Optimized Link State 194 Routing Protocol", RFC 3626, October 2003. 196 [RFC6966-to-be] 197 Clausen, T., Dearlove, C., and P. Jacquet, "Rationale for 198 the Use of Link Metrics in the Optimized Link State 199 Routing Protocol Version 2 (OLSRv2)", RFC 6966, TBD 2013. 201 Authors' Addresses 203 Christopher Dearlove 204 BAE Systems Advanced Technology Centre 205 West Hanningfield Road 206 Great Baddow, Chelmsford 207 United Kingdom 209 Phone: +44 1245 242194 210 Email: chris.dearlove@baesystems.com 211 URI: http://www.baesystems.com/ 213 Thomas Heide Clausen 214 LIX, Ecole Polytechnique 216 Phone: +33 6 6058 9349 217 Email: T.Clausen@computer.org 218 URI: http://www.ThomasClausen.org/