Ip Arp Inspection Trust - Cisco Catalyst 3560-X Command Reference Manual

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ip arp inspection trust

Syntax Description

Command Modes

Command History

Usage Guidelines

Catalyst 3750-X and 3560-X Switch Command Reference

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Use the ip arp inspection trust interface configuration command on the switch stack or on a standalone

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.

ip arp inspection trust

no ip arp inspection trust

This command is available only if your switch is running the IP services feature set.

This command has no arguments or keywords.

The interface is untrusted.

Interface configuration

Modification

This command was introduced.

The switch does not check ARP packets that it receives on the trusted interface; it simply forwards the

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.

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.

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