Dell PowerConnect M6348 Cli Reference Manual page 559

Command Mode
Global Configuration mode
User Guidelines
This command has no user guidelines.
Example
The following example defines an arp cachesize of 500.
console(config)#arp cachesize 500
arp dynamicrenew
Use the arp dynamicrenew command in Global Configuration mode to enable the ARP
component to automatically renew dynamic ARP entries when they age out. To disable the
automatic renewal of dynamic ARP entries when they age out, use the no form of the command.
Syntax
arp dynamicrenew
no arp dynamicrenew
Default Configuration
The default state is enabled.
Command Mode
Global Configuration mode
User Guidelines
When an ARP entry reaches its maximum age, the system must decide whether to retain or
delete the entry. If the entry has recently been used to forward data packets, the system will
renew the entry by sending an ARP request to the neighbor. If the neighbor responds, the age of
the ARP cache entry is reset to 0 without removing the entry from the hardware. Traffic to the
host continues to be forwarded in hardware without interruption. If the entry is not being used
to forward data packets, then the entry is deleted from the ARP cache, unless the dynamic
renew option is enabled. If the dynamic renew option is enabled, the system sends an ARP
request to renew the entry. When an entry is not renewed, it is removed from the hardware and
subsequent data packets to the host trigger an ARP request. Traffic to the host is lost until the
router receives an ARP reply from the host. Gateway entries, entries for a neighbor router, are
always renewed. The dynamic renew option only applies to host entries.
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