H3C Technologies H3C S12500-X Series Switches - Manual (Page 242)

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• To delete a specific static ARP entry converted from a dynamic one, use the undo arp ip-address
[ vpn-instance-name ] command. Use the reset arp all command to delete all ARP entries or the
reset arp static command to delete all static ARP entries.
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Configuration procedure
To configure ARP automatic scanning and fixed ARP:
Step Command
1. Enter system view. system-view
2. Enter Layer 3 Ethernet interface view or
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
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Configuring ARP gateway protection
Configure this feature on interfaces not connected with 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.
317B
Configuration guidelines
When you configure ARP gateway protection, follow these guidelines:
• 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, ARP gateway protection applies first.
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Configuration procedure
To configure ARP gateway protection:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Layer 2 Ethernet interface
view.
interface interface-type
interface-number
N/A
3. Enable ARP gateway protection
for the specified gateway.
arp filter source ip-address
By default, ARP gateway
protection is disabled.