3-9
z If both the ARP detection based on specified objects and the ARP detection based on snooping
entries/802.1X security entries/static IP-to-MAC bindings are enabled, the former one applies first,
and then the latter applies.
z Before enabling ARP detection based on DHCP snooping entries, make sure that DHCP snooping
is enabled.
z Before enabling ARP detection based on 802.1X security entries, make sure that 802.1X is
enabled and the 802.1X clients are configured to upload IP addresses.
Displaying and Maintaining ARP Detection
To do… Use the command… Remarks
Display the VLANs enabled
with ARP detection
display arp detection
Available in any view
Display the ARP detection
statistics
display arp detection statistics [ interface
interface-type interface-number ]
Available in any view
Clear the ARP detection
statistics
reset arp detection statistics [ interface
interface-type interface-number ]
Available in user view
ARP Detection Configuration Example I
Network requirements
z Enable DHCP snooping on Switch B. Enable ARP detection for VLAN 10 to allow only packets from
valid clients to pass.
z Configure Host A and Host B as DHCP clients.
Figure 3-1 Network diagram for ARP detection configuration
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