Managed LAN Solution Design Topology Diagram Inquiry

Hey Guys,

Just curious does anyone have any managed services LAN design diagram documents I googled but it`s all over the place.

I think the standard 2/3 tier design is for the customer but the MSP side of things is what I`m really interested in from a design perspective, like how do they manage all of those customers LAN ( I presume VRF`s are used to segment customers LAN`s)

Thanks