CISC-L2-000150 - The Cisco switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.

Warning! Audit Deprecated

This audit has been deprecated and will be removed in a future update.

View Next Audit Version


DAI intercepts ARP requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the packet to the appropriate destination. Invalid ARP packets are dropped and logged.

DAI determines the validity of an ARP packet based on valid IP-to-MAC address bindings stored in the DHCP snooping binding database. If the ARP packet is received on a trusted interface, the switch forwards the packet without any checks. On untrusted interfaces, the switch forwards the packet only if it is valid.


Configure the switch to have DAI enabled on all user VLANs as shown in the example below:

SW2(config)#ip arp inspection vlan 2,4-8,11

See Also

Item Details

References: CAT|II, CCI|CCI-002385, Rule-ID|SV-220635r863247_rule, STIG-ID|CISC-L2-000150, STIG-Legacy|SV-110241, STIG-Legacy|V-101137, Vuln-ID|V-220635

Plugin: Cisco

Control ID: d176362f6cdf853b693ca6ed52886780fd2a7a33de4d41a6d8fb2e5b3768fe76