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Pea
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Ethernet port faulty?

Sat Oct 15, 2016 12:09 am

Hi,
I have RB951G-2HnD (v6.37.1, fw3.33), which has five Gigabit Ethernet ports.
The ether1-4 (my WAN, LAN1-LAN3) sync on 1G normally.
But ether5 (my LAN4) sync only on 100M (and negotiation takes longer).
Attached screenshot shows log when I move one cable from ether2 (LAN1) to ether3 (LAN2)...to ether5 (LAN4).
If I select to negotiate only 1G on ether5 then computer is not connecting at all.

Is my router faulty? Or what can be the cause?
Thanks.
/interface ethernet
set [ find default-name=ether1 ] name=WAN
set [ find default-name=ether2 ] name=LAN1
set [ find default-name=ether3 ] master-port=LAN1 name=LAN2
set [ find default-name=ether4 ] master-port=LAN1 name=LAN3
set [ find default-name=ether5 ] master-port=LAN1 name=LAN4
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patrick7
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Re: Ethernet port faulty?

Sat Oct 15, 2016 12:16 am

Have you tried replace the cable? If there are not enough copper wires in the cable, gigabit will never work.
 
Pea
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Re: Ethernet port faulty?

Sat Oct 15, 2016 12:25 am

I use only CAT6 cables.
For test I connected only one computer which negotiates with ether1-4 on 1G but when I move that only cable to ether5 it negotiates on 100M.
From my logic this cannot be caused by cable or connected device. Anyway I tested 3 gigabit devices and few cables with same result.
 
skuykend
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Re: Ethernet port faulty?

Sat Oct 15, 2016 12:35 am

1G does use all 8 wires where 100M uses only 4. Take a flashlight and see if one of the wires in port 5 is 'off track" of dirty. Otherwise something may be burned out for one of those wire paths for that port and can't be fixed economically.
 
Pea
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Posts: 230
Joined: Fri Jul 17, 2015 11:07 pm
Location: Czech

Re: Ethernet port faulty?

Mon Oct 17, 2016 9:27 pm

The ether5 connector looks perfect, same as others ether1-4. So it seems it is hardware failure.
It is still in warranty, I will contact my dealer to exchange device.

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