You then bind these vrf profiles to sites and configure interfaces with the appropriate vrf Normally you need multiple vrs to have a separate set of routes which you do not want to share between vrs, also you can configure different routing types for different interfaces When traffic enters the interface, it only considers destinations that have the same vrf locally or across the fabric.
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Site a has border switch that sending prefixes over ebgp peering and multiple ebgp peerings for separate vrfs to the cisco routers and that cisco router connected via dark fiber with site b fw (lets say palo alto)
Network segmentation is a design strategy that divides a wan into smaller, isolated networks, or segments.
In the cisco world, a virtual router is essentially a vrf, or a separate table with its own policies, etc If multiple vrfs exist on a device, there is no communication between hosts on those different vrfs unless the traffic is passed to another l3 device, or some kind of export config is used. Personally it sounds like you are simply utilizing vrfs to force the traffic through the firewall for inspection, and that theese networks aren't really 'seperate' but rather different logical zones in your network. Virtual routing and forwarding (vrf) enables segmentation of network traffic
