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Internet Routing Dr. Miled M. Tezeghdanti May 8, 2012 Dr. Miled M. - PowerPoint PPT Presentation

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Internet Routing Dr. Miled M. Tezeghdanti May 8, 2012 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 1 / 71 Introduction Networks may be interconnected using Repeaters Work at the Physical layer Bridges Work at the Data-Link

  1. Internet Routing Dr. Miled M. Tezeghdanti May 8, 2012 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 1 / 71

  2. Introduction Networks may be interconnected using Repeaters Work at the Physical layer Bridges Work at the Data-Link layer Bridging uses physical addressing Spanning Tree Protocol and Algorithm ”STP” Routers Work at the Network layer Routing uses logical addressing Routing computes routes for available networks and stores them in a routing table Static Routing Dynamic Routing Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 2 / 71

  3. Static Routing Manual Process Network Administrator route command route add 10.1.2.0/24 10.1.1.2 route delete 10.1.2.0/24 10.1.1.2 Not tolerant to failures Repair the failure Change the route No processing overhead No traffic overhead Good for default routes and stub networks Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 3 / 71

  4. Dynamic Routing Automated Process Routing Protocol IGP vs EGP (Interior Gateway Protocol vs Exterior Gateway Protocol) Metric-based vs Policy-based Distance Vector vs Link State Tolerant to failures Processing overhead Traffic overhead Good for large networks Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 4 / 71

  5. Routing Protocol Characteristics Convergence time Scalability Resource usage (CPU and Bandwidth) Implementation and maintenance Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 5 / 71

  6. Distance Vector Routing Distance or metric of a destination Vector or direction to that destination Each router knows only the distance or metric to each destination and the direction (next-hop) to take to get there. Routing information is exchanged between directly connected neighbors RIP ”Routing Information Protocol” Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 6 / 71

  7. RIP Each router can reach directly connected networks with a distance 1 Each router sends periodically to its neighbors the content of its routing table Each router learns new routes from its neighbors Each router stores for each destination the best route with the minimum distance Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 7 / 71

  8. RIP Example R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

  9. RIP Example Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.1.0/24 C 1 10.1.1.0/24 C 1 10.1.3.0/24 C 1 10.1.2.0/24 C 1 10.1.3.0/24 C 1 10.1.6.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.2.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.7.0/24 C 1 10.1.7.0/24 C 1 10.1.6.0/24 C 1 10.1.8.0/24 C 1 10.1.8.0/24 C 1 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

  10. RIP Example Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.1.0/24 C 1 10.1.1.0/24 C 1 10.1.3.0/24 C 1 10.1.2.0/24 C 1 10.1.3.0/24 C 1 10.1.6.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.2.0/24 10.1.1.1 2 R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.2.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.7.0/24 C 1 10.1.7.0/24 C 1 10.1.6.0/24 C 1 10.1.1.0/24 10.1.2.1 2 10.1.8.0/24 C 1 10.1.8.0/24 C 1 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

  11. RIP Example Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.1.0/24 C 1 10.1.1.0/24 C 1 10.1.3.0/24 C 1 10.1.2.0/24 C 1 10.1.3.0/24 C 1 10.1.6.0/24 C 1 10.1.3.0/24 10.1.1.2 2 10.1.4.0/24 C 1 10.1.1.0/24 10.1.3.1 2 10.1.4.0/24 10.1.1.2 2 10.1.5.0/24 C 1 10.1.4.0/24 10.1.3.1 2 10.1.5.0/24 10.1.1.2 2 10.1.2.0/24 10.1.1.1 2 10.1.5.0/24 10.1.3.1 2 10.1.2.0/24 10.1.3.1 3 R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.2.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.7.0/24 C 1 10.1.7.0/24 C 1 10.1.6.0/24 C 1 10.1.1.0/24 10.1.2.1 2 10.1.8.0/24 C 1 10.1.8.0/24 C 1 10.1.1.0/24 10.1.4.1 2 10.1.1.0/24 10.1.5.1 2 10.1.3.0/24 10.1.4.1 2 10.1.3.0/24 10.1.5.1 2 10.1.5.0/24 10.1.4.1 2 10.1.4.0/24 10.1.5.1 2 10.1.2.0/24 10.1.4.1 3 10.1.2.0/24 10.1.5.1 3 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

