The value of vRtrIfUrpfSelectedVprnsOnly enables selective uRPF checking. When the value of vRtrIfUrpfSelectedVprnsOnly is 'true', packets that are associated to a VPRN will be subjected to the uRPF treatment configured for this interface if the associated VPRN has 'TIMETRA-SERV-MIB::svcNetIngUrpfCheckState' set to 'true'. The uRPF treatment for this interface is configured with the objects vRtrIfuRPFCheckState, vRtrIfuRPFCheckMode, vRtrIfuRPFIgnoreDefault for IPv4 packets, and vRtrIfIpv6uRPFCheckState, vRtrIfIpv6uRPFCheckMode, and vRtrIfIpv6uRPFIgnoreDefault for IPv6 packets. When the value of vRtrIfUrpfSelectedVprnsOnly is 'false', uRPF check configuration will be done for all packets associated with a VPRN, regardless of the value of 'TIMETRA-SERV-MIB::svcNetInguRPFCheckState' and regardless of the uRPF configuration for this interface. The value of vRtrIfUrpfSelectedVprnsOnly does not affect uRPF checking on packets ingressing a VPRN directly through a SAP or SDP binding associated with a service interface; uRPF checking on those packets is controlled by the value of the object vRtrIfuRPFCheckState of the service interface. Setting the value of vRtrIfUrpfSelectedVprnsOnly to 'true' is only allowed if the value of the vRtrIfType object in the corresponding row in the vRtrIfTable is equal to 'network'.