Open Shortest Path First (OSPF) Summary

Hi All,

Here is the list of summary for OSPF. I will add every topic details in upcoming blogs.

What is OSPF ?

– OSPF is Open Standard Interior Gateway Protocol (IGP)

– Link State Routing Protocol

– Uses Dijkstra SPF Algorithm

– Supports VLSM And Summarisation

– works on IP port 89.

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OSPF Adjacency State Machine

Hi All,

The Hello Protocol is responsible for neighbour acquisition, maintenance and for ensuring two way communication between neighbours.

In other words, Hello packets are used to form neighbour/adjacency relationship on OSPF enabled links.

There are 8 STATE process to establish adjacency.

Down

Attempt

Init

2-Way

Exstart

Exchange

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Full

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