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Comparison of OR and MDR Overhead and Delivery Ratios

Comparison of OR and MDR Overhead and Delivery Ratios. Stan Ratliff Cisco Systems. Description of Flooding Algorithms. Overlapping Relays (OR) Described in draft-chandra-ospf-manet-ext-03 Based on Multipoint Relay (MPR) flooding algorithm in OLSR MANET Designated Router (MDR)

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Comparison of OR and MDR Overhead and Delivery Ratios

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  1. Comparison of OR and MDR Overhead and Delivery Ratios Stan Ratliff Cisco Systems

  2. Description of Flooding Algorithms • Overlapping Relays (OR) • Described in draft-chandra-ospf-manet-ext-03 • Based on Multipoint Relay (MPR) flooding algorithm in OLSR • MANET Designated Router (MDR) • Described in draft-ogier-manet-ospf-extension-05

  3. Changes to OR algorithm • Added functionality described in draft-roy-ospf-smart-peering-00 • If new neighbor already in SPT, mark neighbor as FULL with respect to link advertisement. • Defer DB synchronization until necessary.

  4. Changes to Smart Peering • Added functionality to smart peering • Missed deadline for posting new draft for this IETF; posting to come. • Additions are referred to as Unsynchronized Adjacencies

  5. Unsynchronized Adjacencies • After new neighbor found in SPT and DB sync deferred, • Link to new neighbor marked as Unsynchronized (New ‘U’ Bit) in LSA • A “special” SPT is created, ignoring links with U-bit set. • This new SPT is consulted to determine whether DB synchronization is required, and is updated for all link state changes.

  6. Other Changes from DT deliverable • Velocity was increased to 16 meters/sec. • Pause Time was decreased to 1. • ACK Cache timeout was increased from dead interval (6 sec) to 100 seconds • Multiple simulations were run, varying radio range from 100 meters to 200 meters in 20 meter increments.

  7. Conclusions • The performance of OR has been enhanced with use of Unsynchronized Adjacencies. • Overhead compared to Bi-Connected MDR is consistently lower. • The higher-mobility characteristics tested are based on input provided by our customers. • The Design Team should open the results and solicit input from the community in the interest of obtaining data on real-life deployment scenarios to base its final recommendation on.

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