Ip Arp Inspection Validate - Cisco Catalyst 3750 Command Reference Manual

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

ip arp inspection validate

Use the ip arp inspection validate global configuration command on the switch stack or on a standalone
switch to perform specific checks for dynamic Address Resolution Protocol (ARP) inspection. Use the
no form of this command to return to the default settings.
This command is available only if your switch is running the enhanced multilayer image (EMI).
Syntax Description
src-mac
dst-mac
ip
Defaults No checks are performed.
Command Modes
Global configuration
Command History Release
12.2(20)SE
Usage Guidelines
You must specify at least one of the keywords. Each command overrides the configuration of the
previous command; that is, if a command enables src-mac and dst-mac validations, and a second
command enables IP validation only, the src-mac and dst-mac validations are disabled as a result of the
second command.
If you first specify the src-mac keyword, you also can specify the dst-mac and ip keywords. If you first
specify the ip keyword, no other keywords can be specified.
The no form of the command disables only the specified checks. If none of the options are enabled, all
checks are disabled.
78-16181-03
ip arp inspection validate {[src-mac] [dst-mac] [ip]}
no ip arp inspection validate [src-mac] [dst-mac] [ip]
Check 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.
Check 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.
Check 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. Target IP
addresses are checked only in ARP responses.
Modification
This command was introduced.
ip arp inspection validate
Catalyst 3750 Switch Command Reference
2-125