overlapping addresses in MPLS VPN

[mesuti]

I know that you can have overlapping addresses in a MPLS VPN and that route distiguisher is used for distiguishing them, by converting IPv4 to VPNv4.

My question is that if an IP range of a Branch A overlapps with IP range of branch B of the same VPN, How could a host in Branch A ping any host in Branch B, if they are in a same subnet? I mean, how could the router (CE) know to forward it to PE ? if the range is directly connected (to CE).

I will apreciate any help

[ns]

Within a VPN the normal IP routing rules apply, eg. if you have 2 networks that overlap within a VPN you need to use NAT in one of the CE routers.

Hth,

Niels

[mesuti]

In books that I read about this, there wasn't any explaination about NAT and that's why it was not clear to me, so thank you for your help.