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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-11350-01
Chapter 5 Administering the Access PointWireless Device Access
Managing the System Time and Date
Configuring ARP Caching
Beginning in privileged EXEC mode, follow these steps to configure the wireless device to maintain an
ARP cache for associated clients:
This example shows how to configure ARP caching on an access point:
AP# configure terminal
AP(config)# dot11 arp-cache
AP(config)# end
Managing the System Time and Date
You can manage the system time and date on the wireless device automatically, using the Simple
Network Time Protocol (SNTP), or manually, by setting the time and date on the wireless device.
Note For complete syntax and usage information for the commands used in this section, refer to the Cisco IOS
Configuration Fundamentals Command Reference for Release 12.3.
This section contains this configuration information:
• Understanding Simple Network Time Protocol, page 5-27
• Configuring SNTP, page 5-28
• Configuring Time and Date Manually, page 5-28
Understanding Simple Network Time Protocol
Simple Network Time Protocol (SNTP) is a simplified, client-only version of NTP. SNTP can only
receive the time from NTP servers; it cannot be used to provide time services to other systems. SNTP
typically provides time within 100 milliseconds of the accurate time, but it does not provide the complex
filtering and statistical mechanisms of NTP.
You can configure SNTP to request and accept packets from configured servers or to accept NTP
broadcast packets from any source. When multiple sources are sending NTP packets, the server with the
best stratum is selected. Click this URL for more information on NTP and strata:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
dot11 arp-cache [ optional ] Enable ARP caching on the wireless device.
• (Optional) Use the optional keyword to enable ARP caching only for
the client devices whose IP addresses are known to the wireless
device.
Step 3
end Return to privileged EXEC mode.
Step 4
show running-config Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.