topic Re: MR33 CRC align errors in Wireless

MR33 CRC align errors

fabian5 — Sun, 24 Sep 2017 08:07:39 GMT

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

Re: MR33 CRC align errors

Philip D'Ath — Sun, 24 Sep 2017 18:39:53 GMT

Is the port that it plugs into configured for auto/auto?

Re: MR33 CRC align errors

Philip D'Ath — Sun, 24 Sep 2017 18:40:40 GMT

You could also try plugging it into a different switch port.

Re: MR33 CRC align errors

fabian5 — Sun, 24 Sep 2017 19:56:19 GMT

the port configuration is the following:

Description	Trunk port using native VLAN 1; allowed VLANs: all
Tags	none
PoE	Enabled
Link negotiation	Auto negotiate (1 Gbps)
RSTP	Forwarding
Port schedule	Unscheduled
Isolation	Disabled
Port mirroring	Not mirroring traffic

I have already tried all ports

Re: MR33 CRC align errors

MilesMeraki — Sun, 24 Sep 2017 20:39:28 GMT

Do you have a different switch available? - Try the cable and AP in another switch and see if CRC's are still reported - Could be a faulty switch.

Re: MR33 CRC align errors

fabian5 — Sun, 24 Sep 2017 20:43:59 GMT

I took an MR32 from another network and this one didn't generate crosstalks.

Re: MR33 CRC align errors

fabian5 — Tue, 26 Sep 2017 19:52:37 GMT

update from meraki case team:

"The issue you are experiencing with your MR33 is a documented issue that our engineers are currently taking a look at."

Re: MR33 CRC align errors

pjc — Wed, 27 Sep 2017 11:07:20 GMT

I can't help you, but how do you view packet stats on an MR AP ? I cannot see this in any menu. I running 24.8 (latest stable production), is this in newer beta versions?

Thanks

Re: MR33 CRC align errors

fabian5 — Thu, 28 Sep 2017 18:52:10 GMT

the status can be displayed on the MS Switch. not at the MR Access Point

Re: MR33 CRC align errors

benspringael — Fri, 29 Sep 2017 15:02:35 GMT

I am seeing the same issues on the network of a client.

At the moment it's fine again without changing anything. I'll log a support case as well with Meraki.

I'de say keep this topic up to date with any feedback you get from the support team.

I checked the firmware releases and even in Beta I don't see any fixes for this issue.

Cheers,

Ben

Re: MR33 CRC align errors

Shaun Bender — Fri, 06 Oct 2017 17:32:44 GMT

I’m seeing this issue also, with an MR33 on a Meraki MS220-24P switch. I was running 24.7, that’s when I noticed the issues show, then dropped to 24.6, still showing the same issue. The APs are now on 24.11 Stable, and showing the same issue. The MS220-24P is running 9.30 Stable, I’ll be testing with downgrading that later today to see if the issue is still shown.

But as right now, running “Stable” code and seeing the issue, once again makes me wonder what testing is actually done on the Meraki side??

Re: MR33 CRC align errors

Shaun Bender — Fri, 06 Oct 2017 19:49:17 GMT

Update: MR33 is being replaced. Moved AP code back to 25.7 and put in an MR32(as a temp in place of the 33). As of right now, odd that the AP suddenly “died”. However, 32 is not showing any issues as the 33. I have another site with a 33, will test at that location for similiar issues and post a reply.

Re: MR33 CRC align errors

fabian5 — Tue, 17 Oct 2017 20:25:14 GMT

I have an update from Meraki Support

"We have released a new firmware version, 25-8, which contains a fix for the CRC error issue.

Thank you"

Re: MR33 CRC align errors

BradF — Wed, 22 Nov 2017 00:13:12 GMT

I have a new CNMA stack here in my Lab and since it has been installed I am seeing too many CRC errors between the switch and the MR33. Can I get confirmation of this new firmware it is reporting current.

I have replaced all the cables and switch ports so I am at a loss.

Re: MR33 CRC align errors

GreenMan — Fri, 24 Nov 2017 19:32:53 GMT

25-8 is the latest 'beta'. Your Dashboard may be reporting you're on the latest 'stable / GA'. If you want to try r25 (& there's lots of good stuff in it - see Help > New features) then you'll need to select Try beta firmware under Network-wide > Configure > General (under "Firmware upgrades"). In a combined network, this will, by default, affect switches and MX etc if they exist in the same Network. Dashboard will (currently) upgrade the APs in your Network to 25.8, at the next configured Upgrade window.

Re: MR33 CRC align errors

kusumanegarait — Tue, 30 Jan 2018 09:11:31 GMT

Is the problem solved by firmware version?

Re: MR33 CRC align errors

GreenMan — Tue, 30 Jan 2018 09:43:09 GMT

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.

Re: MR33 CRC align errors

kusumanegarait — Tue, 30 Jan 2018 12:51:46 GMT

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?

Re: MR33 CRC align errors

GreenMan — Tue, 30 Jan 2018 12:58:55 GMT

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.

Re: MR33 CRC align errors

kusumanegarait — Tue, 30 Jan 2018 13:02:51 GMT

Dear GreenMan,

Okay, thank you for your advice.