SFP Temperature is 255C after Router OS upgrade

RouterOS General
1

Hi, I have 2 SFP modules in 2 different routers. After ugprading both routers to Router OS 7.10 the temperature on both modules which are in different routers is now reported as 255 degrees C. At first it shutdown both interfaces, so I updated the shutdown temperature to 256C. However I still recieve the following warning in the logs every 5 minutes. It worked on a previous Router OS version (I’m not sure what I upgraded from).

“sfp-sfpplus2 high temperature warning! Please, improve module cooling/placement or use different type of modules for this solution”

Has anyone else experienced this? Is there a way to prevent the warning, or any other option/setting that I’m not aware of that will make it work again with these sfp modules?

Other SFP modules work, but this particular brand/cable has stopped working after this upgrade. The part number is “SFP-1G-DAC0.5M”

Thanks

2

Yes. Yours and submit a support request with Mikrotk.

http://forum.mikrotik.com/t/7-10-stable-dns-crash/167135/42

3

Same issue here !!
downgrade to 7.06 to keep DAC twinax Cable (FS.com Generic) works again …

since version 7.06 the pblm doesn’t seem to be fixed in stable versions.
Can you check the Temperature data part? and fix the pblm because the ports are disabled and make the switch inoperable (CRS312).

4

Thank you

5

Are there any possibilities to switch off the monitoring of a sfp+ module’s temperature completely?
I have 4 DAC which are shown as 255C. When I use them the switch fans are running on full speed.

6

if you have the posibility try 7.11rc on lab environment to see if this situation persist

if the problem is present on 7.11rc

please publish it on its related topic

http://forum.mikrotik.com/t/v7-11rc-is-released/168431/1

7

yes, I tried the rc already, bug persists.

8

Same issue here, just updated to 7.11rc
255C on the SFP and the temp.
Of course wrong that thing would be melted.

9

Why is this marked as solved if it’s still an unsolved bug?

10

If you don’t have fans in your device you don’t hear them running on MAX speed.

11

The DAC most likely doesn’t have a temperature sensor since it’s a DAC.

12

@mada3k Thanks and that is something for Mikrotik to adapt in ROS. If returned value == 255 then SFP does not have a temperature sensor. At least Mirkrotik thought of able setting the trigger value to 256 so that you can overwrite the warning.

Devices with a fan still get the value 255 C and try to cool down an DAC that has not a temperature sensor.

13

There is no standardization on what value modules/DACs without temp sensor return for temperature.
Some report 0x00 (0 decimal), some 0x14 (20 decimal), some 0xff (255 decimal)

It obviously would make sense for ROS sense to ignore a reported SFP temp of 255 degrees (0xff) for fan control.
Yet not implemented that way in ROS7 since its beginnings, despite being reported several times to support and also here in the forum.