Anycast Gateways

Can anyone shed light of anycast gateways. Typically Ive seen each pair of leafs within a fabric configured with MCLAG and a different IP used for the gw address across each pair of leafs. However, how does Anycast gateways work?

Ive been unable to find much on Google. Only that it is only achieved when using VXLAN/EVPN. However, I can see that ACI provides the ability to provide Anycast gateways without the use of VXLAN.

In short, my question is, how do Anycast Gateways work, and is it possible to configure them upon a fabric without the use of VXLAN/EVPN?

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