OSPF adjacency fail on NBMA network using point-to-multipoint Frame Relay

Routing & Switching OSPF
1

I tried to configure OSPF on an NBMA network using a point-to-multipoint Frame Relay, as below:

Configuration on R1:

!
interface Serial1/0
 ip address 192.168.123.1 255.255.255.0
 encapsulation frame-relay
 ip ospf network non-broadcast
 serial restart-delay 0
 clock rate 2016000
 frame-relay map ip 192.168.123.2 102 broadcast
 frame-relay map ip 192.168.123.3 103 broadcast
!

!
router ospf 1
 network 192.168.123.0 0.0.0.255 area 1
 neighbor 192.168.123.3
 neighbor 192.168.123.2
!

Configuration on R2:

!
interface Serial1/0
 ip address 192.168.123.2 255.255.255.0
 encapsulation frame-relay
 ip ospf network non-broadcast
 ip ospf priority 0
 serial restart-delay 0
 clock rate 2016000
 frame-relay map ip 192.168.123.1 201 broadcast
!
!
router ospf 1
 network 192.168.123.0 0.0.0.255 area 1
!

Configuration on R3:

!
interface Serial1/0
 ip address 192.168.123.3 255.255.255.0
 encapsulation frame-relay
 ip ospf network non-broadcast
 ip ospf priority 0
 serial restart-delay 0
 clock rate 2016000
 frame-relay map ip 192.168.123.1 301 broadcast
!
!
router ospf 1
 network 192.168.123.0 0.0.0.255 area 1
!

But when I check the neighbors on R2 and R3, I don’t see a neighbor establised, and in R1 I see the below:

R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
N/A               0   ATTEMPT/DROTHER    -        192.168.123.3   Serial1/0
N/A               0   ATTEMPT/DROTHER    -        192.168.123.2   Serial1/0

What exactly am I missing ?

2

Think this is what happens:
* statically defining a neighbour only on one side would result in that side sending a unicast hello to the defined neighbour.
* The sending neighbour would go to the ATTEMPT state (so far so good)
* The receiving neighbour would go to the INIT state upon receving the hello (so far so good)
* At this point the receiving neighbour does not respond.

So what you are seeing in the neighbour states matches exactly with the receiving neighbour not responding to a unicast hello.

So first try to look at the unicast paths and make sure that all works

3

Hi Maikel,

I’m new to Frame Relay setups. Can you please be specific, on what are the points I need to check here on my setup ? What do you exactly mean when you say to check the unicast paths ?

4

See if you can ping all the network interfaces from each router