IP OSPF Network Point to Point on Frame Relay

jskfan
jskfan used Ask the Experts™
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IP OSPF Network Point to Point on Frame Relay

os
I have configured IP OSPF Network Point to Point on R1,R2,R3 serial0 Interfaces.

however from R1 , I do not see both neighbors together, it keeps showing sometimes the 2.2.2.2 which is R2 and sometimes 3.3.3.3 which is R3
I am not sure why it is doing this flapping.

Any help will be very appreciated

Thank you

R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
3.3.3.3           0   FULL/  -        00:00:38    123.0.0.3       Serial0/0
R1#

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R1#sh ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           0   FULL/  -        00:00:38    123.0.0.2       Serial0/0

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I wonder if the reason that neighborship is flapping because all 3 routers are in the same subnet, and Point to point requires that they need to be in separate subnets ?
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Distinguished Expert 2018
Commented:
Point-to-point accepts only two host no more (at least only 2 OSPF neigbors). Each two hosts pair need to be in separate broadcast domain (typically subinterfaces are configured).

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Commented:
That's what I thought too..

Thank you

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