Fortinet MR1 - Manual (Page 305)

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6.1.2.3 arp cachesize
This command configures the maximum number of entries in the ARP cache.
Syntax
arp cachesize <256-1920>
no arp cachesize
<256-1920> - The range of cache size is 256 to 1920.
no - This command configures the default ARP cache size.
Default Setting
The default cache size is 1920.
Command Mode
Global Config
6.1.2.4 arp dynamicrenew
This command enables ARP component to automatically renew ARP entries of type dynamic
when they age out.
Syntax
arp dynamicrenew
no arp dynamicrenew
no - This command disables ARP component from automatically renewing ARP entries of type
dynamic when they age out.
Default Setting
Enabled
Command Mode
Global Config
6.1.2.5 arp purge
This command causes the specified IP address to be removed from the ARP table. Only
entries of type dynamic or gateway are affected by this command.
Syntax
arp purge <ipaddr>