MR33 CRC align errors

[fabian5]

Does anyone know where crc errors can come from. the cable has already been replaced. The access point has also been replaced.

[Peter Zsiros]

What would be the right process to follow if this CRC problem started on 25.11?

I have rebooted the AP already.

[Shaun Bender]

Support replaced our AP — same issue with the replacement. Then shortly after a firmware update was released addressing the issue. Also, we do not use any “Release Candidate” firmware now, and are slow to adopt “Stable”. If you downgrade the firmware and the issue goes away, something bad in the firmware.

[kusumanegarait]

Is the problem solved by firmware version?

[GreenMan]

Firmware 25.8 for MR includes a fix in relation to CRC errors. If you look in the Bug fixes section of the 25.8 Release Notes (you have seen the Release Notes now available through Organization > Firmware upgrades, right? If not - go take a look, there's loads of good stuff there!):

"Ethernet phy configuration issue caused CRCs on upstream switch ports (MR33/MR30H/MR74)"

Note, however, that CRC errors do occur on wired links, regardless of this fix - maybe due to a faulty patch lead or other wiring related issue. The best advice would be to review the Release Notes and consider moving to a release with this fix (25.9 would currently be best). Hopefully you see CRC errors greatly reduced but, if you're still seeing them, then commence troubleshooting your connection in the usual way. If it's a Meraki MS switch your MR33 is connected to, probably worth starting with a cable test on the port in question.

[kusumanegarait]

On me, this problem doesn't only happen to my MR but also to the other devices which connected to my MS such as network printer, and D-Link switch. I use MR-16 & MR-12 with MS-22 & MS-42P. I have tried to change the cable as a sample, but I get the same result. My MR has up-to-date firmware version. So, do I need to try to upgrade the MR firmware to 25.8 or higher?

[GreenMan]

OK so it sounds like this is a different problem. I suggest you raise a case with the Support team, if you haven't already. they may well ask if your MS switch is running the latest firmware too, so if you can, you might want to upgrade it and re-test beforehand.

[kusumanegarait]

Dear GreenMan,

Okay, thank you for your advice.

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