2M QSFP+ to 4 x SFP+ breakout cable - $7

[BlueFox]

Quick search indicates mixed results on these and some switches being picky about compatibility, but if they'll work for you, I think it's hard to beat the price.

2M Cisco QSFP-4SFP10G-CU2M Compatible QSFP+ to 4SFP+ Breakout Cable - Monoprice.com

 

[BLinux]

Wondering how well these would work with Arista 7050qx-32?

 

[aij]

Would these work with Mellanox ConnectX2 cards? (Even if just for a single channel.)

 

[Rand__]

Would these work with Mellanox ConnectX2 cards? (Even if just for a single channel.)

A SFP+ one? likely, they are not picky.
QSFP? No, thats not supported.



And I'd liked to get on but too expensive shipping

 

[snclawson]

Would these work with Mellanox ConnectX2 cards? (Even if just for a single channel.)

I’ve used cables like these to connect my dual port QSFP ConnectX2 cards to switch SFP+ ports using the first channel. You end up with a lot of extra cable just hanging around, but it’s a lot cheaper than buying an adapter and a regular SFP+ DAC cable.

 

[Rand__]

I’ve used cables like these to connect my dual port QSFP ConnectX2 cards to switch SFP+ ports using the first channel. You end up with a lot of extra cable just hanging around, but it’s a lot cheaper than buying an adapter and a regular SFP+ DAC cable.

So the first channel works and only the splitting does not? Now thats interesting ! Thanks

 

[i386]

It's replaced by 100gbe and qsfp28 infrastructure. There are new breakout cables like 100gbe to 4x 25gbe or 100gbe to 2x 50gbe.
Yes, it's cisco quality.

 

[K D]

So the first channel works and only the splitting does not? Now thats interesting ! Thanks

My interpretation of his statement was that he is just using the first channel. I dont think he means he rest don't work.

 

[Rand__]

True but it makes sense the way I read it (I think).
On a MLX switch the first channel of a 4:1 split cable works as well without configuring the QSFP port as split port. The MLX Card does not support 4:1 split at all (none of the connectx does afaik). So I assume that the relevant sfp+ pins (probably the first bunch) are simply patched through on the qsfp cable.
Mind thats pure guesswork

 

[K D]

Makes sense.

 

[larryexchange]

There is an old thread talking about the similar cable (1M instead of 2M) is not compatible with other switch than CISCO.
Warnings about $3 Monoprice QSFP -> 4x SFP+ and QSFP cable

I am considering whether or not I should cancel my order.