Load Sharing in MPLS VPN with Route Reflector

No matter what I did according to this Cisco article, I simply can't do load-sharing among the PE routers within our enterprise MPLS VPN. The central Route Reflector (RR) simply refuses to send more than 1 identical route, even though I have multiple PE routers attached to that route.

Subsequently, I come across this excellent MPLS VPN blog. It explains that there is no way to change the route reflector behavior.  The workaround is to simply assign different Route Distinguisher (RD) values for the same VRF on different routers. To enable route propagation, ensure that you export and import common Route Target (RT) across the PE routes. Finally, enable "maximum-paths eibgp " on each vpnv4 address family under the router bgp process, so as to inject more than one bgp route into the routing table.

And it works magic!

Example configuration according to above diagram

On Router PE A

ip vrf VRF_A

  rd 65001:101

 route-target both 65001:100

  .....

router bgp 65001

  address-family ipv4 vrf VRF_A

  maximum-paths eibgp 4

On Router PE B

ip vrf VRF_A

  rd 65001:102

 route-target both 65001:100

.....

router bgp 65001

  address-family ipv4 vrf VRF_A

  maximum-paths eibgp 4

On Router PE C

ip vrf VRF_A

  rd 65001:101

 route-target both 65001:100

  .....

router bgp 65001

  address-family ipv4 vrf VRF_A

  maximum-paths eibgp 4

On Router PE D

ip vrf VRF_A

  rd 65001:102

 route-target both 65001:100

.....

router bgp 65001

  address-family ipv4 vrf VRF_A

  maximum-paths eibgp 4