OSPF adjacency steps

[kamlesh.sharma]

Hi friends,

According to attached documentation.

I was thinking that in exstart state DDP coming from Chardonnay should have M bit value 0 because shiraz has highest ip and Chardonnay has lower. SO shiraz will become Master for this DDP exchange.

Please help.

Kamlesh Sharma

[amit-singh]

Yes, Kamlesh. You are right..

Shiraz will be the master as it has highest IP address.

There are 4 steps in adjacency formation :

1. Neighbor relationship

2. Bi-directional relationship i.e 2way

3. Exchange of DD packets

4. Full adjacnecy ( Full state)

In this case after the 2-way state Shiraz will become the master as it has the highest IP and when it will send the first DD packet it will set the Initial Bit (I=1) Morebit ( M=1) and Masterslave bit(MS=1) and will get the reply from Chardonnay with MS bit set to 0 as it is the slave.

HTH,

-amit singh