Chapter 30
| IP Interface Commands
IPv4 Interface
– 917 –
Command Usage
â—† When a ARP entry expires, it is deleted from the cache and an ARP request
packet is sent to re-establish the MAC address.
â—† The aging time determines how long dynamic entries remain in the cache. If
the timeout is too short, the router may tie up resources by repeating ARP
requests for addresses recently flushed from the table.
Example
This example sets the ARP cache timeout for 15 minutes (i.e., 900 seconds).
Console(config)#arp timeout 900
Console(config)#
ip proxy-arp This command enables proxy Address Resolution Protocol (ARP). Use the no form
to disable proxy ARP.
Syntax
[no] ip proxy-arp
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Command Usage
â—† Proxy ARP allows a non-routing device to determine the MAC address of a host
on another subnet or network.
â—† End stations that require Proxy ARP must view the entire network as a single
network. These nodes must therefore use a smaller subnet mask than that used
by the router or other relevant network devices.
â—† Extensive use of Proxy ARP can degrade router performance because it may
lead to increased ARP traffic and increased search time for larger ARP address
tables.
Example
Console(config)#interface vlan 3
Console(config-if)#ip proxy-arp
Console(config-if)#
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