Some good debugging:

start shell
vty fpc0
show qsfp list
show qsfp <id>




On Mon, Sep 29, 2014 at 10:16 AM, Darren O'Connor <[email protected]> wrote:
> I've got the very latest code on as it's in a lab D25
>
> I've got two 3rd party DACs and it's going from QFX5100 to QFX5100. Both have 
> the same issue. Same two cables in QSFP ports on the back of the 4300s works 
> perfectly fine.
>
> Date: Mon, 29 Sep 2014 08:25:38 -0600
> Subject: Re: [j-nsp] QFX5100 3rd party optic/DAC
> From: [email protected]
> To: [email protected]
> CC: [email protected]
>
> What version of code? D10 (frs) had some issues with some cables which is 
> resolved in more current versions.
> Also if this is 5100 to 4300 make sure you have auto negotiation turned off 
> on the 4300 (but that would probably fail with a juniper branded dac as well 
> so unlikely to be the issue).
> On Sep 29, 2014 6:43 AM, "Darren O'Connor" <[email protected]> wrote:
> Anyone having any luck with this? I've got a few QSFP DACs that work 
> perfectly fine on a 4300 stack, but the QFX5100 refuses to work with them. 
> Work fine with a Juniper branded DAC.
>
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