CLI Reference IP Address Configuration Commands
The default timeout is 3600 seconds.
Interface configuration mode.
The ARP timeout setting is only applicable to the IP address and the MAC address
mapping that are learned dynamically. The shorter the timeout, the truer the mapping
table saved in the ARP cache, but the more network bandwidth occupied by the ARP.
Hence the advantages and disadvantages should be weighted. Generally it is not
necessary to configure the ARP timeout unless there is a special requirement.
The following is an example of setting the timeout for the dynamic ARP mapping record
that is learned dynamically from FastEthernet port 0/1 to 120 seconds.
interface fastEthernet 0/1
arp timeout 120
Clear the ARP cache list.
Show the interface information
Use this command to set the maximum number of trusted ARP entries. The no form of
this command restores it to the default value.
Maximum number of trusted ARP entries.
Global configuration mode.
To make this command valid, enable the trusted ARP function firstly. The trusted ARP
entries and other entries share the memory. Too much trusted ARP entries may lead to
insufficient ARP entry space. In general, you should set the maximum number of trusted
ARP entries according to your real requirements.
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