> Brandon Ewing <nicot...@warningg.com> wrote:
>
>> David Bass wrote:
>> The n2k ToR is not a great design for user or storage interfaces if most of
>> your traffic is east/west. It is great as a low cost ilo/drac/choose your
>> oob port, or if most of your traffic is north/south. Biggest thing to
>> remember is that it is not a switch, and has limitations such as not
>> connecting other switches to it. Like anything else you have to understand
>> the product so that you don't engineer something that it wasn't designed to
>> do.
>
> And remember -- The Nexus 2K performs absolutely ZERO local switching -- all
> frames received from client ports are just copied to the upstream device, so
> it can handle the frame/packet forwarding logic.
>
What this really does is force you to consider how much of your East-West is
rack-local, versus off rack.
Rack-local-heavy hurts as badly as off rack, with FEX.
If you want to / can localize E/W tighter than that then you want real TOR
switching. If the average E-W is cross rack then the FEX are performance
equivalent. For random distributions this comes at a few racks. For
intentional distributions it's probably better to TOR switch from day one.
George William Herbert
Sent from my iPhone
