We're in the process of designing a L3 BGP-EVPN network for our two datacenters. The plan is separate spine switches in each datacenter and then have an interconnect between datacenters, as well as peering between the datacenter and our campus core as well as a L2 LAG from the old L2 legacy networks into the new, using VXLAN to deliver them until the servers can be re-ip'd.
My question lies in the necessity of a border leaf. It seems a lot of designs use a dedicated pair of leafs for the interconnect between datacenters, as well as the peering to the internet/core/etc.
We are on a limited budget so what I'm looking for is a compelling reason or argument for doing this as opposed to just attaching those connections directly to the spine. Why should I use a border leaf?
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