Ip Arp Inspection Trust - Cisco Catalyst 3750 Metro Command Reference Manual

ip arp inspection trust

ip arp inspection trust
Use the ip arp inspection trust interface configuration command on the switch to configure an interface
trust state that determines which incoming Address Resolution Protocol (ARP) packets are inspected.
Use the no form of this command to return to the default setting.
This command is available only if your switch is running the enhanced multilayer image (EMI).
Syntax Description
This command has no arguments or keywords.
Defaults The interface is untrusted.
Command Modes Interface configuration
Command History Release
12.2(25)EY
Usage Guidelines The switch does not check ARP packets that it receives on the trusted interface; it simply forwards the
packets.
For untrusted interfaces, the switch intercepts all ARP requests and responses. It verifies that the
intercepted packets have valid IP-to-MAC address bindings before updating the local cache and before
forwarding the packet to the appropriate destination. The switch drops invalid packets and logs them in
the log buffer according to the logging configuration specified with the ip arp inspection vlan logging
global configuration command.
Examples
This example shows how to configure a port to be trusted:
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# ip arp inspection trust
You can verify your setting by entering the show ip arp inspection interfaces interface-id privileged
EXEC command.
Catalyst 3750 Metro Switch Command Reference
2-138
ip arp inspection trust
no ip arp inspection trust
Modification
This command was introduced.
Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
OL-9645-10