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Spirent TestCenter: What could be the reason the OSPF router won't come UP and got stuck on Loading / DRother

Objective/Summary
What could be the reason the OSPF router won't come UP and got stuck on Loading / DRother
 
Environment/Versions
  • OSPF Configuration
  • OSPFv2
Procedure
Sometimes could be a DUT issue/ limitation:
  1. Like the LSA update larger than the DUT can handle, try  lowering the number of LSA’s and validate whether if the neighbor goes full or not. 
Or some missconfirutaion:
  1. Misconfigured or mismatched mask
  2. Mismatched Area ID
  3. Mismatched Hello Interval & Router Dead Interval timers
  4. Mismatched MTU
  5. Mismatched authentication
  6. Interface on Vlan or not
  7. Mismatched network type

Product : Spirent TestCenter