The following example shows how to configure strict unicast RPF for IPv4 packets on a Cisco Nexus 9300 platform switch: no system urpf disable interface Ethernet2/2 ip address 172.23.231.240/23 ip verify unicast source reachable-via rx Reference: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7- x/security/configuration/guide/b_Cisco_Nexus_9000_Series_NX- OS_Security_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX- OS_Security_Configuration_Guide_7x_chapter_010111.html