Snooping and Inspecting Traffic 785
Configuring Dynamic ARP Inspection
Beginning in Privileged EXEC mode, use the following commands to
configure DAI settings on the switch.
Command Purpose
configure Enter global configuration mode.
ip arp inspection vlan
vlan-range [logging]
Enable Dynamic ARP Inspection on a single VLAN or a
range of VLANs. Use the logging keyword to enable
logging of invalid packets.
ip arp inspection
validate {[src-mac] [dst-
mac] [ip]}
Enable additional validation checks like source MAC
address validation, destination MAC address validation, or
IP address validation on the received ARP packets.
Each command overrides the configuration of the
previous command. For example, if a command enables
source MAC address and destination validations and a
second command enables IP address validation only, the
source MAC address and destination MAC address
validations are disabled as a result of the second
command.
•
src-mac
—
For validating the source MAC address of an
ARP packet.
•
dst-mac
—
For validating the destination MAC address of
an ARP packet.
•
ip
—
For validating the IP address of an ARP packet.
arp access-list
acl-name
Create an ARP ACL with the specified name (1–31
characters) and enter ARP Access-list Configuration mode
for the ACL.
permit ip host
sender-ip
mac host
sender-mac
Configure a rule for a valid IP address and MAC address
combination used in ARP packet validation.
•
sender-ip
— Valid IP address used by a host.
•
sender-mac
—Valid MAC address in combination with
the above sender-ip used by a host.
exit Exit to Global Config mode.
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