Autonegotiation failure after ROS upgrade

Hardware MikroTik hardware general
1

Hi,

I had 1x RB750 (v4.11) connecting port 1 to RB411 (v3.23)

There is a digital timer which switches off the power for some switches and the RB750 for 15 minutes at 03h00

After the power resumed everything was working again.

I upgraded both to v4.14

Since the upgrade, when the power resumes there is auto-negotiation failure on port one on the RB750, (connected to the RB411)

I have to log in on Winbox and change the settings in Interface for the offending Port to get it up again. Its annoying.

Anyone experience this? How to resolve?

2

What power supply are you using?

3

The RB750 was supplied with a 12v 500mA power supply in the packaging.

The RB411 is a CPE owned by the ISP:
The RB411 has a 12v 0.8A power supply which is probably supplied seperately. It also has a PoE injector so the power is supplied to the Eternet port.

I had the situation yesterday where the autonegotiation did not fail, and the interface reported it was up; 100mb full duplex, at 11h00 suddenly we had 80% packet loss. Tried several things including upgrade to 4.16

My solution is turn off autonegotiation on the RB750 Eth1 (WAN) interface and set it to 10mbps full duplex…

4

This morning the WAN interface reports an error. I can get it working if I disable the interface and enable it. This is not ideal, so:

Downgraded to 4.11 and everything seems to work including autonegotiating 100mbps full duplex. From other posts it would seem that the 1A power supply is required, especially if you upgrade to 4.14 - 4.16.

The 750 ships with a 500mA power supply, at least mine did, but I think I will get a 1A one soon.

5

I’ve had no issues with original 500ma PSU on any of my RB750 (2nd version, with silk screen for USB). ROS4.5, 4.10, 4.11.

6

Hi rmichael,

I only had issues when I upgraded to 4.14 and 4.16

I downgraded to 4.11 and its fine -been up for 22 hours no problems (on the 500mA power supply).

Edit: after 23hours up, suddenly there is 80-90% packet loss on the Eth1 (WAN) port. Seems the problem is not the ROS version but more likely the power supply.

I will replace the power supply as soon as my supplier re-opens in January. Until then the interface is set to 10mbps full duplex, auto-negotiation disabled.

7

Just out of interest, how many ports are in use?

I have all 5 ports in use - the autonegotiation failure only happens on the WAN port (Eth1)

I suspect that the more devices connected the more juice it needs…

8

My 1A power supply arrived - I am now running with autonegotiation 100MB on the WAN port.