Cisco Catalyst 9500 Manual page 209

Configuring Online Diagnostics
DiagFanTest
This test verifies if all the fan modules that have been inserted are working properly on the board.
Attribute
Disruptive or Nondisruptive
Recommendation
Default
Intitial release
Corrective action
Hardware support
DiagPhyLoopbackTest
This PHY loopback test verifies the PHY-level loopback functionality. In this test, a packet, which loops back
at the PHY level and is matched against the stored packet, is sent. It cannot be run as a health-monitoring test.
Note
In certain cases when this test is run on-demand, ports are moved to the error-disabled state. In such cases,
use the shut and no shut command in interface configuration mode to reenable these ports.
Attribute
Disruptive or Nondisruptive
Recommendation
Default
Intitial release
Corrective action
Hardware support
DiagScratchRegisterTest
This Scratch Register test monitors the health of ASICs by writing values into registers and reading back the
values from these registers.
Attribute
Disruptive or Nondisruptive
System Management Configuration Guide, Cisco IOS XE Amsterdam 17.2.x (Catalyst 9500 Switches)
Generic Online Diagnostics (GOLD) Tests
Description
Nondisruptive
Run this as a health-monitoring test if you experience
a problem with the fan module.
On.
Cisco IOS XE Everest 16.6.1.
–
Supervisors.
Description
Disruptive.
If the link to the external connector is down, run this
on-demand test to check the health of the link.
Off.
Cisco IOS XE Everest 16.6.1.
–
Supervisors and linecards.
Description
Nondisruptive.
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