1) Case 1: Assuming both the routes belong to the same VPN the PE1 will pass on both the routes to the directly connected CE, as it see both the routes as two different routes, and if the CE is configured to load balance it will load balance over these two paths.
2) Case 2: If they belong to two different VPN's then you RT numbering is wrong, as the traffic will be blackholed. As just different RD numbers wont prevent the route being imported into a certain VPN site.
As the import and export is totally goverened only by RT. RD takes care of keeping the route unique across.
Route Distinguisher (RD) is only used to make the routes unique within the provider network (MP-BGP) it is not used once those routes are put into a VRF and sent to the customer. RD is added to a route when it is advertised to another PE via MP-BGP. It is then removed from the route by the receiving PE when it is placed into the VRF.
Route Target (RT) is an extended community attribute and this is what is actually used to determine which routes actually get into a VRF. Routes will only be placed in a VRF if the route has an RT value (ext community) attribute on it that matches the import value configured on the VRF. The export value configured on the VRF is the extcomm attribute that is added to the route when it is advertised from the VRF. If a PE has no VRFs configured on it with import RT values matching an of the RT attributes on the routes, then the route is silently discarded when recieved by the PE.
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