R3204P16-HP Load Balancing Module Network Management Configuration Guide-6PW101

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After ARP entry check is disabled, the LB card can learn the ARP entry with a multicast MAC address, and
you can also configure such a static ARP entry on the card.
Follow these steps to enable ARP entry check:
To do… Use the command…
Remarks
Enter system view system-view —
Enable ARP entry check arp check enable
Optional
Disabled by default.
Enabling natural mask support for ARP requests
This feature enables the LB module 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.
Suppose that VLAN-interface 10 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 r e c eivi n g
interface’s 24-bit subnet mask is not in the subnet 10.10.10.5/24, VLAN-interface 10 cannot process the
ARP packet.
With this feature enabled, the LB card 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, VLAN-interface 10 can learn the sender IP and MAC addresses in the request.
Follow these steps to enable natural mask support for ARP requests:
To do… Use the command…
Remarks
Enter system view system-view —
Enable natural mask support for
ARP requests
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 age timer 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
NOTE:
Clearing ARP entries from the ARP table may cause communication failures.