COMPUTER NETWORKS CS610 Lecture-42 Hammad Khalid Khan.

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Presentation transcript:

COMPUTER NETWORKS CS610 Lecture-42 Hammad Khalid Khan

Review Lecture 41 Routes and Data Traffic Borger Gateway Protocol (BGP) Routing Information Protocol (RIP)

RIP Packet Format

Illustration of RIP Packet Format

The Open Shortest Path

OSPF Characteristics Routing Within An Autonomous System Full CIDR and Subnet Support Authenticated Message Exchange Imported Routes Link-State Algorithm Support For Multi-access Networks

OSPF AREAS

Multicast Routing

Link-Status in the Internet Router corresponds to node in graph Network corresponds to edge Adjacent pair of routers periodically Test connectivity Broadcast link-status information to area Each router uses link-status messages to compute shortest paths

Illustration of OSPF Graph

OSPF and Scale Because it allows a manager to partition the routers and networks in an autonomous system into multiple areas, OSPF can scale to handle a much larger number of routers than other IGPs

Summary RIP Packet Format Open Shortest Path First (OSPF) Protocol OSPF Graph OSPF Areas