371
•
Due to the limit on the total number of static ARP entries, some dynamic ARP entries might fail the
conversion.
•
To delete a static ARP entry converted from a dynamic one, use the
undo arp
ip-address
command.
Use the
reset arp all
command to delete all ARP entries or the
reset arp static
command to delete
all static ARP entries.
Configuration procedure
To configure ARP scanning and fixed ARP:
Step Command
1.
Enter system view.
system-view
2.
Enter VLAN interface view.
interface
interface-type interface-number
3.
Enable ARP automatic scanning.
arp scan
[
start-ip-address
to
end-ip-address
]
4.
Return to system view.
quit
5.
Enable fixed ARP.
arp fixup
Configuring ARP gateway protection
Configure this feature on interfaces not connected to a gateway to prevent gateway spoofing attacks.
When such an interface receives an ARP packet, it checks whether the sender IP address in the packet is
consistent with that of any protected gateway. If yes, it discards the packet. If not, it handles the packet
correctly.
Configuration guidelines
Follow these guidelines when you configure ARP gateway protection:
•
You can enable ARP gateway protection for a maximum of eight gateways on an interface.
•
Do not configure both the
arp filter source
and
arp filter binding
commands on an interface.
•
If ARP gateway protection works with ARP detection, MFF, and ARP snooping, ARP gateway
protection applies first.
Configuration procedure
To configure ARP gateway protection:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet interface
and Layer 2 aggregate interface
view.
interface
interface-type
interface-number
N/A.