[j-nsp] [EXT] MX routers and DAC cables?

[Chuck Anderson]

I've used SFP+ DACs on MX, EX and QFX without problems.  I have not tried QSFP DACs on MX, but they work on EX/QFX.

On Fri, Jun 12, 2020 at 01:39:11PM -0500, Chris Adams wrote:
> Is anybody using DAC cables on MX routers?  We have a customer with an
> MX10003 connected to EX4600 switches with 40G DAC cables (Juniper parts,
> not third-party).  Upon upgrading the router JUNOS to 18.2R3-S3, none of
> the interfaces with a DAC cable would come up on the router end.
> 
> JTAC's response was that no DAC cables are supported on any MX routers.
> 
> That seems a little odd to me... I thought DAC cables are a part of the
> various specs, so saying they're not supported is saying those aren't
> actually Ethernet ports to me.