After a whole lot of tests i was able to find out that the ports are bad on the switch itself.. Fun times!
please post your config. Yeah, I know you said you have stacking disabled - but worth a look.
For the rear connections:
I'm currently using AOC QSFP to SFP+ breakouts (generic/cisco) and they work great. I've tested generic QSFP to SFP+ DAC - worked fine too.
I've used netapp QSFP to QSFP for stacking on both the 40gbe and breakouts. - worked fine
I've used AOC QSFP to QSFP for switch to host - that also worked fine.
Nothing magical in the cables I've used - in fact they were the cheapest I could find of their respective types - configs were pretty much stock on the 1/2/x side.
when you say reg fs DAC cables work, going from the front sfp+ connections to the servers?
what did show int give you on the breakout ports when you were testing?
for example here's a snippet from my show run on a standalone icx6610 and as you can see nothing configured for my 1/2/x ports and they all work for hosts:
2 10gbe in use, 40gbe configured but host is down at the moment. That's with a generic 40gbe to 10gbe AOC breakout.Code:! lag LAG41 dynamic id 41 ports ethernet 1/2/1 ethernet 1/2/6 primary-port 1/2/6 deploy ! ... ! interface ethernet 1/1/24 dual-mode 249 inline power ! interface ethernet 1/3/1 speed-duplex 10G-full !
Code:SSH@icx6610-stack#show inter br ethe 1/2/1 to 1/2/10 Port Link State Dupl Speed Trunk Tag Pvid Pri MAC Name 1/2/1 Down None None None 41 Yes N/A 0 748e.f8dc.ae80 1/2/2 Down None None None None Yes N/A 0 748e.f8dc.ae80 1/2/3 Down None None None None Yes N/A 0 748e.f8dc.ae80 1/2/4 Down None None None None Yes N/A 0 748e.f8dc.ae80 1/2/5 Up Forward Full 10G None Yes N/A 0 748e.f8dc.ae80 1/2/6 Down None None None 41 Yes N/A 0 748e.f8dc.ae80 1/2/7 Down None None None None Yes N/A 0 748e.f8dc.ae80 1/2/8 Down None None None None Yes N/A 0 748e.f8dc.ae80 1/2/9 Down None None None None Yes N/A 0 748e.f8dc.ae80 1/2/10 Up Forward Full 10G None Yes N/A 0 748e.f8dc.ae80 SSH@icx6610-stack#