  12. RIP Example Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.1.0/24 C 1 10.1.1.0/24 C 1 10.1.3.0/24 C 1 10.1.2.0/24 C 1 10.1.3.0/24 C 1 10.1.6.0/24 C 1 10.1.3.0/24 10.1.1.2 2 10.1.4.0/24 C 1 10.1.1.0/24 10.1.3.1 2 10.1.4.0/24 10.1.1.2 2 10.1.5.0/24 C 1 10.1.4.0/24 10.1.3.1 2 10.1.5.0/24 10.1.1.2 2 10.1.2.0/24 10.1.1.1 2 10.1.5.0/24 10.1.3.1 2 10.1.6.0/24 10.1.3.2 2 10.1.2.0/24 10.1.3.1 3 R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.2.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.7.0/24 C 1 10.1.7.0/24 C 1 10.1.6.0/24 C 1 10.1.1.0/24 10.1.2.1 2 10.1.8.0/24 C 1 10.1.8.0/24 C 1 10.1.1.0/24 10.1.4.1 2 10.1.1.0/24 10.1.5.1 2 10.1.3.0/24 10.1.4.1 2 10.1.3.0/24 10.1.5.1 2 10.1.5.0/24 10.1.4.1 2 10.1.4.0/24 10.1.5.1 2 10.1.2.0/24 10.1.4.1 3 10.1.2.0/24 10.1.5.1 3 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

  13. RIP Example Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.1.0/24 C 1 10.1.1.0/24 C 1 10.1.3.0/24 C 1 10.1.2.0/24 C 1 10.1.3.0/24 C 1 10.1.6.0/24 C 1 10.1.3.0/24 10.1.1.2 2 10.1.4.0/24 C 1 10.1.1.0/24 10.1.3.1 2 10.1.4.0/24 10.1.1.2 2 10.1.5.0/24 C 1 10.1.4.0/24 10.1.3.1 2 10.1.5.0/24 10.1.1.2 2 10.1.2.0/24 10.1.1.1 2 10.1.5.0/24 10.1.3.1 2 10.1.7.0/24 10.1.2.2 2 10.1.6.0/24 10.1.3.2 2 10.1.2.0/24 10.1.3.1 3 R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.2.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.7.0/24 C 1 10.1.7.0/24 C 1 10.1.6.0/24 C 1 10.1.1.0/24 10.1.2.1 2 10.1.8.0/24 C 1 10.1.8.0/24 C 1 10.1.1.0/24 10.1.4.1 2 10.1.1.0/24 10.1.5.1 2 10.1.3.0/24 10.1.4.1 2 10.1.3.0/24 10.1.5.1 2 10.1.5.0/24 10.1.4.1 2 10.1.4.0/24 10.1.5.1 2 10.1.2.0/24 10.1.7.1 2 10.1.2.0/24 10.1.5.1 3 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

  14. RIP Example Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.1.0/24 C 1 10.1.1.0/24 C 1 10.1.3.0/24 C 1 10.1.2.0/24 C 1 10.1.3.0/24 C 1 10.1.6.0/24 C 1 10.1.3.0/24 10.1.1.2 2 10.1.4.0/24 C 1 10.1.1.0/24 10.1.3.1 2 10.1.4.0/24 10.1.1.2 2 10.1.5.0/24 C 1 10.1.4.0/24 10.1.3.1 2 10.1.5.0/24 10.1.1.2 2 10.1.2.0/24 10.1.1.1 2 10.1.5.0/24 10.1.3.1 2 10.1.7.0/24 10.1.2.2 2 10.1.6.0/24 10.1.3.2 2 10.1.2.0/24 10.1.3.1 3 10.1.7.0/24 10.1.4.2 2 10.1.8.0/24 10.1.4.2 2 R1 R2 R3 10.1.1.0/24 10.1.3.0/24 10.1.1.1 10.1.1.2 10.1.3.1 10.1.3.2 10.1.2.1 10.1.4.1 10.1.6.1 10.1.5.1 10.1.2.0/24 10.1.4.0/24 10.1.6.0/24 10.1.5.0/24 10.1.2.2 10.1.4.2 10.1.6.2 10.1.5.2 10.1.7.0/24 10.1.8.0/24 10.1.7.1 10.1.7.2 10.1.8.1 10.1.8.2 R4 R5 R6 Destination Gateway Cost Destination Gateway Cost Destination Gateway Cost 10.1.2.0/24 C 1 10.1.4.0/24 C 1 10.1.5.0/24 C 1 10.1.7.0/24 C 1 10.1.7.0/24 C 1 10.1.6.0/24 C 1 10.1.1.0/24 10.1.2.1 2 10.1.8.0/24 C 1 10.1.8.0/24 C 1 10.1.4.0/24 10.1.7.2 2 10.1.1.0/24 10.1.4.1 2 10.1.1.0/24 10.1.5.1 2 10.1.8.0/24 10.1.7.2 2 10.1.3.0/24 10.1.4.1 2 10.1.3.0/24 10.1.5.1 2 10.1.3.0/24 10.1.7.2 3 10.1.5.0/24 10.1.4.1 2 10.1.4.0/24 10.1.5.1 2 10.1.5.0/24 10.1.7.2 3 10.1.2.0/24 10.1.7.1 2 10.1.2.0/24 10.1.5.1 3 10.1.7.0/24 10.1.8.1 2 Dr. Miled M. Tezeghdanti () Internet Routing May 8, 2012 8 / 71

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