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Running Normal/Extended diagnostic in x440 series switches are failed with error message “Test loopback phy fiber" and "Test snake interface"

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TitleRunning Normal/Extended diagnostic in x440 series switches are failed with error message “Test loopback phy fiber" and "Test snake interface"
Symptoms
 
  • While running Normal/Extended diagnostic in SummitX440 series switches are failed with error message “Test loopback phy fiber" and "Test snake interface".

X440-24t-10G.2 # run diagnostics extended
Running Diagnostics will disrupt network traffic.
Are you sure you want to continue? (Y/N) Yes
 
Sending SIGKILL to all processes
Requesting system reboot
Initializing operational diagnostics...
Running Power on Self-Test...(Extended mode)
 
Test i2cenviron                   - PASS
Test nvram                        - PASS
Test internal flash               - PASS
Test sdram                        - PASS
Test loopback eth                 - PASS
Test loopback pci                 - PASS
Test loopback mac interface       - PASS
Test loopback phy copper          - PASS
Test loopback phy fiber           - FAIL     ====> FAILED
Test snake interface              - FAIL       ====> FAILED     
                           
Test asic0 reg                    - PASS
Test asic0 mac                    - PASS
Storing diagnostics result into EEPROM.
Diagnostics completed.
Waiting for reboot...Restarting system.
 
X440-24t-10G.1 # show diagnostics
Last Test Date: Oct-29-2015   Loopback Phy Fiber: Run Test Failure on unit - [0], port-[25]
Snake Loopback: Closing Connections Failure on unit - [0], port-[25]

Last Test Version:        6.3
Summary: Diagnostics Fail

  • Observed issue in EXOS 15.5.4.2-patch1-5 and not seen in EXOS 15.3.4.6-patch1-14.
Environment
  • SummitX440-24t-10G
  • SummitX440-48t-10G
  • Summit X440-24p-10G
  • Summit X440-48p-10G
  • EXOS 15.5.4.2-patch1-5
Cause
Resolution
  • This is a software issue and there is no hardware functionality issue. Hence, do not RMA the device.
  • ​We are working on providing a solution to integrate into EXOS.
  • Please use the CR# xos0064050 to track this issue. ​("xos0064050 - Diagnostics fail for snake/loopback test on X440 with test version 6.0 or above")
  • As of now, we have added a target for EXOS 16.2, 21.1.2 and 21.2 version. When the target date is confirmed, we will add appropriate older targets as well.
  • For more information, please contact GTAC.
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