[FROG] How does FRR turn off BGP VPNV4 prefix filtering

hello,i want to use frr make a mpls vpn network(option B),at the asbr,i should turn off the VPNV4 prefix filtering,but i can not find which command is it.i know in cisco router,it is "no bgp default route-target filter",can you tell me which command is it in frr. thank you very much