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Cisco Bug: CSCvt44961 - After ugprade some ports do not come up

Last Modified

Oct 13, 2020

Products (24)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 93240YC-FX2 Switch
  • Cisco Nexus 9332C Switch
  • Cisco Nexus 93108TC-EX Switch
  • Cisco Nexus 9372TX-E Switch
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Known Affected Releases


Description (partial)

After an upgrade some ports may not come up.

You can validate the defect by checking the port logs and see if there are any failed read errors using following command:

vsh_lc -c "show platform internal tah event-history trace" | grep "mdio rd failed" 

Example Broken state:
247) Event:E_DEBUG, length:97, at 2020-07-31T13:38:38.580847000-05:00
[808595506] tahusd_mifpga_mdio_reg_read/247: mdio rd failed inst: 8, port: 0, dev: 0x1e, offset: 0x400d

This issue can be seen after upgrading or after some port flaps.
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