Hello,
I’m facing a port flapping issue with a hEX device running RouterOS 6.49.6 and hope you can help me fix the problem.
The context is the following:
- One of my computer (running Windows 10, genuine license, system up to date) is connected through ethernet (Intel I211 controller) to port ether4 of the hEX device.
- Ether4 is an access port for vlan420 (ingress filtering on, admit only untagged), and ether1 is used as the trunk).
- Ether4 is set to autonegotiation (1Gbps full duplex is negotiated).
- Other devices connected to the hEX are on other vlans
- Other devices are a printer (ether5, 100Mpbs) and linux machines (Ether2 and ether3, 1Gbps) there is no port flapping problems with these devices
Sometimes right after having booted, sometimes after 5 minutes, sometimes after 20 minutes, the port to which the Windows machine is connected (ether4) starts flapping (link down,then link up after 2 seconds, then again link down after 3 to 5 seconds, rinse and repeat until Windows machine is rebooted.) I cannot find a cause for it.
Here is what I tried so far:
- Change the cable → issue remains
- change access port from ether4 to ether2 → issue remains
- change access port from ether4 to ether3 → issue remains
- Disconnect the printer → issue remains
- Disconnect all other devices connected to the hEX → issue remains
- turn off powersaving for the network adapter in Windows 10 → issue remains
- limit autonegotiation announcement on hEX side to 1Gbps → issue remains
- turn off autonegotiation (set manually to 1Gbps on both windows and hEX sides) → no network detected at all…
- placed a netgear unmanaged Gigabit switch between hEX’s ether4 port and the Windows computer → problem solved, no flapping anymore !
So apparently something’s wrong / uncompatible between the hEX and the computer running Windows… I could leave it “as is” with the switch inbetween, but from a power saving perspective, it’s kind of stupid to have an additionnal device just to connect a single computer…
Has anybody faced the same type of problem ? Do you have any suggestion ?
Thanks in advance,