Solved: MAC Bit error exceeded threshold

kiran.sn · ‎03-05-2009

Hi All,

I am getting the following error on a brand new MDS 9124 and the port gets disabled.

Module Slot Number: 1

Device Id : 92

Device Name : Atlantis-fcp

Device Errorcode : 0xc5c00503

Device ID : 92 (0x5c)

Device Instance : 00 (0x00)

Dev Type (HW/SW) : 05 (0x05)

ErrNum (devInfo) : 03 (0x03)

System Errorcode : 0x4042001e MAC Bit error exceeded threshold

Error Type : Warning

PhyPortLayer : Fibre Channel

Port(s) Affected : 12

Error Description : MAC Bit error exceeded threshold [ITW]

DSAP : 0 (0x0)

UUID : 414 (0x19e)

Time : Thu Mar 5 07:35:56 2009

(Ticks: 49AF80DC jiffies)

Any suggestion pls..?

Regards,

KK

Michael Brown · ‎03-05-2009

I would start with replacing the SFP and the cable. This is normally a physical issue like a damaged or incorrect fiber, faulty patch panel, or defective SFP.

I have seen this occur when a SM fibre was used with MM SFPs.

You might want to move the device on port 12 to another port and see if the problem moves with the device.

The port is logging ITW (invalid transmission words) this is a bit level error occurring with the data stream. At a pre-determined threshold, the port is shut down.

Hope this helps,

Mike

View solution in original post

Michael Brown · ‎03-05-2009

I would start with replacing the SFP and the cable. This is normally a physical issue like a damaged or incorrect fiber, faulty patch panel, or defective SFP.

I have seen this occur when a SM fibre was used with MM SFPs.

You might want to move the device on port 12 to another port and see if the problem moves with the device.

The port is logging ITW (invalid transmission words) this is a bit level error occurring with the data stream. At a pre-determined threshold, the port is shut down.

Hope this helps,

Mike

kiran.sn · ‎03-06-2009

Hi Mike.

Thank you and the issue resolved after replacing the cable.

Thx for timely response.

Rgd,

KK