R3303-HP HSR6800 Routers Layer 3 - IP Services Configuration Guide

5
Step Command Remarks
2. Enable dynamic ARP entry
check.
arp check enable
Optional.
Enabled by default.
Enabling natural mask support for ARP requests
This feature enables the device to learn the sender IP and MAC addresses in a received ARP request
whose sender IP address is on the same classful network as but a different subnet from the IP address of
the receiving interface. A classful network refers to a class A, B, or C network.
For example, GigabitEthernet 3/0/1 with IP address 10.10.10.5/24 receives an ARP request from
10.11.11.1/8. Because the subnet address calculated by the AND operation of 10.11.11.1 a n d t h e 24 - b i t
subnet mask of the receiving interface is not in the subnet 10.10.10.5/24, GigabitEthernet 3/0/1 cannot
process the ARP packet.
With this feature enabled, the device calculates the subnet address by using the default mask of the class
A network where 10.10.10.5/24 resides. Because 10.10.10.5/24 is on the same class A network as
10.11.11.1/8, GigabitEthernet 3/0/1 can learn the sender IP and MAC addresses in the request.
To enable natural mask support for ARP requests:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enable natural mask support
for ARP requests.
naturemask-arp enable Disabled by default.
Displaying and maintaining ARP
CAUTION:
Clearing ARP entries from the ARP table might cause communication failures.
Task Command Remarks
Display ARP entries in the ARP
table (in standalone mode).
display arp [ [ all | dynamic | static ] [ slot
slot-number ] | vlan vlan-id | interface
interface-type interface-number ] [ count |
verbose ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display ARP entries in the ARP
table (in IRF mode).
display arp [ [ all | dynamic | static ] [ chassis
chassis-number slot slot-number ] | vlan vlan-id |
interface interface-type interface-number ] [ count
| verbose ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.
Display the ARP entry for a
specific IP address (in
standalone mode).
display arp ip-address [ slot slot-number ]
[ verbose ] [ | { begin | exclude | include }
regular-expression ]
Available in any view.