SFP Transceiver Diagnostic Information Shows Rx Power 0.00 mW When Interface is Up and Active

• After SFP transceiver is plugged to an interface and the interface is up and active, show transceiver <interface-name> shows Rx Power as 0.00 mW

  > show transceiver ethernet1/14
  
  --------------------------------------------------------------------------------
           Port   Temperature      Voltage      Current    Tx Power    Rx Power
  --------------------------------------------------------------------------------
   ethernet1/14       36.99 C       3.29 V      5.83 mA     0.63 mW     0.00 mW

• The Rx Power is then updated without any action.

  > show transceiver ethernet1/14
  
  --------------------------------------------------------------------------------
           Port   Temperature      Voltage      Current    Tx Power    Rx Power
  --------------------------------------------------------------------------------
   ethernet1/14       37.94 C       3.28 V      6.23 mA     0.65 mW     0.62 mW

• Palo Alto hardware Firewalls
• Supported PAN-OS
• SFP transceiver module

• The default diagnostic monitor interval is 3,600 seconds (i.e 1 hour).
• When the interface is first plugged in or after a link down/up event, it takes an hour for the diagnostic monitor to run and display the power.

1. Set the diagnostic data with shorter delay (less than 3600 seconds)
2. The diagnostic monitor interval to 10 seconds in the example below

> set transceiver-monitor-rate seconds 10

A similar issue is reported and tracked under PAN-330561 where RX power shows 0.00 mW on the up and active interface, with no traffic impact.

• Impacted version: PAN-OS 11.1.13 on PA-52xx series.
• Resolved in PanOS 14.1.0.
• Fix for PanOS 11.1.x and 11.2.x versions are in development.