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

[Tim Franklin]

On Wed, August 20, 2008 9:13 am, David Granzer wrote:

> You can use private IP's and 'save' your public IP space, but then you
> can find case (maybe) when you will overlap with private IP's used in
> customer network.

Assuming you want to manage the CE in any way, this *will* bite you.  In a
previous life, I've spent a lot of time and pain, both engineering-wise
and customer-facing trying to dance around this conflict after making an
initial misguided decision to use private addressing for PE-CE links (and
CE loopbacks, in this particular case).

This time around, the MPLS VPN product I'm working on is using public
address space for everything.  Unique public addresses for the management
loopbacks, and unique-within-a-VPN addresses for the WAN links, the latter
saving space by re-using the same WAN address block over and over again
for different customer.

Regards,
Tim.