7.10. Route Targets

The EVPN route MAY carry one or more Route Target (RT) attributes. RTs may be configured (as in IP VPNs) or may be derived automatically.

If a PE uses RT Constraint, the PE advertises all such RTs using RT Constraints per [RFC4684]. The use of RT Constraints allows each EVPN route to reach only those PEs that are configured to import at least one RT from the set of RTs carried in the EVPN route.