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4 th International Conference on Systems and Network Communications IEEE ICSNC 2009 Porto, 20-25 September 2009

Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks. Emmanuel Baccelli Juan Antonio Cordero Philippe Jacquet Équipe Hipercom, INRIA Rocquencourt (France). 4 th International Conference on Systems and Network Communications IEEE ICSNC 2009 Porto, 20-25 September 2009.

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4 th International Conference on Systems and Network Communications IEEE ICSNC 2009 Porto, 20-25 September 2009

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  1. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks Emmanuel Baccelli Juan Antonio Cordero Philippe Jacquet Équipe Hipercom, INRIA Rocquencourt (France) 4th International Conference on Systems and Network Communications IEEE ICSNC 2009 Porto, 20-25 September 2009

  2. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Stating the Problem OSPF over MANET LSDB synchronization (adjacencies) Link State Flooding (LSAs) Flooding Optimization Topology Reduction Adjacency Selection Multi-Point Relaying Techniques RFC 5449

  3. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 multi-point relay Multi-Point Relaying (MPR) Techniques Usual flooding MPR flooding

  4. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Principle 1 User data only forwarded over shortest paths Principle 2 User data only forwarded over LSDB-synchronized (adjacent) links OSPF Legacy

  5. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Elements of OSPF MANET Configuration 1 Configuration 2 1.1 1.2 2.1 2.2 RFC 5449 Flooding Optimization MPR Flooding Adjacency Selection Smart Peering MPR Adj. Selection SLO-T Selection Topology Reduction Unsynchr. Adjacencies No reduction MPR Topology Reduction

  6. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Flooding Optimization MPR Candidates/Scope: bidirectional and adjacent neighbors Relays are selected among 1-hop neighbors so that they cover all 2-hop neighbors TWOWAY neighbors RFC 5449 Cfs. 2.1, 2.2 Multi-Point Relays Selection FULL adjacent neighbors Cfs. 1.1, 1.2 • Size versus quality

  7. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Configuration 1 Configuration 2 New 2-way neighbor 1.1 1.2 2.1 2.2 RFC 5449 42 42 Flooding Optimization MPR Flooding SPT? 13 13 • Link A-B adjacent if: • B is MPR of A • (or vice versa) Adjacency Selection Smart Peering MPR Adj. Selection SLO-T Selection 37 37 Topology Reduction Unsynchr. Adjacencies No reduction MPR Topology Reduction Adjacent Non-Adjacent SLO-T Reduction Smart Peering MPR Adjacency Reduction Adjacency Selection MPR Adjacency, Smart Peering and SLO-T Reduction

  8. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 MPR Adjacency Reduction Smart Peering SLO-T Adjacency Selection Smart Peering, MPR Adjacency and SLO-T Reduction • Adjacency stability & size • Shortest paths

  9. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Configuration 1 Configuration 2 1.1 1.2 2.1 2.2 RFC 5449 Flooding Optimization MPR Flooding Adjacency Selection Smart Peering MPR Adj. Selection SLO-T Selection Topology Reduction Unsynchr. Adjacencies No reduction MPR Topology Reduction Topology Reduction Smart Peering and MPR Topology Reduction

  10. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Topology Reduction Smart Peering and MPR Topology Reduction Advertized links in Router-LSAs • Advertize shortest paths ? • Synchronize shortest paths (adjacencies) ?

  11. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Total traffic vs injected data traffic Topology Reduction Smart Peering and MPR Topology Reduction

  12. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 • Principle 1 • User data only forwarded over shortest paths • Wireless metrics beyond hop-count Hybrid Configuration + • Principle 2 • User data only forwarded over LSDB-synchronized (adjacent) links • Short-life links synchronization vs. routing • RFC 5449 (cf. 2.1) • MPR Flooding • Adjacency Backup • MPR Adj. Selection • MPR Topology Red. Discussion OSPF legacy in MANET operation

  13. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Hybrid Configuration Structure MPR + SP Configuration 1 Configuration 2 1.1 1.2 2.1 2.2 Flooding Optimization MPR Flooding Adjacency Selection Smart Peering MPR Adj. Selection SLO-T Selection Topology Reduction Unsynchr. Adjacencies Smart Peering MPR Topology Reduction (unsynchr. adj.)

  14. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Hybrid Configuration Performance MPR + SP More efficient for dense networks Less vulnerable to network growth Dramatically cheaper in terms of overhead Delivery ratio vs # nodes Control overhead vs # nodes

  15. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Conclusions and Future Work • OSPF with respect to data paths • P1, Optimality* deep impact of shortest paths’ presence • P2, Synchronization weak effect (in MANET scenarios) • Two MPR-based extensions for MANET operation • P1+P2 RFC 5449 (conf. 2.1) • Only P1 Hybrid MPR+SP • (outperforming the evaluated configurations) • Future work • Refine the evaluation (real testbeds, wider simulation scopes) • Extend the MPR techniques to other IGPs (IS-IS…) • Metrics discussion

  16. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Questions? E-mail: cordero@lix.polytechnique.fr

  17. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Backup Slides

  18. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Documentation of OSPF MANET Extensions • Simulations run over the Georgia Tech Network Simulator (GTNetS) • Implementation based on the Quagga/Zebra OSPFv3 daemon (ospf6d) • Extension for Configurations 1.1, 1.2 • Following the IETF Internet Draft “Extensions to OSPF to Support Mobile Ad Hoc Networking” from M. Chandra and A. Roy (work in progress, draft-ietf-ospf-manet-or-02) • Implementation provided by Boeing and documented in the Boeing Technical Report D950-10897-1, by T. R. Henderson, P. A. Spagnolo and G. Pei • Extension for Configurations 2.1, 2.2 • Following the IETF RFC 5449 “OSPF Multipoint Relay (MPR) Extension for Ad Hoc Networks” from E. Baccelli, P. Jacquet, D. Nguyen and T. Clausen • SLO-T mechanism following the INRIA Research Report n. 6148, by P. Jacquet. • Implementation provided by INRIA, publicly available in www.emmanuelbaccelli.org/ospf

  19. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Simulation Environment • General Simulation Parameters • 20 samples/experiment • Data traffic pattern • Constant Bit Rate UDP flow • Packet size: 1472 bytes • Packet rate: 85 pkts/sec • Scenario • Square grid • Grid size: 400x400 m • Wireless α: 0,5 • Node configuration • Radio range: 150 m • MAC protocol: IEEE 802.11b • Node mobility • Random waypoint model • Pause: 40 sec • Speed: [0, vmx] • vmx= 0, 5, 10, 15 m/s • (uniform) • Performed Experiments • Fixed size grid • Constant density • Data traffic sweep • Link quality (α) sweep • OSPF Configuration • Standard Parameters • HelloInterval: 2 sec • DeadInterval: 6 sec • RxmtInterval: 5 sec • MinLSInterval: 5 sec • MinLSArrival: 1 sec • Confs. 1.1, 1.2 • AckInterval: 1,8 sec • PushbackInterval: 2 sec • Confs. 2.1, 2.2 • AckInterval: 1,8 sec

  20. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 The α parameter

  21. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 The SLO-T Algorithm Relative Neighbor Graph (RNG) A B C1 C3 C2 Synchronized Link Overlay, Triangle elimination A B C 42 SLO-T (unit cost) 13 37

  22. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Other Pictures (1): General Parameters

  23. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Other Pictures (2): Control & Data Traffic

  24. Multi-Point Relaying Techniques with OSPF on Ad Hoc Networks, IEEE ICSNC 2009 Other Pictures (3): Adjacency Characterization

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