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Discmandj
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Posts: 128
Joined: Thu Mar 24, 2016 12:29 am

Ethernet Connection Error

Wed Oct 14, 2020 12:05 am

Hallo Mikrotik Users,
we have a Problem with Mikrotik ROS since version 6.47 ,
about 30 % of our Mikrotik ROS about 100 Board is getting the following error:
interface,info ether1 link up (speed 1G, full duplex)
07:32:20 interface,info ether1 link down
07:32:26 interface,info ether1 link up (speed 100M, full duplex)
08:13:50 interface,info ether1 link down
08:14:07 interface,info ether1 link up (speed 100M, full duplex)
08:59:41 interface,info ether1 link down
08:59:43 interface,info ether1 link up (speed 1G, full duplex)
09:00:46 interface,info ether1 link down
09:00:48 interface,info ether1 link up (speed 1G, full duplex)
09:00:50 interface,info ether1 link down
09:00:53 interface,info ether1 link up (speed 1G, full duplex)
09:00:54 interface,info ether1 link down

and keep on this all over wahtever version we update on many RouterBoard and many interfaces , all mikrotik are connected to mikrotik there is no other Router or switch in the networks.

we had to set interface were this problem occured to 100 Mbits speed then keep on connecting without problem.

thank you in advance
 
mkx
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Re: Ethernet Connection Error

Wed Oct 14, 2020 8:09 am

What is device connected to ether1 port on such mikrotiks? Did you check for potential cable and connector defects?
How about earthing of devices on both ends of link? Could be that there's some spurious current flowing through that cable disturbing data transfers ...
BR,
Metod
 
Discmandj
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Posts: 128
Joined: Thu Mar 24, 2016 12:29 am

Re: Ethernet Connection Error

Thu Oct 15, 2020 12:35 am

hello Friend , thank you for your reply,
all mikotiks are connected to mikrotiks device (only mikrotiks on all ends),
it couldnt be a problem with cable or so because we have this problem on many devices and on different locations or backbones.
 
sindy
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Re: Ethernet Connection Error

Thu Oct 15, 2020 11:05 am

it couldnt be a problem with cable or so because we have this problem on many devices and on different locations or backbones.
Well, if the same person was crimping all the cables, or the same lot of super-cheap connectors was used, or the same super-cheap crimping tool was used, it can still be a cabling problem. Connector matching boils down to fine mechanics after all, and yes it can go wrong. And even with good connectors and tool, connectors for stranded cable used on solid one or vice versa are a voucher for trouble.

For gigabit Ethernet, you need all four pairs in the cable to be OK; as soon as a single one doesn't work, the connection falls down to 100 Mbit/s which uses just two pairs.

But assuming it's not the case, you haven't responded to @mkx's suggestion regarding electromagnetic interference (in general) - what's the environment where the devices are operated? Residential or industrial objects? Maybe outdoor installations? What's the length of the cables, tens of yards/meters or less than two? Are the members of the device pairs which suffer from the issue powered from the same AC circuit?
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