MPLS provide a VPN service by emulating the dedicated point to point links.
you have 2 options:
either you go for (Overlay Model) or (Peer to peer model).
The Overlay Model is basically binds your layer-2 circuit and doesnt participate in the routing but this harder to provision besides Scalability the advantage is more Secure but not scalable.
The Peer to peer Model provides more control by participating in the layer-3 routing and easier to provision and more Scalable.
Since your Sites are connected via dedicated (Point to point) Links, I would recommend you for Peer to peer model, By using this model, you can replace those point to point links to reduce cost and gain better control of the traffic, You can also provision the links easily.
You should direct your research about the Technology it self first, why MPLS? and what benefit I would have? what is required interms of hardware and software at last...
About the vendors, The mainly 2 Vendors in the Market nowadays are (Juniper & Cisco) , having your budget calculated , besides the facilities you are going to get from each vendor includin performance should be in plann. But its not Only price, there is a lot of items should be taken into consideration.
Regarding the BGP, You will lastly find BGP is necessary to carry the VPNv4 or the Labeled VPNv6 prefixes beides Multicast.
The MP-BGP is designed to carry additional information in its BGP update includes (RT Extended Communities) + (Labeled VPNv4 Routes) + (Labeled VPNv6 routes) + (Multicasdt MDT default , Mdt data ) MDT SAFI=128 and MDT AFI=1 . Thats why its a must.
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