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Chapter 5 – TCP/IP: Routing – Part 2

Chapter 5 – TCP/IP: Routing – Part 2. Dr. V.T. Raja Oregon State University. TCP/IP – Routing - Part 2. Outline Routing Protocols Unicast messages Broadcast messages Routing Tables. Routing Protocols Autonomous System of Networks.

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Chapter 5 – TCP/IP: Routing – Part 2

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  1. Chapter 5 – TCP/IP: Routing – Part 2 Dr. V.T. Raja Oregon State University

  2. TCP/IP – Routing - Part 2 Outline • Routing Protocols • Unicast messages • Broadcast messages • Routing Tables

  3. Routing ProtocolsAutonomous System of Networks • Each large organizational network connected to Internet (e.g., AT&T, IBM, OSU) can be viewed as a separate autonomous system • Computers within each autonomous system usually exchange routing information among themselves • Routing protocols used inside an autonomous system are called interior routing protocols • Routing protocols used between autonomous systems are called exterior routing protocols

  4. Routing Protocols • Internet Control Message Protocol (ICMP) • Error advisement • Example: Ping command – Host (Destination) unreachable • Flow control • Requesting a device to reduce the rate at which it transmits

  5. Routing Protocols • Routing Information Protocol (RIP) • Dynamic distance vector routing protocol • Scalability: 15-hop limit • Good for smaller networks • Broadcast interruptions (entire routing table transmitted very often) • Slower convergence – Takes a longer time for routing tables to be transmitted very often

  6. Routing Protocols • Open Shortest Path First (OSPF) • Link State Dynamic Routing Protocol • Faster convergence • Designated router updated on changes in route status • Border Gateway Protocol (BGP) • Distance Vector Dynamic Routing Protocol • Used between autonomous systems • Changes in route status info transmitted

  7. Comparison of Routing Protocols

  8. TCP/IP and Routing • TCP/IP can use RIP, ICMP, OSPF, BGP • It is compatible with distance vector and link state protocols • Can operate either as connectionless or connection oriented routing • Can support QoS routing (a new version of OSPF called QOSPF)

  9. Unicast Most common type of message transmitted (from one sender to one final destination) Example: Broadcast Subnet broadcast Example LAN broadcast Example Unicast/Broadcast

  10. DestinationRoute A A C C D A E E F E G C Default A Routing TablesRouting Table for B

  11. Routing Table(Continued)

  12. IntroductionRouter Forwarding Table

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