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Network Time Protocol (NTP) is a networking protocol for the clock synchronization between computer systems over variable-latency data networks. Cisco WLCs must synchronize time with an NTP or a Simple NTP (SNTP) server by authentication. By default, an MD5 checksum is used.
Configure the NTP version by entering this command:
config time ntp auth enable server-index key-index—Enables NTP/SNTP authentication on a given NTP/SNTP server.
config time ntp key-auth add key-index key-typekey-format key—Adds an authentication key. By default MD5 is used. The key format can be "ascii" or "hex".
Configure the NTP interval by entering this command:
config time ntp key-auth delete key-index—Deletes authentication keys.
config time ntp auth disable server-index—Disables NTP/SNTP authentication.
show ntp-keys—Displays the NTP/SNTP authentication related parameter.
Each NTP/SNTP server IP address is added to the controller database. Each controller searches for an NTP/SNTP server and obtains the current time upon reboot and at each user-defined polling interval (daily to weekly).
Use these commands to configure an NTP/SNTP server to obtain the date and time:
To specify the NTP/SNTP server for the controller, enter this command:
config time ntp server index ip_address or dns_domain
To specify the polling interval (in seconds), enter this command:
To delete an NTP server IP address or DNS server from the controller, enter this command:
config time ntp delete NTP_server index