ospf-4----Page:5
1  2  3  4  5  6  7  8  9 

The Hello Process
Replace the state with a state sequence
A small (32 bit) number
Indicates “current hello state”
Each time the sender changes state
Include new information
Increment the state sequence
Receiver can request a state update to synchronize
Reduces the state carried in hellos to the minimum possible, while ensuring two way connectivity
A
PPT Version