Ethernet - link down

mohanad1989 · Mon Sep 04, 2023 5:49 pm

Hello,

I'm currently facing an intermittent issue with a link going down and then coming back up on the CCR2004-16G-2S+ RouterOS 7.11, affecting both the WAN and LAN ports and consequently impacting the service.

I've taken several steps to address the problem:

-Replaced the cables.
-Manually configured the interface speed to 1 Gbps after disabling auto-negotiation.
-Deactivated loop protection.
-Restarting the device.

Example of the recurring log entries appear as follows every few minutes:
22:16:44, interface, info ether1- link down.
22:16:47, interface, info ether1- link up (speed 1G, full duplex).

I'm actively working on resolving this issue to restore stable connectivity.
any help is appreciated

Thank you

mkx · Mon Sep 04, 2023 8:39 pm

7.11.1 changelog contains quite a few items mentioning bridge and stability in same sentence. Some mentioning bugs introduced in 7.10 or 7.11 ...

Beware that 7.11.1 contains a bug in DHCP server, so you probably want to upgrade to 7.11.2.

mohanad1989 · Tue Sep 05, 2023 4:42 am

7.11.1 changelog contains quite a few items mentioning bridge and stability in same sentence. Some mentioning bugs introduced in 7.10 or 7.11 ...

Beware that 7.11.1 contains a bug in DHCP server, so you probably want to upgrade to 7.11.2.

Thank you, I upgraded tp OS 7.11.2, Hope the issue will be resolved

mohanad1989 · Tue Sep 05, 2023 8:29 am

Unfortunately, after upgrading to OS 7.11.2, the issue still exists.

patrickmkt · Tue Sep 05, 2023 1:50 pm

I also had my ether 1 port going up and down recently on a CCR1036.
I too changed cables without success.

I have not found the solution yet, but for the time being, I migrated to another eth port that was available to get my system running.

mohanad1989 · Tue Sep 05, 2023 7:56 pm

I also had my ether 1 port going up and down recently on a CCR1036.
I too changed cables without success.

I have not found the solution yet, but for the time being, I migrated to another eth port that was available to get my system running.

If I'm the case is only ether1 then im ok can change the port, but its happening in all used ports! The issue wasn't happening on os 6.49 only happens with os 7
I hope mikrotik do something about it

mkx · Tue Sep 05, 2023 10:04 pm

Such things are hard to replicate. So ideally you would create a supout.rif file while any of ports are down and another one soon after the flapping port gets up again. Then open a support ticket and provide both files to MT. That would give them chance to figure out what's happening.

mohanad1989 · Wed Sep 06, 2023 5:06 am

Such things are hard to replicate. So ideally you would create a supout.rif file while any of ports are down and another one soon after the flapping port gets up again. Then open a support ticket and provide both files to MT. That would give them chance to figure out what's happening.

Thank you, I have upload the support.rif to Mikrotik support hope they reply me

mohanad1989 · Thu Sep 07, 2023 12:54 pm

Here is a screenshot, can anybody help me?

Ca6ko · Thu Sep 07, 2023 1:17 pm

Category 6 cables? If yes, try changing to cat5

mohanad1989 · Thu Sep 07, 2023 1:27 pm

Category 6 cables? If yes, try changing to cat5

I already tried to change the cables, and this issue is not happening with our router running Os 6.49 only the router with Os 7
which I suspect is software or hardware issue

Ca6ko · Thu Sep 07, 2023 10:21 pm

downgrade 7.8

mohanad1989 · Fri Sep 08, 2023 6:29 am

downgrade 7.8

Thank you for your suggestion, I done downgrade but the issue still happen

Ca6ko · Fri Sep 08, 2023 9:17 am

but the issue still happen

Downgrade the version until the problem goes away

mohanad1989 · Fri Sep 08, 2023 5:01 pm

but the issue still happen
Downgrade the version until the problem goes away

I downgraded until 7.4.1 which is the factory firmware and still happen!!!

mohanad1989 · Mon Sep 11, 2023 4:45 pm

I installed a Switch between WAN and Mikrotik and noticed it worked without the port dropping!
Like in the photo below
any idea why?

beeonline · Wed Sep 27, 2023 9:09 am

I have many towers where i get link flapping.
Some of them happen every day, others - randomly.
Many just don't flap at all.

