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> On Feb 25, 2020, at 18:34, Norman Jester <n...@jester.mx> wrote:
>
> I’m in the process of choosing hardware
> for a 30 story building. If anyone has experience with this I’d appreciate
> any tips.
>
> There are two fiber pairs running up the building riser. I need to put a POE
> switch on each floor using this fiber.
In my experience with retrofitting existing structures, if you have access to
the riser at each floor as it sounds like you do, you would typically drop in a
new duct, blow micro duct through it with a branch for each floor, have an MDF
or two In a utility spaces and them you have the ability to reconfigure the
fiber as necessary to meet your present and future needs.
You didn’t specify if the existing fiber is single or multi-mode however it is
unlikely that the was enough slack built into two fiber runs to make 30
additional splices so that approach seems dubious as a premise.
As you correctly surmise daisy chaining 30 switches is not an advisable network
design practice.
> The idea is to cut the fiber at each floor and insert a switch and daisy
> chain the switches together using one pair, and using the other pair as the
> failover side of the ring going back to the source so if one device fails it
> doesn’t take the whole string down.
>
> The problem here is how many switches can be strung together and I would not
> try more than 3 to 5. This is not something I typically do (stacking
> switches). I have fears of STP and/or RSTP issue stacking past Ethernet
> switch to switch limits (if they still exist??)
>
> Is there a device with a similar protocol as the old 3com (now HP IDF)
> stacking capability via fiber?
>
> I’d like to use something inexpensive as its to power ubiquiti wifi on each
> floor. Ideally if you know something I don’t about ubiquiti switches that
> can do this I’d appreciate knowing.
>
> Norman
>
>
