Hi, our current situation: we got /22 subnet, which we are advertising from DC in city A to internet. We also have DC in city B, which is just connected by dedicated fiber to city A.
We are using 2x/24 in DC A and 2x/24 in DC B from our /22 subnet.
Right now we are in process of ordering new internet connection to DC B (different isp from DC A)
My plan is advertise 4x /24 from DC A and 4x/24 from DC B and set "as prepend" on both DC's for prefixes which are used on another DC. In this way, traffic for /24 used on DC A should go directly to DC A and only if our upstream on DC A fail, it will go to DC B and via our connection between cities to DC A, which is desired state.
Is it valid thinking? Never advertised one prefix from multiple sources :) Thanks!
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