[c-nsp] Newbish OSPF DR question on VLANs

[Hank Nussbacher]

What causes a router to become a Designated Router (DR) on a VLAN?  I 
always thought highest router-id, but I have a few test routers and here is 
what I get:

C#sho ip ospf nei

Neighbor ID     Pri   State           Dead Time   Address         Interface
192.168.1.1       1   FULL/DR         00:00:37    10.1.3.1        Vlan50
192.168.1.3       1   FULL/DR         00:00:38    10.3.3.1        Vlan40
192.168.1.2       1   FULL/DR         00:00:30    10.2.2.2        Vlan30
C#sho ip ospf neigh 192.168.1.1 ?
C#sho ip ospf neigh 192.168.1.1 deta
  Neighbor 192.168.1.1, interface address 10.1.3.1
     In the area 0 via interface Vlan50
     Neighbor priority is 1, State is FULL, 6 state changes
     DR is 10.1.3.1 BDR is 10.1.3.2
     Options is 0x52
     LLS Options is 0x1 (LR)
     Dead timer due in 00:00:34
     Neighbor is up for 00:27:35
     Index 1/1, retransmission queue length 0, number of retransmission 1
     First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
     Last retransmission scan length is 1, maximum is 1
     Last retransmission scan time is 0 msec, maximum is 0 msec
C#sho ip ospf neigh 192.168.1.2 deta
  Neighbor 192.168.1.2, interface address 10.2.2.2
     In the area 0 via interface Vlan30
     Neighbor priority is 1, State is FULL, 6 state changes
     DR is 10.2.2.2 BDR is 10.2.2.1
     Options is 0x52
     LLS Options is 0x1 (LR)
     Dead timer due in 00:00:31
     Neighbor is up for 00:27:49
     Index 3/3, retransmission queue length 0, number of retransmission 0
     First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
     Last retransmission scan length is 0, maximum is 0
     Last retransmission scan time is 0 msec, maximum is 0 msec
C#sho ip ospf neigh 192.168.1.3 deta
  Neighbor 192.168.1.3, interface address 10.3.3.1
     In the area 0 via interface Vlan40
     Neighbor priority is 1, State is FULL, 6 state changes
     DR is 10.3.3.1 BDR is 10.3.3.2
     Options is 0x52
     LLS Options is 0x1 (LR)
     Dead timer due in 00:00:37
     Neighbor is up for 00:28:02
     Index 2/2, retransmission queue length 0, number of retransmission 1
     First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
     Last retransmission scan length is 1, maximum is 1
     Last retransmission scan time is 0 msec, maximum is 0 msec

IOS 12.3(11)T2 if it makes a difference.

All four of them become DR.  I have attached a png file that I hope makes 
it thru the Mailman filter.

Thanks,
-Hank