Enable ARP Guard on an Interface or Port-channel

1. Access global configuration mode.
   

   device# configure terminal

2. Create an ACL to enable ARP Guard.
   

   device(config)# mac access-list extended arp_guard_enable_1

   This example creates an ACL named arp_guard_enable_1.
3. In the ACL, create the rules that you want to implement.
   

   device(conf-macl-ext)# permit host 0014.2211.1111 any vlan 100 arp arp-guard
   device(conf-macl-ext)# permit host 0014.2211.1112 any vlan 101 arp arp-guard
   device(conf-macl-ext)# deny any any arp
   device(conf-macl-ext)# permit any any
   

4. Access interface configuration mode.
   

   device(conf)# interface ethernet 1/2

5. Access Layer 2 mode.
   

   device(conf-if-eth-1/2)# switchport

6. Specify the ACL and the in direction.
   

   device(conf-if-eth-1/2)# mac access-group arp_guard_enable_1 in

The following example summarizes the commands in this procedure.

device# configure terminal
device(config)# mac access-list extended arp_guard_enable_1
device(conf-macl-ext)# permit host 0014.2211.1111 any vlan 100 arp arp-guard
device(conf-macl-ext)# permit host 0014.2211.1112 any vlan 101 arp arp-guard
device(conf-macl-ext)# deny any any arp
device(conf-macl-ext)# permit any any
device(conf)# interface ethernet 1/2
device(conf-if-eth-1/2)# switchport
device(conf-if-eth-1/2)# mac access-group arp_guard_enable_1 in