Arp Detection Configuration Example I - 3Com 4500G Family Configuration Manual

To do...
Clear the ARP detection
statistics

ARP Detection Configuration Example I

Network requirements
Enable DHCP snooping on Switch B. Enable ARP detection for VLAN 10 to allow only packets from
valid clients to pass.
Configure Host A and Host B as DHCP clients.
Figure 1-1 Network diagram for ARP detection configuration
Configuration procedure
1) Add all the ports on Switch B into VLAN 10, and configure the IP address of VLAN-interface 10 on
Switch A (the configuration procedure is omitted).
2) Configure a DHCP server (the configuration procedure is omitted).
3) Configure Host A and Host B as DHCP clients (the configuration procedure is omitted).
4) Configure Switch B
# Enable DHCP snooping.
<SwitchB> system-view
[SwitchB] dhcp-snooping
[SwitchB] interface gigabitethernet 1/0/1
[SwitchB-GigabitEthernet1/0/1] dhcp-snooping trust
[SwitchB-GigabitEthernet1/0/1] quit
# Enable ARP detection for VLAN 10.
[SwitchB] vlan 10
[SwitchB-vlan10] arp detection enable
# Configure the upstream port as a trusted port and the downstream ports as untrusted ports (a port is
an untrusted port by default).
[SwitchB-vlan10] interface gigabitethernet 1/0/1
[SwitchB-GigabitEthernet1/0/1] arp detection trust
Use the command...
reset arp detection statistics [ interface
interface-type interface-number ]
1-10
Remarks
Available in user view