For previous post about Neighbourship formation....Click here neighbour-formation-stages-in-ospf
àIn a network all the
router will sends route updates to all other routers, so that the burden is very high
on the network due to the routing updates traffic.
To solve this DR and BDR is introduced. So that all the routers
will send route updates to these DR and BDR only
Ø To reduce the FULL
Neighbourships.
Ø To reduce the CPU burden
on devices.
Ø To reduce the Bandwidth
utilization.
So that all routers will make FULL Neighbourship with DR, while the
other router will make up to 2-Way state
neghbourship only.