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n21roadie
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Is port "Flapping" unique to Mikrotik

Tue Sep 03, 2013 3:51 pm

Can I ask is port flapping which is occurring on some ports of my RB1100Hx2 at random periods, is this issue unique to Mikrotik or does the same happen to other manufacturers routers?
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pcunite
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Re: Is port "Flapping" unique to Mikrotik

Tue Sep 03, 2013 4:14 pm

Happens enough to have documentation written up about it here and here. When troubleshooting unexpected link flapping, it is important to know: who initiated the link flap and the actual reason for the link being down. The common cause of link flap is a Layer 1 issue such as a bad cable, duplex mismatch, or bad Gigabit Interface Converter (GBIC) card.


Cause:
The bit rate exceeds the threshold and puts the port into an error disabled state.

Solution:
Disable and then enable the port.

Cause:
A hardware failure or intermittent hardware error causes a packet drop in the switch. A software error causes a packet drop. A control frame is erroneously sent to the device.

Solution:
Determine the reason for the link flap as indicated by the MAC driver.

Cause:
Link flapping on the upstream switch.

Solution:
Determine the reason for the link flap on that switch.
 
n21roadie
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Re: Is port "Flapping" unique to Mikrotik

Tue Sep 03, 2013 4:43 pm

Happens enough to have documentation written up about it here and here. When troubleshooting unexpected link flapping, it is important to know: who initiated the link flap and the actual reason for the link being down. The common cause of link flap is a Layer 1 issue such as a bad cable, duplex mismatch, or bad Gigabit Interface Converter (GBIC) card.


Cause:
The bit rate exceeds the threshold and puts the port into an error disabled state.

Solution:
Disable and then enable the port.

Cause:
A hardware failure or intermittent hardware error causes a packet drop in the switch. A software error causes a packet drop. A control frame is erroneously sent to the device.

Solution:
Determine the reason for the link flap as indicated by the MAC driver.

Cause:
Link flapping on the upstream switch.

Solution:
Determine the reason for the link flap on that switch.
Many thanks for your reply -
Cause:
The bit rate exceeds the threshold and puts the port into an error disabled state.

Can this be logged on Mikrotik?
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pcunite
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Re: Is port "Flapping" unique to Mikrotik

Tue Sep 03, 2013 6:50 pm

The bit rate exceeds the threshold and puts the port into an error disabled state.
Can this be logged on Mikrotik?
It would be nice if we could see the error in the logs. I don't know. Maybe MikroTik can respond to this issue too and give us some indication as to when it happens so you can recreate it.

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