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OSPF Adjacency Failed but there is physical link

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TitleOSPF Adjacency Failed but there is physical link
Symptoms
  • OSPF adjacency failedHello packets sent on both sides but no TX logged in debug
  • neither side sees a LLDP neighbor
  • Physical Interfaces are up on both sides
  • no physical layer errors on either port
  • disabled and enabled port with no effect
  • deleted and reconfigured interface with no effect
  • ping works through an alternate path so OSPF process running
Environment
  • S-Series
  • OSPF
Cause
Port counters show tx and RX incrementing on one side but only TX incrementing on the other side therefore no frames being received on the port on that side - poorly seated sfp
Resolution
Reseat SFP  
Additional notes
The following article describes how to debug the OSPF adjacency 
How To Debug OSPF Adjacency?

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