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Operation Manual - Network Protocol
Quidway S3000-EI Series Ethernet Switches
Chapter 1 ARP Configuration
Huawei Technologies Proprietary
1-3
Table 1-2
Configure the dynamic ARP aging timer
Operation
Command
Configure the dynamic ARP aging timer
arp timer aging aging-time
restore the default dynamic ARP aging time
undo arp timer aging
By default, the aging time of dynamic ARP aging timer is 20 minutes.
1.2.3 Enabling/Disabling ARP the Checking Function of ARP Entry
You can use the following command to control the device whether to learn the ARP
entry where the MAC address is multicast MAC address.
Perform the following configuration in system view.
Table 1-3
Enabling/Disabling ARP the checking function of ARP entry
Operation
Command
Enable the checking of ARP entry, that is, the device
does not learn the ARP entry where the MAC address is
multicast MAC address
arp check enable
Disable the checking of ARP entry, that is, the device
learns the ARP entry where the MAC address is
multicast MAC address
undo arp check enable
By default, the checking of ARP entry is enabled, that is, the device does not learn the
ARP entry where the MAC address is multicast MAC address.
1.3 Gratuitous ARP Configuration
1.3.1 Gratuitous ARP Overview
Gratuitous ARP function is to implement the following functions by sending out
gratuitous ARP packets:
z
By sending gratuitous ARP packets, network devices can figure out whether the IP
addresses of other devices conflict with that of its own.
z
If the device which sends the gratuitous ARP packet changed its hardware
address (probably, it turns off, has its interface card changed, and then reboots),
this packet can make old hardware address in the cache of other devices update
accordingly. For example, when a device receives a gratuitous ARP request
existing in the cache of the device from an IP address, then the sending hardware
address (such as Ethernet address) in the gratuitous ARP request needs to
update the content in the cache. The above operation must be done when a
device receives any gratuitous ARP request. ARP request is broadcast on the