1) Stuck in INIT state:
--> Because of ACL is blocking OSPF ( Protocol Number 89).
--> On one router OSPF is enabled and other router is not having OSPF enabled.
2) Stuck in Exstart/ Exchange state:
--> Because of ACL is blocking OSPF ( Protocol Number 89).
--> On one router OSPF is enabled and other router is not having OSPF enabled.
2) Stuck in Exstart/ Exchange state:
--> Duplicate Router-ID
--> Mismatched MTU
3) Stuck in Two-Way State:
--> All the routers are configured with OSPF priority 0.
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