OSPF Network Type Non-Broadcast

[parthrawat979]

A simple topology of three routers R1, R2 and R3 connected in a multiaccess segmetn.

R1#sh ip os int f0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 123.1.1.1/24, Area 0, Attached via Network Statement
Process ID 1, Router ID 1.1.1.1, Network Type NON_BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 1.1.1.1, Interface address 123.1.1.1
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:17
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
R1#sh ip os ne

Neighbor ID Pri State Dead Time Address Interface
N/A 0 ATTEMPT/DROTHER - 123.1.1.2 FastEthernet0/0
N/A 0 ATTEMPT/DROTHER - 123.1.1.3 FastEthernet0/0

R2#sh ip os int f0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 123.1.1.2/24, Area 0, Attached via Network Statement
Process ID 1, Router ID 2.2.2.2, Network Type NON_BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 2.2.2.2, Interface address 123.1.1.2
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:04
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor count is 0
Suppress hello for 0 neighbor(s)
R2#sh ip os ne

Neighbor ID Pri State Dead Time Address Interface
N/A 0 ATTEMPT/DROTHER - 123.1.1.1 FastEthernet0/0
N/A 0 ATTEMPT/DROTHER - 123.1.1.3 FastEthernet0/0

R3#sh ip os ne

Neighbor ID Pri State Dead Time Address Interface
N/A 0 ATTEMPT/DROTHER - 123.1.1.2 FastEthernet0/0
N/A 0 ATTEMPT/DROTHER - 123.1.1.1 FastEthernet0/0
R3#sh ip os int f0/0
FastEthernet0/0 is up, line protocol is up
Internet Address 123.1.1.3/24, Area 0, Attached via Network Statement
Process ID 1, Router ID 3.3.3.3, Network Type NON_BROADCAST, Cost: 1
Topology-MTID Cost Disabled Shutdown Topology Name
0 1 no no Base
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 3.3.3.3, Interface address 123.1.1.3
No backup designated router on this network
Timer intervals configured, Hello 30, Dead 120, Wait 120, Retransmit 5
oob-resync timeout 120
Hello due in 00:00:29
Supports Link-local Signaling (LLS)
Cisco NSF helper support enabled
IETF NSF helper support enabled
Index 1/1/1, flood queue length 0
Next 0x0(0)/0x0(0)/0x0(0)
Last flood scan length is 0, maximum is 0
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 0, Adjacent neighbor coun

why I am getting this Attempt state on every router I have ran
int f0/0
ip ospf network non-broadcast
and also 
router ospf 1 
neighbor 123.1.1.2
neighbor 123.1.1.3(on R1 and similar on every router)

[balaji.bandi]

When I look at your show output,  all showing DR

how are these all router-connected via a Layer 2 switch? Do you have any diagrams?

Can they ping each other to check? do you have any loopback configured with 1.1.1.1 and 2.2.2.2 so on ?

I will make a simple configuration like yours, but add the following as an addition and test it.

int f0/0

IP OSPF network non-broadcast
 
router ospf 1 

network 123.1.1.0 0.0.0.255 area 0

network 1.1.1.1 0.0.0.0 area 0

neighbor 123.1.1.2
neighbor 123.1.1.3

and test - if you have still issue run debug 

debug ip ospf hello

[parthrawat979]

Yeah they all are connected with a layer 2 switch and yes I have configured loopback on all the routers.

[balaji.bandi]

Can they ping each other to check? 

add additional config i provided and check also provided the debug output and ping output.

[parthrawat979]

No they can't ping each other.

[parthrawat979]

R1#ping 123.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 123.1.1.2, timeout is 2 seconds:
.
*Nov 9 15:43:25.119: OSPF-1 HELLO Fa0/0: Send hello to 123.1.1.3 area 0 from 123.1.1.1
*Nov 9 15:43:25.119: OSPF-1 HELLO Fa0/0: Send hello to 123.1.1.2 area 0 from 123.1.1.1....
Success rate is 0 percent (0/5)
No response from the neighbors.

[Joseph W. Doherty]

why I am getting this Attempt state on every router I have ran

Why are you configuring ip ospf network non-broadcast on a multi-access segment?

[M02@rt37]

Hello @parthrawat979 

Because you configure the interface as OSPF non-broadcast, so it disable multicast hellos. Each router keeps trying to reach its manually configured neighbors but never receives a hello back, so adjacencies never form.

Fix it by remove the non-broadcast setting and use the correct network type... mean broadcast, the default behavior.

[parthrawat979]

What kind of solution is this?? I want to be it a non-broadcast.