OSPF: Difference between revisions
→Troubleshooting
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*On a shared/ethernet network, only 2 router, DR & BDR will form full relationship, all others will stay in 2-way state.<ref>www.wipro.com</ref>
*If OSPF is stuck in ExStart State, MTU mismatch may be the cause, as it is requirement to successfully pass DBD Packets. Matching MTU is not a Adjacency Requirement, but is required to successfully pass Database Descriptor Packets
*In OSPF, MTU Mismatch causes neighbors swinging between ExStart state to Down state
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