VC port carries inter switch traffic (potentially large) and also some
state replication traffic. (not very much)

The answer mostly depends on how much your inter-switch traffic are.

On Tue, Feb 14, 2017 at 3:17 AM, Valentini, Lucio
<lucio.valent...@siag.it> wrote:
> Hi there,
>
> I was wondering what speed  of VC port is necessary if I have 10 Gbps ports 
> as traffic ports on a VC with EX4300; would VC ports at 10 Gbps be enough or 
> do I need 40 Gbps ports? The 2 switches will be over 100 meters apart from 
> each other, so I need to use the uplink module ports to make the VC. But the 
> EX4300-32F has also an 40 GbE additional  uplink module, which could be used 
> if necessary.
>
> Also, if I need 40 GbE ports to make the VC, do I need single mode fibers to 
> cover 100 meters or is multimode sufficient? I found in some documentation 
> that with 40 GbE, single mode is necessary for distances over 150 meters: In 
> this case I really have to be careful about the measurement of the distance.
>
> Thanks for your thoughts
>
> Regards
>
> Lucio
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