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How many hello packets get exchanged between routers in ospf to go from DOWN state to 2-way state? ONLY From Down to 2-way. It will be very helpful if you could explain full procedure packet by packet from down state?

Take any two routers connected by FastEthernet 0/0 and 10.1.1.0/32 ?

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Three.

Router A sends a hello to router B.   Router B lists A as Init
Router B sends a hello to A, listing A as its neighbor.  Router A lists B as 2-way
Router A sends a hello to B listing B as its neighbor.  Router B lists A as 2-way
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  • Listing A and B as each other neighbor;okk; In which filed of hello packet does these neighbor located i.e. field in hello packet where B list A as its neighbor and vice versa. – Shivam Chauhan Jul 13 '15 at 5:21
  • Ten seconds with Google will give you that answer. – Ron Trunk Jul 13 '15 at 20:49

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