H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 349)

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Step Command Remarks
6. Configure the port as a trusted port
on which ARP detection does not
apply.
arp detection trust
Optional.
A port is an untrusted port by
default.
NOTE:
•
At least the static IP source guard binding entries, DHCP snooping entries, or 802.1X security entries
used for user validity check must be available. Otherwise, ARP packets received from ARP untrusted
ports will be discarded, except for the ARP packets whose sender MAC address is an OUI MAC address
when voice VLAN is enabled.
• You must specify a VLAN for an IP source guard binding entry. Otherwise, no ARP packets can match
the IP source guard binding entry.
Configuring ARP packet validity check
Perform this task to enable validity check for ARP packets received on untrusted ports and specify the
following objects to be checked:
• src-mac: Checks whether the sender MAC address in the message body is identical to the source
MAC address in the Ethernet header. If they are identical, the packet is forwarded. Otherwise, the
packet is discarded.
• dst-mac: Checks the target MAC address of ARP replies. If the target MAC address is all-zero,
all-one, or inconsistent with the destination MAC address in the Ethernet header, the packet is
considered invalid and discarded.
• ip: Checks the sender and target IP addresses of ARP replies, and the sender IP address of ARP
requests. All-zero, all-one, or multicast IP addresses are considered invalid and the corresponding
packets are discarded.
To configure ARP packet validity check:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter VLAN view. vlan vlan-id N/A
3. Enable ARP detection. arp detection enable Disabled by default.
4. Return to system view. quit N/A
5. Enable ARP packet validity check
and specify the objects to be
checked.
arp detection validate
{ dst-mac | ip | src-mac } *
Not specified by default.
6. Enter Ethernet interface view.
interface interface-type
interface-number
N/A
7. Configure the port as a trusted
port on which ARP detection does
not apply.
arp detection trust
Optional.
A port is an untrusted port by
default.