Hi everyone,

I'm Joaquin, I have been working with Greg Taylor on porting the SNAP2 
firmware for the LWA stations in UNM to the ZCU102 board, some of you might 
have heard of this project, I received a lot of help from Jack and Wei and 
we are very close to make it work.

The reason I'm sending this message is because we can't figure out how to 
make the four SFP+ cages working as one single 40GbE link. I was wondering 
if someone else has done this before and if they can give me some advice on 
what to do. We are using the Q-4SPC01 breakout cable from FS that splits 
the QSFP+ connector into four SFP+ connectors, and we are also using 
the Arista 7060CX switch, we already tried two configurations on the 
switch, one for a single forced 40 GbE link and another configuration as 
a 4×10 GbE breakout with LACP (Port-Channel), the last configuration looks 
like is not going to work because it needs auto negotiation and this is not 
provided on the forty_gbe yellowblock. Neither of those configurations are 
recognizing the ZCU102 link on the switch, it recognizes the cable 
transceivers on low level but not the link. I have already tried a single 
10 GbE over one SFP+ cage using a Xilinx example and it works great.

I would appreciate it a lot if someone else that has already use a similar 
setup can maybe help me out with some tips. Thank you!

Joaquin

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