Route Distinguisher operation

Question

Hi,
I need help with the operation of RD.
I Know that the RD (64 bits) is attached to the prefix when is send into the MP-BGP cloud to other PE?s, being converted in a VPNv4 packet.
My question is: What is the route decision process in the receiving PE?.
For example:
PE1 is configured to import routes with IMPORT RT 1:100 and RD 2:100.
To PE1 arrives 2 updates both with EXPORT RT 1:100 and for network 10.0.0.0 /24.
- (RD)2:200 - 10.0.0.0 /24
- (RD)2:300 - 10.0.0.0 /24
1- Both networks are inserted in the MP-BGP table? (I believe that yes).
2- What network is imported into the VRF, both, only one? (I don?t know)
Thanks for all.

Answer 1

I received some unicasts upon my last reply to this post. The confusion created
was, how will two paths be passed to the CE.
Well its quite evident that if the CE has only one physical path to the PE then it
cannot receive two paths. Only if the CE has two paths (dual homed) then only the CE
loadbalance or else the PE will do tha loadbalancing for the same end destination.
But to do that we have to use different RD values for the same routes from two different
PE's. So that we get the route till our PE in its MPBGP table and then we have to get
it into the forwarding table that is the VRF table by using maximum-paths ibgp 2.
Just wanted to clear the confusion. :-)
And to answer more crisply rather than generically to the original post,
so as to avoid confusion.
Q//
1- Both networks are inserted in the MP-BGP table?
A - Yes both the routes will be there in the MPBGP table as it wont be
filtered by your RR.
Can be verified by using "show ip bgp vpnv4 all"
Q//
2- What network is imported into the VRF, both, only one?
Both the routes would be installed in the CE VRF table by using maximum-paths ibgp 2.
Can be verified by using "show ip route vrf x"
HTH-Cheers,
Swaroop