Performing Switch Diagnostics

The switch provides a facility for running normal or extended diagnostics.

In simple terms, a normal routine performs a simple ASIC and packet loopback test on all ports, and an extended routine performs extensive ASIC, ASIC-memory, and packet loopback tests. By running and viewing the results from diagnostic tests, you can detect and troubleshoot any hardware issues.

On BlackDiamond X8 and 8800 series switches, you can run the diagnostic routine on Input/Output (I/O) modules, management modules (MSMs/MMs), or Fabric modules (BlackDiamond X8 series only) without affecting the operation of the rest of the modules. The module under test is taken offline while the diagnostic test is performed. Traffic to and from the ports on that module is temporarily unavailable. When the diagnostic test is complete, the module is reset and becomes operational again.

On Summit family switches, you run the diagnostic routine on the switch or on the stacking ports. Running the switch or stacking port diagnostic routine affects system operation; the switch is unavailable during the diagnostic test.


The diagnostics image is not included in the SummitX480 image. You must use the diagnostics.xmod to update the diagnostics image.


Before running diagnostics, you must power on the External Power Supply (EPS) when it is connected to the switch.
When you run diagnostics on an I/O module, MSM/MM module, Fabric module (BlackDiamond X8 series only), or a Summit family switch, the switch verifies that the:
  • Registers can be written to and read from correctly.
  • Memory addresses are accessed correctly.
  • Application-Specific Integrated Circuit (ASICs) and Central Processing Unit (CPUs) operate as required.
  • Data and control fabric connectivity is active (modular switches only).
  • External ports can send and receive packets.
  • Sensors, hardware controllers, and LEDs are working correctly.


Before running slot diagnostics on a modular switch, you must have at least one MSM/MM installed in the chassis.

When you run diagnostics on the SummitStack stacking ports, the switch completes a hardware test to ensure that the stacking ports are operational.