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Enabling arp black hole routing, Displaying and maintaining arp source suppression, Network requirements – H3C Technologies H3C WX3000E Series Wireless Switches User Manual

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Enabling ARP black hole routing

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enable ARP black hole
routing.

arp resolving-route enable

Optional.
The aging time of ARP black hole
routes is 25 seconds by default.

Displaying and maintaining ARP source suppression

Task Command

Remarks

Display ARP source suppression
configuration information.

display arp source-suppression [ |

{ begin | exclude | include }
regular-expression ]

Available in any view

Unresolvable IP attack protection configuration example

Network requirements

As shown in

Figure 140

, a LAN contains two areas: an R&D area in VLAN 10 and an office area in

VLAN 20. The two areas connect to the gateway (AC) through an access switch.
A large number of ARP requests with the same source address are detected in the office area and are

considered as an unresolvable IP attack. To defend against the attack, configure ARP source suppression
and ARP black hole routing.

Figure 140 Network diagram

IP network

Gateway

AC

R&D

Office

VLAN 10

VLAN 20

Client 1

Client 2

Client 3

Client 4

ARP attack protection

AP 1

AP 2