OSPF DR and BDR election

Objectives

The simulator ticks each one as soon as the network meets it.

1. Check the neighbor table: which router is DR and which is BDR?
2. Make R1 the DR (priority 255).
3. Make R2 the BDR (priority 200).
4. Stop R4 from ever becoming DR or BDR (priority 0).
5. From R1, confirm R2 is shown as BDR.