> On 2/25/20 6:32 PM, Norman Jester 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. > > 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.
Yeah… I’d regenerate every five L2 devices as well. Which just means going up
to L3 periodically. Would it work for you to use the first pair for
daisy-chaining switches on each floor that’s not a multiple of five, and then
put the switches on the floors that are multiples of five into router mode,
with a switch-group facing their own floor, but routed ports facing other
floors? Then use the second pair as an “express” lane between the exit, floor
10, and floor 20, to keep L3 hop-sounds down and provide some redundancy?
-Bill
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