This article explains why the event message SFP receive power high warning set might appear in the syslog.

When a high power condition is detected on an SFP, a message similar to the following appears in the syslog:

chassism[1344]: %DAEMON-5: link 0/1/0 SFP receive power high warning cleared

chassism[1344]: %DAEMON-5: link 0/1/0 SFP receive power high warning set

• The bus that the router uses to monitor the SFP and update diagnostic data is called "i2c" or IIC, for inter-integrated circuit. Conditions sometimes arise that cause the i2c to miss updates. As a result, you might see warnings and alarms regarding high power that subsequently clear. These should not affect traffic in any way. 
• This issue is seen more often when non-Juniper/unsupported SFPs are used, because different SFP makers handle SFP monitoring in different ways. As long as you are not seeing a traffic impact along with the power warning, the message is safe to ignore.
• If you are seeing a traffic impact, then the message could indicate a hardware problem with the SFP, the PIC into which it is installed, the FPC, or the fibre that is plugged into the SFP.

Collect show command output.

Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.

1. show log messages
2. show interfaces extensive
3. show interfaces diagnostics optics <interface>
4. request pfe execute command "show nvram" target fpc0 (replace 0 with relevant fpc from the message)
5. request pfe execute command "show syslog messages" target fpc0 (replace 0 with relevant fpc from the message)

Analyze the show command output 

1. Determine if you are losing any traffic due to the message. Use the show interfaces extensive command to show traffic statistics, including dropped packets. If you use this command over time, you can see if the drops are incrementing.
   1. If you are losing traffic, re-insert or swap out the SFP. If this fails to resolve the issue, try cleaning the fiber (electronically), or test the fiber on another link to verify that there is not a faulty fiber.
   2. If the SFP and cable are confirmed to be fine, you can try swapping the PIC. If this does not resolve the issue, then the FPC that is reporting these messages should be replaced. If there is any doubt, examine the logs in Step 1 for further investigation.
   3. Look for messages that occur at or immediately before the PFE:.*SFP receive power high warning set message. If no traffic loss is occurring with the message, no action is necessary, and the message can be ignored. If there is traffic loss, clean the fiber and perform the hardware swaps indicated in the above section.

If these efforts do not resolve the problem, please open a Jtac case to investigate the issue further.