IP OSPF Network point-to-point
This command manually sets the OSPF network type to point-to-point. This is the default for serial links. The point-to-point network type does not have a DR election.
Note: Point-to-point can only have a single adjaceny over a link.
Router(config-if)#ip ospf network point-to-point
In this example, we will configure R1’s S1/1 to R3 to use its default network type
First, we’ll configure OSPF on R1 and R3 for their S1/1 interfaces
R1(config-router)#router ospf 1
Next, we’ll configure the serial link to use point-to-point.
Checking show ip ospf interface s1/1 we see the network type is point to piont
Serial1/1 is up, line protocol is up
After we configure the neighbor statement, the adjacencies come up.
Notice there is no DR information in the show ip ospf neighbor output. This is because the network type doesn’t support elections
R1(config-if)#do show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface