# What cabling would one need to go from ConnectX-2 VPI to XFP 10Gigabit ethernet (with CX4 XFPs)

**URL:** <https://forums.developer.nvidia.com/t/what-cabling-would-one-need-to-go-from-connectx-2-vpi-to-xfp-10gigabit-ethernet-with-cx4-xfps/207896>\
**Category:** InfiniBand/VPI Adapter Cards\
**Created:** [May 5, 2015, 5:37pm UTC](https://forums.developer.nvidia.com/t/what-cabling-would-one-need-to-go-from-connectx-2-vpi-to-xfp-10gigabit-ethernet-with-cx4-xfps/207896 "2015-05-05T17:37:37Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![aparker1](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@aparker1](https://forums.developer.nvidia.com/u/aparker1)\
**Post date:** [May 5, 2015, 5:37pm UTC](https://forums.developer.nvidia.com/t/what-cabling-would-one-need-to-go-from-connectx-2-vpi-to-xfp-10gigabit-ethernet-with-cx4-xfps/207896/1 "2015-05-05T17:37:37Z")

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I’ve got a couple of ConnectX-2 and ConnectX VPI cards, and the QSFP to CX4 cables I purchased seem to not understand that the other side is 10Gigabit ethernet. What cabling would I need to make those ports understand that they’re connected to a 10GigE switch?

Current: (HCA) QSFP → CX4 (passive) CX4 → XFP (Force10 E600)

I’ve attempted the above with a variety of different card driver settings (on linux) and none of them work (inbox and mlnx\_ofed) - ibstatus always reports ‘state: 1: DOWN’ and ‘phys state: 3: Disabled’. I attempted to email support@mellanox, but since I don’t have an active service contract they referred me here.

Does anybody have a working ConnectX-2 VPI to XFP 10GbE setup? If so, what cables/adapters did you use?

TIA