05-15-2016 08:26 AM - edited 05-15-2016 08:40 AM
I have a vdx-6720-24 I got used on ebay. I reset it (I thought) to factory default, but it would not work with the passive twinax cables I already had. Some googling told me those are not supported - I would see messages about incompatible SFP transceivers. I unplugged them and replaced with Proline active twinax 1M cables. Now, I no longer see that message, but the brocade immediately puts the port down administratively. The other end is connected to an intel x520-da2. I have tried multiple ports, and they all seem to behave the same way. Any thoughts/tips would be appreciated...
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05-15-2016 09:38 AM - edited 05-15-2016 09:44 AM
1m Twinax copper cable
3m Twinax copper cable
5m Twinax copper cable
05-26-2016 06:56 AM
Okay, I got several of the 3m cables. Plug them in, and the ports go green. Had some confusion initially, because packets were not being forwarded. Google revealed that is disabled by default (bizarre, but okay). Had to set switchport mode for some reason. I tried using iperf to test speeds between hosts and was getting only a few mb/sec (using ports 1-4). Tons of CRC and transmit errors. Out of desperation, I moved cables to ports 10, 12, 13 and 15. Works much better, and I am getting 2-4gb/sec now. I note the two ports my test hosts are on do get some CRC and transmit errors, but a fairly small percentage. The fact that ports 1-4 were almost unusable makes me suspect some issue with the switch, but 2-4gb/sec is good enough for now, I suppose. Any thoughts as to the CRC/xmit errors?
05-26-2016 07:00 AM
These were supposedly brocade cables (the transceivers say brocade), but 'show media' shows:
Vendor Name OEM
Vendor OUI 00:05:1e
Vendor PN SFP-10GH-3M
Vendor Rev A
Makes me wonder if these are knockoffs. Could this be related to the errors I am seeing?