Today we will talk about a single command related to the Open Shortest Path First “OSPF” which is “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 adjacency over a link.
Command is per interface:
|Router(config-if)#ip ospf network point-to-point|
– We have two routers “R1 & R2” connected in a network through their S1/1 interfaces.
First, we’ll configure OSPF on R1 and R3 for their S1/1 interfaces
|R1(config-router)#router ospf 1
R1(config-router)#network 0.0.0.0 0.0.0.0 area 0
Next, we’ll configure the serial link to use point-to-point network type.
R1(config-if)#ip ospf network point-to-point
Then we check the network type by typing: show ip ospf interface s1/1.
|Serial1/1 is up, line protocol is up
Internet Address 188.8.131.52/30, Area 0
Process ID 1, Router ID 184.108.40.206, Network Type POINT_TO_POINT, Cost: 64
Transmit Delay is 1 sec, State POINT_TO_POINT,
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
oob-resync timeout 40
Hello due in 00:00:02
Supports Link-local Signaling (LLS)
Index 3/3, flood queue length 0
Last flood scan length is 1, maximum is 1
Last flood scan time is 4 msec, maximum is 4 msec
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 10.10.10.10
Suppress hello for 0 neighbor(s)
After we configure the network-area statement, the adjacency comes up.
Notice there is no DR information in the show ip ospf neighbor output. This is because the network type doesn’t support election
|R1#show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
10.10.10.10 0 FULL/ – 00:00:30 220.127.116.11 Serial1/1
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