Define Trusted and Untrusted Interfaces for DAI

You can define the trusted and untrusted interfaces under Dynamic ARP Inspection (DAI).

About this task

An interface is untrusted by default.

Access global configuration mode.
```
device# configure terminal
```
Access interface configuration mode.
```
device(config)# interface ethernet 2/3
```
To define an interface as trusted, run the ip arp inspection trust command.
```
device(conf-if-eth-2/3)# ip arp inspection trust
```
To define a trusted interface as untrusted, run the no ip arp inspection trust command.
```
device(conf-if-eth-2/3)# no ip arp inspection trust
```

The following example defines a port-channel interface as trusted.

device# configure terminal
device(config)# interface port-channel 200
device(config-Port-channel-200)# ip arp inspection trust

The following example defines a port-channel interface as untrusted.

device# configure terminal
device(config)# interface port-channel 200
device(config-Port-channel-200)# no ip arp inspection trust