Re: Which method easy to leak routes between two VRF?

Yes vrf-target export and vrf-target import overrides vrf-target target:x:x

Please use vrf-import  and vrf-export instead of vrf-target import and vrf-target export, using this you can use multiple RT's

for import and export.

Only difference is you have to do via policy.

An example for vrf-import

routing-instances SITE-1 vrf-import import-vpn-A

policy-options{
policy-statement import-vpn-a {
term 1 {
from {
protocol bgp ; <<<< THIS IS always bgp as vrf routes are imported from bgp.l3vpn.0 
community vpn-a;
}
then {
accept;
}

}

}
community vpn-a member target:7777:1111;
community vpn-a member target:4:4;

An example for vrf-export

routing-instances SITE-1 vrf-export export-vpn-A

If BGP is the PE-CE protocol

 policy-options{
policy-statement export-vpn-a {
term 1 {
from {
protocol [bgp direct];
}

then 

{
community add vpn-a;

}

}

}

If OSPF is the PE-CE protocol

 policy-options{
policy-statement export-vpn-a {
term 1 {
from {
protocol [ospf direct];
}

then 

{
community add vpn-a;

}

}

}

community vpn-a member target:7777:1111;
community vpn-a member target:4:4;

One of these targets can be your route-leak target(common between the leaked instances) and the other can be the target specific to the particular vrf....

Please rever back if you face any issues