Hi,
I have a number of QSFP28 AOC fibre 1x4 breakout cables that used to work fine in Onyx 3.9.1908, but since upgrading to Onyx 3.10.X these cables no longer work. The cables are all Mellanox branded and bought from FS.
identifier : QSFP28
cable/module type : Active optical cable
ethernet speed and type: 100G AOC, FEC based
vendor : Mellanox
cable length : 3m
part number : Q-4S28AO03
revision : A3
serial number : C2205036149
Since upgrading the link diagnostics just say “Cable speed not enabled” and there is no link up. It doesn’t matter if the other end is plugged in or not.
If I set the interface to “speed auto” I get “Negotiation failure”, so that seems to make a difference, but this interface needs to be an MLAG member, so I can’t set it to auto.
After much Googling I have not been able to find out what this error means or how to resolve this problem.
The interface on my test switch has no config beyond the default.
Admin state : Enabled
Operational state : Down
Last change in operational status: Never
Boot delay time : 0 sec
Description : N/A
Mac address : 1c:34:da:32:f2:d8
MTU : 9216 bytes (Maximum packet size 9238 bytes)
Fec : auto
Operational Fec : N/A
Flow-control : receive off send off
Supported speeds : 1G 10G 25G
Advertised speeds : 25G
Actual speed : Unknown
Auto-negotiation : Enabled
Width reduction mode : Unknown
Switchport mode : access
MAC learning mode : Enabled
Forwarding mode : inherited cut-through
Can anyone explain what is going on here?