Configuring Arp Restricted Forwarding; Displaying And Maintaining Arp Detection; Arp Detection Configuration Example 1 - HP 12500 Series Configuration Manual

Configuring ARP restricted forwarding

ARP restricted forwarding controls the forwarding of ARP packets that are received on untrusted ports
and have passed ARP detection as follows:
If the packets are ARP requests, they are forwarded through the ARP-trusted ports.
•
If the packets are ARP responses, they are forwarded according to their destination MAC address.
•
If no match is found in the MAC address table, they are forwarded through the ARP-trusted ports.
Before performing the following configuration, make sure you have configured the arp detection enable
command.
To enable ARP restricted forwarding:
Step
1. Enter system view.
2. Enter VLAN view.
3. Enable
forwarding.

Displaying and maintaining ARP detection

Task
Display the VLANs enabled
with ARP detection.
Display the ARP detection
statistics.
Clear the ARP detection
statistics.

ARP detection configuration example 1

Network requirements
As shown in
ARP detection for VLAN 10 to allow only packets from valid clients to pass. Configure Host A and Host
B as local 802.1X access users.
ARP restricted
Command
display arp detection [ | { begin | exclude |
include } regular-expression ]
display arp detection statistics [ interface
interface-type interface-number ] [ | { begin |
exclude | include } regular-expression ]
reset arp detection statistics [ interface
interface-type interface-number ]
Figure 95, configure Switch A as a DHCP server and enable 802.1X on Switch B. Enable
Command
system-view
vlan vlan-id
arp restricted-forwarding enable
276
Remarks
N/A
N/A
Disabled by default.
Remarks
Available in any view.
Available in any view.
Available in user view.