The switches i use are CRS326

Not i have 2 main places where it happens a lot:
CRS326 + LHG60
There are other LHG60's in the same spot and only one would drop the link. Cable has been replaced, no change.

CRS326+UBNT PowerBeam AC5 Gen2

It randomly switches to 1gbit, than drops to 100mbps a hundred times a day.
After some time it will stop flapping and works ok, than next day it starts again.
SNR in the ubnt antenna is 30 at all pairs..

I use the same shielded cable for the links.

UPD:
And now when i disabled auto negotiation,
interface status says 100mbps full duplex, but in the powerbeam it says 100mbps half duplex. Which one to trust?

FW versions are latest for today (CRS326 was 6.47 until today, but nothing changed after upgrade both FW+Bootloader)

mkx · Wed Sep 27, 2023 10:59 am

And now when i disabled auto negotiation,
interface status says 100mbps full duplex, but in the powerbeam it says 100mbps half duplex. Which one to trust?

You should trust both sides ... because without auto negotiation each side uses whatever it's set to do. In your case you have a duplex-mismatch which can (and will) disrupt traffic occasionally (more if link is loaded higher). So by all means change settings so that they match on both sides. I'd go with full duplex unless you encounter some problems.

flyingduck · Thu Nov 09, 2023 6:14 pm

I installed a Switch between WAN and Mikrotik and noticed it worked without the port dropping!
Like in the photo below
any idea why?

hello, I encountered the same problem as you, you image link is down, could you please re-upload it again, how to put the switch, this problem has haunted me for so long.

mada3k · Thu Nov 09, 2023 8:45 pm

Are you using shielded cables?

Soochi · Tue Nov 21, 2023 1:02 pm

This seems like a new thing cause i started experiencing this and all ports go off and on affecting connection stability.

Try2StopMe · Tue Nov 28, 2023 10:27 am

The same goes for CCR2004-16G-2S+, RouterOS v7.12.1. There are random port drops

djani · Thu Nov 30, 2023 9:58 am

Hello.
I have the same problem with my: CRS354-48P-4S-2Q+ I have four of them.
All have random port drops.
Changing Cables didn't help, upgrade and downgrade also.
Switching off Poe also didn't help either.
Currently they working on verssion: 7.12.1

I'm out of ideas.

20061985 · Sat Dec 02, 2023 9:58 am

Hi everyone.
I want to tell the same story with CCR2004-16G-2S+, RouterOS v7.12.1.

Half of the ethernet ports are simultaneously going down at the same time for a few seconds. That happens with ports that are located on switch 2 inside the Mikrotik. please see the attached image.

1. mohand1989, could you check if that happens with all of your ports or if it is related to ports on one internal switch?
2. If someone from Mirkotik will read it. I would like some advice on what can I do with it.

Thank you.

toquanghieu · Fri Jan 05, 2024 2:47 pm

I get same issue with my rb5009 on 2.5G port, do you have any idea to fix it

Simonth · Fri Jan 26, 2024 8:26 pm

Same issue on a brand new CRS312-4C+8XG-RM aswell, both on 7.13.3 and on 7.13.2. On 7.13.2 it worked fine for about a day before it started happening, on 7.13.3 the links started to go down/up after 5mins.

Nisma · Sat Feb 03, 2024 5:28 pm

Experiencing same issue on RB2011UiAS

ColdFire2000 · Thu Aug 01, 2024 2:52 pm

this problem occurs on almost all existing routers....
How does someone solve it?

DoubleDB · Sat Aug 03, 2024 1:06 pm

I'm having the same problem on hAp ac2
ether1 and ether5 manage to link to 1G, all other ports flap at 100M.
Tried upgrading to latest stable - no difference .....

Tried 10 different cables connecting mikrotik's ports to a gigabit switch - Nope.... 100M only.

