That is certainly the way it is for the 3200 and 4200
http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/task/configuration/uplink-module-ex3200-ex4200-sfp-plus-mode-setting-cli.html

However it seems the 3300 is a different beast, or at least that's what I 
hope!
From the datasheet on 
http://www.juniper.net/us/en/products-services/switching/ex-series/ex3300/#literature

"
Uplink
• Fixed 4-port uplinks which can be individually configured as GbE
  (SFP) or 10GbE (SFP+) ports.
"

I've yet to find documentation detailing exactly how you go about that though.

On Monday 27 February 2012 14:25:12 Nick Kritsky wrote:
> As far as I remember you have to explicitly select 10g or 1g mode on PIC
> level for EX uplink module. This automatically rules out any mixed mode
> setup.
>
> NK
>
> 2012/2/21 Timh Bergström <[email protected]>
>
> > On Tue, Feb 21, 2012 at 12:03 PM, Mike Williams
> >
> > <[email protected]> wrote:
> > > On Tuesday 21 February 2012 08:33:53 Jeff Wheeler wrote:
> > >
> > > The built in uplink ports in the EX3300. Do they support running 2 at
> >
> > 10Gb
> >
> > > (for VC) and 2 at 1Gb for regular ethernet?
> > > I'm sure I've seen it written that all four ports can be used at 10Gb,
> >
> > if true
> >
> > > that would support my belief mixed mode operation is supported too.
> >
> > Afaik two of the four 10Gb ports are pre-configured for VC, the other
> > two can be used for ethernet out of the box, or you can use one for VC
> > and three for ethernet or the other way round, no problems (at least
> > that's what the juniper SE told me when I bought mine).



-- 
Mike Williams
Senior Infrastructure Architect
Comodo CA Ltd
Office Tel Europe: +44 (0) 161 8747070
Fax Europe: +44 (0) 161 8771767

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