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This example shows how to configure source mac validation. Packets are dropped and an error message may be generated when the source address in the Ethernet header does not match the sender hardware address in the ARP body.
SwitchB# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SwitchB(config)# ip arp inspection validate src-mac
SwitchB(config)# exit
SwitchB# show ip arp inspection vlan 100
Source Mac Validation : Enabled
Destination Mac Validation : Disabled
IP Address Validation : Disabled
Vlan Configuration Operation ACL Match Static ACL
---- ------------- --------- --------- ----------
100 Enabled Active
Vlan ACL Logging DHCP Logging
---- ----------- ------------
100 Deny Deny
SwitchB#
1w2d: %SW_DAI-4-INVALID_ARP: 9 Invalid ARPs (Req) on Gi3/31, vlan
100.([0002.0002.0002/170.1.1.2/0001.0001.0001/170.1.1.1/02:30:24 UTC Fri Feb 4 2005])