Chapter 8
| General Security Measures
ARP Inspection
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ip arp inspection This command enables ARP Inspection globally on the switch. Use the no form to
disable this function.
Syntax
[no] ip arp inspection
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
â—† When ARP Inspection is enabled globally with this command, it becomes active
only on those VLANs where it has been enabled with the ip arp inspection vlan
command.
â—† When ARP Inspection is enabled globally and enabled on selected VLANs, all
ARP request and reply packets on those VLANs are redirected to the CPU and
their switching is handled by the ARP Inspection engine.
â—† When ARP Inspection is disabled globally, it becomes inactive for all VLANs,
including those where ARP Inspection is enabled.
â—† When ARP Inspection is disabled, all ARP request and reply packets bypass the
ARP Inspection engine and their manner of switching matches that of all other
packets.
â—† Disabling and then re-enabling global ARP Inspection will not affect the ARP
Inspection configuration for any VLANs.
â—† When ARP Inspection is disabled globally, it is still possible to configure ARP
Inspection for individual VLANs. These configuration changes will only become
active after ARP Inspection is globally enabled again.
show ip arp inspection
statistics
Shows statistics about the number of ARP packets
processed, or dropped for various reasons
PE
show ip arp inspection vlan Shows configuration setting for VLANs, including ARP
Inspection status, the ARP ACL name, and if the DHCP
Snooping database is used after ACL validation is
completed
PE
Table 60: ARP Inspection Commands (Continued)
Command Function Mode
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