[c-nsp] MPLS VPN Question about PE-CE - Private or Public IP?

[John Osmon]

On Tue, Aug 19, 2008 at 09:41:09PM -0400, Christian Koch wrote:
> a 64bit route distinguisher and the 32bit ip address are used to
> create vpnv4 address, which specifically solves the overlap problem

I don't think the overlap is the real issue:

> > Although I tend to be more fond of using public IP's because it's a
> > unique address space so you don't have to worry about overlapping IP
> > addresses on the customer's end and secondly there's no configuration
> > from the Service Provider's end should you need to remove the connection
> > from the VRF to conduct further testing from the Internet becuse the
> > connection is already using public IP's

Using non-RFC1918 address means you have a guaranteed unique identifier
for the interface.  The non-overlap issue is a side effect of having a
unique identifier.