[j-nsp] Route target configuration for L2VPN route instance

[Monika M]

RFC 4761, Section 3.1.2: As it has been assumed that VPLSs are fully meshed,
a single Route
   Target RT suffices for a given VPLS V, and in effect that RT is the
   identifier for VPLS V.

But juniper allows configuring more than one route targets (See the
example below). But with the below configuration, if a L2VPN NLRI with route
target 100:3 is received, it does not associate the received NLRI to the
VPLS instance. Is it a bug in Juniper? In which scenario, we will need more
than one route target ?

instance-type vpls;
interface fe-0/3/1.0;
route-distinguisher 100:3;
vrf-target {
    target:100:3; --> Both import and export
    import target:100:5;
}
protocols {
    vpls {
        site-range 10;
        site vplsSiteA {
            site-identifier 6;
            interface fe-0/3/1.0;
        }
    }
}

Regards,
Monika