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Cisco Bug: CSCvh79981 - Pyke : Interface link is down on specific ports on when using QSFP-100G-CWDM4-S

Last Modified

Oct 20, 2019

Products (1)

  • Cisco Network Convergence System 5500 Series

Known Affected Releases


Description (partial)

Interface will be down when connected back to back with QSFP-100G-CWDM4-S optics in NCS-55A1-24H system 

show controller hundredGigE R/S/I/P CLI o/p will show FEC is disabled for one interface and Enabled for other interface.

CLI o/p snippet for FEC enabled:
  Forward error correction: Standard (Reed-Solomon)

CLI o/p snippet for FEC disabled:
   Forward error correction: Disabled

No FEC configuration under the interface for both ports.
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