DoubleDB · Sat Aug 03, 2024 1:48 pm

I've found something (probably coincidence)....... IF the ports are added via interface list (for example - LAN) to the bridge - they link @ 100M.
If I remove 1 of the interfaces from the LAN group and add it manually to the bridge - links @ 1Gbbs.

But...... that again was temporary - managed to run a single speed test, after which the port dropped down to 100M.

And more weird - even though "Partner" advertises 1G, when the port drops to 100M it doesn't show "Link partner advertising" 1G.

DoubleDB · Sat Aug 03, 2024 4:03 pm

So... final entry.

Turns out the link "downgrade" was caused by ... well... device overheating.
Random ports, at random times.

I removed the device (hap ac2) from the enclosure - it behaves a lot better now.

Edit #3 - problem is not from overheating ... disassembled the hap ac2, stuck a decent airflow fan on top of the heatsink - no difference.
Using all Cat 6 FTP cables.

Ports link randomly at 1G / 100M / 10M whenever the device feels like f-ing a port from 1G to 100 or 10M.
You unplug port 4, port 3 and 2 go down as well, then whoa 2 of them link at 100M, 1 links at 1G, then the 1G port starts "playing" around trying to "negotiate" link speed 100 times until it settles at 100M.

Port 3 which is directly connected to a tp-link gigabit switch over 1m patch cable (again, ftp cat 6) - in the majority of time negotiates 100M. Tried 5 different cables (utp/ftp cat 5/6) - no difference whatsoever. If I manage to somehow make it link at 1G it doesn't stay long.

It's a shit show. The only ports there's no problem with (are always at 1G) are 1 and 5.

koalan · Thu Nov 21, 2024 9:31 am

I have the same issues with the same model. i'm not sure, but i suppose it have started after my device stuck and i have to reset it.

[admin@MikroTik] /system/resource> pr
                   uptime: 1w6d1h46m57s
                  version: 7.16.1 (stable)
               build-time: 2024-10-10 14:03:32
         factory-software: 6.44
              free-memory: 48.0MiB
             total-memory: 128.0MiB
                      cpu: ARM
                cpu-count: 4
            cpu-frequency: 448MHz
                 cpu-load: 1%
           free-hdd-space: 308.0KiB
          total-hdd-space: 16.0MiB
  write-sect-since-reboot: 42342
         write-sect-total: 87286
        architecture-name: arm
               board-name: hAP ac^2
                 platform: MikroTik

[admin@MikroTik] /system/resource> /log pr where message~"down"
11-17 10:29:53 interface,info ether3 link down
11-17 10:30:15 interface,info ether3 link down
11-17 11:03:25 interface,info ether3 link down
11-17 11:03:46 interface,info ether3 link down
11-17 12:03:58 interface,info ether3 link down
11-17 14:03:23 interface,info ether3 link down
11-19 21:14:33 interface,info ether3 link down
11-19 21:14:42 interface,info ether3 link down
11-19 21:14:49 interface,info ether3 link down
11-20 10:37:24 interface,info ether3 link down
11-20 10:37:27 interface,info ether3 link down
11-20 10:37:35 interface,info ether3 link down
11-20 17:34:33 interface,info ether1 link down
11-20 17:34:33 interface,info ether3 link down
11-20 17:34:33 interface,info ether4 link down
11-20 17:34:35 interface,info ether5 link down
11-20 17:34:43 interface,info ether3 link down
11-20 17:34:46 interface,info ether3 link down
11-20 17:34:49 interface,info ether3 link down
11-20 17:34:53 interface,info ether3 link down
11-20 21:51:39 interface,info ether3 link down
 11-20 21:51:50 interface,info ether4 link down
 11-20 21:52:05 interface,info ether5 link down
 04:49:23 interface,info ether4 link down
 04:50:28 interface,info ether4 link down
 11:41:01 interface,info ether4 link down
 11:41:06 interface,info ether4 link down
 13:07:46 interface,info ether4 link down
 13:09:49 interface,info ether4 link down
 16:06:11 interface,info ether3 link down
 16:06:36 interface,info ether3 link down
 16:51:33 interface,info ether3 link down
 16:51:51 interface,info ether3 link down

Ethernet - link down

Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

Re: Ethernet - link down

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