H3C Technologies H3C SecPath F1000-E - Manual (Page 7)

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To do… Use the command… Remarks
Enter system view system-view —
Enable the ARP entry check arp check enable
Optional
By default, ARP entry check is enabled, or
in other words, the device is disabled from
learning multicast MAC addresses.
Enabling the Support for ARP Requests from a Natural Network
This feature enables the device to learn the MAC address from an ARP request whose source IP address
is on the same natural network but a different subnet as the IP address of the inbound interface.
Suppose that the IP address of VLAN-interface 10 is 10.10.10.5/24 and that this interface receives an
ARP packet from 10.11.11.1/8. Because these two IP addresses are not on the same subnet,
VLAN-interface 10 cannot process the packet. With this feature enabled, the device makes a judgment
on natural network basis. Because 10.10.10.5/24 is a Class A address whose default mask length is 8,
it is on the same natural network as 10.11.1/8. Thus VLAN-interface 10 can learn the MAC address
corresponding to the source IP address 10.11.11.1.
Follow these steps to enable the support for ARP requests from a natural network:
To do… Use the command… Remarks
Enter system view system-view —
Enable the support for ARP
requests from a natural network
naturemask-arp enable
Required
Disabled by default.
Displaying and Maintaining ARP
To do… Use the command… Remarks
Display ARP entries in the ARP
table
display arp [ [ all | dynamic | static ] |
vlan vlan-id | interface interface-type
interface-number ] [ [ verbose ] [ | { begin
| exclude | include } regular-expression ]
| count ]
Available in any view
Display the ARP entry for a
specified IP address
display arp ip-address [ verbose ] [ |
{ begin | exclude | include }
regular-expression ]
Available in any view
Display the ARP entries for a
specified VPN instance
display arp vpn-instance
vpn-instance-name [ | { begin | exclude |
include } regular-expression | count ]
Available in any view
Display the aging time for dynamic
ARP entries
display arp timer aging Available in any view
Clear ARP entries from the ARP
table reset arp { all | dynamic | static |
interface interface-type interface-number }
Available in user view