OSPF: Intradomain Routing Protocol
OSPF (Open Shortest Path First) is an intradomain routing protocol based on the link-state routing protocol. It calculates the metric cost of reaching a destination from the host by assigning weights to links based on factors like throughput, round-trip time, and reliability. OSPF uses forwarding tables, link-state advertisements, five types of link-state advertisements, OSPF messages, and implements the link-state routing algorithm with augmentations to handle message exchange.
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Presentation Transcript
OSPF Open Shortest Path First (OSPF) is also an intradomain routing protocol it is based on the link-state routing protocol
Metric Cost of reaching a destination from the host is calculated from the source router to the destination network. Each link (network) can be assigned a weight based on the throughput, round-trip time, reliability
Five types of link-state advertisements: router link, network link, summary link to network summary link to AS border router external link.
OSPF Algorithm OSPF implements the link-state routing algorithm we discussed in the previous section. However, some changes and augmentations need to be added to the algorithm: After each router has created the shortest-path tree, the algorithm needs to use it to create the corresponding routing algorithm. The algorithm needs to be augmented to handle sending and receiving all five types of messages.
