MPLS:multiprotocol lable switching
RD:route distinguisher, 64bit length. transform an 32bit IP add to 96bit vpnv4 address, so that it will be unique in the network even you use the same range of private ip address in your network.
RT:route target, 64bit BGP community. import and export functionality. can decide which route you want to send the traffic for.
the name of RT can be different, they are not related.
e.g: #ip vrf vpn1
#rd 10.1.1.1:1
#route-target import 1:1(can choose which one you wanna import)
#route-target export 1:1
#do sh ip vrf
#do sh ip bgp vpnv4 all
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