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Brocade adapters reporting I2C errors after switch reboot

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brocade
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Applies to

  • Brocade X7 Director Switch
  • Fabric OS (FOS) 9.2.2c
  • Brocade SFPs with JAAC Serial numbers

Issue

  • The control processor (CP) fails over, and many SFPs report an I2C clock/data line error.
    • 2026/09/15-06:00(EDT), [BL-1090], 574, SLOT 2 | CHASSIS | PORT 3/18, ERROR, Fabric-B, The optical module in the slot 3 port 18 encountered an I2C clock/data line error. Replace the optic if the problem persists.
  • sfpshow on an affected port returns Media not installed.
  • Ports that were reseated earlier return to error after the CP fails over, and more ports are affected.

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