System information

Configuring IP Information
Configuring ARP
Cisco Small Business 200 Series Smart Switch Administration Guide 157
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Configuring ARP
The switch maintains an ARP (Address Resolution Protocol) Table for all the known
devices that reside in its directly connected IP subnets. A directly connected IP
subnet is the subnet that a IPv4 interface of the switch is connected to. When the
switch needs to send/route a packet to a local device, it searches the ARP Table to
obtain the MAC address of the device. The ARP Table contains both static and
dynamic addresses. Static addresses are manually configured and do not age out.
The switch creates dynamic addresses from the ARP packets it receives. Dynamic
addresses age out after a configured time.
The ARP Table Page enables viewing dynamic ARP entries that the switch has
learned, changing the ARP entry aging time, clearing ARP entries, and adding or
deleting static ARP entries.
NOTE The IP/MAC address mapping information in the ARP Table is used by the switch to
forward traffic originated by the switch.
To define the ARP tables:
STEP 1 Click IP Configuration > ARP. The ARP Table Page opens.
STEP 2 Enter the parameters.
• ARP Entry Age Out—Enter the number of seconds that dynamic addresses
can remain in the ARP Table. A dynamic address ages out after the time it is
in the table exceeds the ARP Entry Age Out time. When a dynamic address
ages out, it is deleted from the table, and needs to be relearned to be entered
into the table again.
• Clear ARP Table Entries—Select the type of ARP entries to be cleared the
system.
-
All —Deletes all of the static and dynamic addresses immediately.
-
Dynamic —Deletes all of the dynamic addresses immediately.
-
Static —Deletes all of the static addresses immediately.
-
Normal Age Out —Deletes dynamic addresses based on the configured
ARP Entry Age Out time.
The ARP Table displays the following fields:
• Interface—The IPv4 Interface of the directly connected IP subnet where the
IP device resides.