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best practise to interconnect campus and DC on the same location

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  • 1.  best practise to interconnect campus and DC on the same location

    Posted May 24, 2022 11:44 AM
    Hi
    we are discussing internal the best practise of a design in case you have
    in campus
    2 cores (in active-active or active-standby)
    access switches connected to each core
    in DC 
    2 cores  (in active-active or active-standby)
    server switches connected to each core
    the question is how does the best practise describe you must interconnect these cores if they are on the same location.

    I am not able to find in the documentation of best practises but I always learned it must be with layer 3 links.
    Layer 3 because with layer 2 interconnects or even if you use mlag, if a loop or layer 2 issue happens on the campus it will extend on the DC and even STP protection will not help.
    With layer 3 interconnect this will remain on the campus and the DC (if possible to reach from outside) can continue to work.
    Are there any documents available to support this design please?
    thanks


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    Bart Verstegen
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