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*UPDATE* The intermittent dropping was due to using the metal Trendnet Cat6A Keystone Jacks. I replaced those with the plastic keystone jacks from Monoprice and it fixed the issue. Hope this helps someone in the future.

actually, I figured this out... I feel totally stupid. I should have used iperf3 and not gone by simple file transfers of large files to test.... LOL

I have one of these 40Gbe NICs ( HP 544QSFP MCX354A-FCBT 649281-B21 656089-001 VPI FDR 40GbE Mellanox OEMFirmware | eBay ) installed on my Windows 10 computer that is using an Asrock Fatality x399 Gaming motherboard. I'm using the same NIC on other computers on this same network without issue...

Update... i replaced the Netgear switch with an Arista DCS-7050T-64 and have the same issue. Is there software that can monitor all ports and log issues? or will i literally have to connect 1 port at a time and wait to find the line that's the culprit? (will take a long time with 40+ ports :( )

Is this the correct cable to connect Port1 and Port2? Mellanox MC2206130-00A 40G QSFP+ DAC Cable

Is there a better 40gbe nic to use for Windows 10?

@hmw It's QSFP... i don't have a cable to connect port1 to port2 :( ... i just have a fiber line run from my office to network closet upstairs

I went to admn cmd prompt and ran mlxconfig -d mt4099_pciconf0 set VPI_SETTINGS_PORT1=2 and then i did it again for port2=2... then i restarted machine, but, when i run ibv_devinfo from cmd prompt it looks like the firmware version is 2.42.5000 but both port 1 and port 2 are listed as Down...

They are in ETH mode

When i run ibv_devinfo it looks like firmware version is 2.42.5000 but both port 1 and port 2 are listed as Down... does that firmware version work with windows 10?

@hmw I downloaded MLNX_VPI_WinOF-5_50_53000_All_Win2019_x64 ... i guess that's WinOF? I didnt know about Mellanox firmware tools.. i'm downloading that now... Is it pretty straight forward? Thanks!

I purchased some of these cards: HP 544QSFP MCX354A-FCBT 649281-B21 656089-001 VPI FDR 40GbE Mellanox OEMFirmware | eBay Any tips on how to get these Mellanox 40gbe NICs to work in Win 10? I downloaded the driver for the equivalent mellanox part number MCX354A-FCBT, but it will not connect. Is...

actually, looks like Putty is the way to access console... i got putty connected.. yay

I'm new to these enterprise switches and could use some help/direction. I have an Arista DCS-7050T-64 switch. Looks like i connect my laptop to the console port, open up cmd prompt in windows 10, then type in commands. I am referencing this link for how to's: Section 2.1: Initial Switch Access -...

I just purchased an Arista DCS-7050T-64 switch, but the firmware is: Software image version: 4.12.7.1. I think the Arista website says latest is 4.19? Do i need to update this? If so, how do i get the latest? Thanks!

Can the 7050's be run with only one PSU to cut down on noise?

If i had it to do over, I would do all fiber. 40gbe is cheap these days since it is obsolete. You can get 40gbe switches for $200 or less.

Does anyone have an Arista DCS-7050T-64 switch for sale? I'm looking to buy at least 1 and maybe 2 of them. Or do you know where I can get these at a reasonable price? Thanks!

I have an old NORCO RPC-4224 4U Rackmount Server Case (24 bays). Is it worth using it to build the latest/greatest? or is it better to just buy something newer? Nothing in it is worth keeping. It has old 100mb cards, etc but the case was really nice back in the day.

@mmo i guess a DCS-7050T-52 or a DCS-7050T-64 will both work? They both seem to be RJ45 but the difference is one has SFP+ and other has QSFP+? i can connect either to a Mellanox SX6018 so should be fine with either?