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*In OSPF, MTU Mismatch causes neighbors swinging between ExStart state to Down state
Mar 1 00:10:09.535: %OSPF-5-ADJCHG: Process 1, Nbr 10.10.10.1 on Ethernet0/0 from EXSTART to DOWN, Neighbor Down: Too many retransmissions
*Can we use OSPF without area 0?
There is only one way to use OSPF without an Area 0, and that is to use OSPF with a single area.
If you only have one OSPF area, you can number it any way you like, but if you have even two areas, you must have an Area 0.
== Basic OSPF Lab ==
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