413
•
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-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
By default, ARP detection is
disabled.
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
}
*
By default, ARP packet validity
check is disabled.
6.
Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view.
interface interface-type
interface-number
N/A
7.
(Optional.) Configure the interface
as a trusted interface excluded
from ARP detection.
arp detection trust
By default, an interface is untrusted.
Configuring ARP restricted forwarding
NOTE:
ARP restricted forwarding does not apply to ARP packets with multiport MAC as their destination
MAC addresses.
ARP restricted forwarding controls the forwarding of ARP packets that are received on untrusted
interfaces and have passed user validity check as follows:
•
If the packets are ARP requests, they are forwarded through the trusted interface.
•
If the packets are ARP replies, they are forwarded according to their destination MAC address.
If no match is found in the MAC address table, they are forwarded through the trusted interface.
Configure user validity check before you configure ARP restricted forwarding.
To enable ARP restricted forwarding:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan vlan-id
N/A
3.
Enable ARP restricted forwarding.
arp restricted-forwarding
enable
By default, ARP restricted
forwarding is disabled.
