Whether you use Private or Public really does not matter.

The provider will create a specific VPN just for you and this will not have
any effect on the global routing table of your provider.
And even if it did, the whole idea of public networks are address  unique to
you on the public network so no one besides you should be using it.

Originally before the MPLS VPN came about, you had to use a public
address/networks to peer with your provider at layer 3(for example the
internet or similar), but by using rfc 2547 VPN, you are allowed to use
private networks (like your Frame Relay network) if you want to...

So kind of combining the positive features of both layer 2 and layer 3 VPN
technology.

- Paul


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