OSPF introduction

access_time 2019-05-17T18:03:54.031Z face atul

OSPF: Open Shortest path first.

> Link state protocol
> Unlimited routers
> Open standard ( Mostly used IGP )
> Multicast : 224.0.0.5 and 224.0.0.6
> SPF algorithm - Dijkstra 
> Administrative value : 110 
> IP protocol : 89

Hello - 10 secs
Dead time - 40 secs

Types of Table : 

> Neighbor table - Directly connected neighbors
> Database table - List of all the networks
> Routing table - Best paths

> OSPF has a concept of Areas.
> To stop Flooding of OSPF Packets.
> OSPF network should have Area 0.
> All the areas should connect to Area 0.
> Area 0 is also known as Backbone area.
> Router participates in multi-area is known as ABR.
> ABR Stands for Area Border Router.

ARea 1 -------  Area 0------- ARea 2

Types of packets
1. Hello - To discover the neighbors..
2. DBD - Database description
3. LSR - Link state request
4. LSU - Link state update 
5. LsAck - Link state acknowledgment

OSPF states.
1. Down
2. Init
3. 2way
4. Exstart
5. Exchange
6. Loading 
7. Full

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