Cisco SX350 Series Administration Manual page 354

IP Configuration
IPv4 Management and Interfaces
NOTE
STEP 1
STEP 2
STEP 3
STEP 4
Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
ARP
The device maintains an ARP (Address Resolution Protocol) table for all known devices that
reside in the IP subnets directly connected to it. A directly-connected IP subnet is the subnet to
which an IPv4 interface of the device is connected. When the device is required 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 device creates dynamic addresses from the ARP packets it
receives. Dynamic addresses age out after a configured time.
The mapping information is used for routing as well as to forward generated traffic.
To define the ARP tables:
Click IP Configuration > IPv4 Management and Interfaces > ARP.
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 only returns when it is relearned.
• Clear ARP Table Entries—Select the type of ARP entries to be cleared from 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.
Click Apply. The ARP global settings are written to the Running Configuration file.
The ARP table displays the following fields:
• Interface—The IPv4 Interface of the directly-connected IP subnet where the IP device
resides.
• IP Address—The IP address of the IP device.
• MAC Address—The MAC address of the IP device.
• Status—Whether the entry was manually entered or dynamically learned.
Click Add.
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