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

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

ip arp inspection trust

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.
This command is available only if your switch is running the IP services feature set.
Syntax Description
This command has no arguments or keywords.
Defaults The interface is untrusted.
Command Modes Interface configuration
Command History Release
12.2(53)SE2
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.
OL-29704-01
ip arp inspection trust
no ip arp inspection trust
Modification
This command was introduced.
Catalyst 3750-X and 3560-X Switch Command Reference
ip arp inspection trust
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