Dynamic ARP Inspection
26-26 Configuring Security Features
Dynamic ARP Inspection Configuration
set arpinspection vlan 10
set arpinspection trust port ge.1.1 enable
Routing Example
The following example configures DHCP snooping and dynamic ARP inspection in a routing
environment using RIP. The example configures two interfaces on the switch, configuring RIP on
both interfaces, assigning each to a different VLAN, and then enabling DHCP snooping and
dynamic ARP inspection on them:
• Interface ge.1.1, which is connected to a remote DHCP server, on VLAN 192
• Interface ge.1.2, which is connected to DHCP clients, on VLAN 10
In addition, the default VLAN, VLAN 1, is also enabled for DHCP snooping and dynamic ARP
inspection.
Since the DHCP server is remote, the switch has been configured as a DHCP relay agent (with the
ip helper-address command), to forward client requests to the DHCP server. Therefore, MAC
address verification is disabled (with the set dhcpsnooping verify mac-address disable
command) in order to allow DHCP RELEASE packets to be processed by the DHCP snooping
functionality and client bindings removed from the bindings database
Router Configuration
router
enable
configure
interface vlan 10
no shutdown
ip address 10.2.0.1 255.255.0.0
ip helper-address 192.168.0.200
ip rip send version 2
ip rip receive version 2
ip rip enable
exit
interface vlan 192
no shutdown
ip address 192.168.0.1 255.255.255.0
ip rip send version 2
ip rip receive version 2
ip rip enable
exit
router rip
exit
T
Note: This example applies only to platforms that support routing.
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