Cisco 7604 User Manual

38-12
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 38 Configuring Dynamic ARP Inspection
Configuring DAI
• These are the additional validations:
– dst-mac—Checks the destination MAC address in the Ethernet header against the target MAC
address in ARP body. This check is performed for ARP responses. When enabled, packets with
different MAC addresses are classified as invalid and are dropped.
– ip—Checks the ARP body for invalid and unexpected IP addresses. Addresses include 0.0.0.0,
255.255.255.255, and all IP multicast addresses. Sender IP addresses are checked in all ARP
requests and responses, and target IP addresses are checked only in ARP responses.
– src-mac—Checks the source MAC address in the Ethernet header against the sender MAC
address in the ARP body. This check is performed on both ARP requests and responses. When
enabled, packets with different MAC addresses are classified as invalid and are dropped.
This example shows how to enable src-mac additional validation:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# ip arp inspection validate src-mac
Router(config)# do show ip arp inspection | include abled$
Source Mac Validation : Enabled
Destination Mac Validation : Disabled
IP Address Validation : Disabled
This example shows how to enable dst-mac additional validation:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# ip arp inspection validate dst-mac
Router(config)# do show ip arp inspection | include abled$
Source Mac Validation : Disabled
Destination Mac Validation : Enabled
IP Address Validation : Disabled
This example shows how to enable ip additional validation:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# ip arp inspection validate ip
Router(config)# do show ip arp inspection | include abled$
Source Mac Validation : Disabled
Destination Mac Validation : Disabled
IP Address Validation : Enabled
This example shows how to enable src-mac and dst-mac additional validation:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# ip arp inspection validate src-mac dst-mac
Router(config)# do show ip arp inspection | include abled$
Source Mac Validation : Enabled
Destination Mac Validation : Enabled
IP Address Validation : Disabled
This example shows how to enable src-mac, dst-mac, and ip additional validation:
Router# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)# ip arp inspection validate src-mac dst-mac ip
Router(config)# do show ip arp inspection | include abled$
Source Mac Validation : Enabled
Destination Mac Validation : Enabled
IP Address Validation : Enabled

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English