Using Simple Network Time Protocol
The Simple Network T
ime Protocol (SNTP) feature synchronizes the Universal Coordinated
Time (UTC) to an accuracy within 1 second. This feature adheres to the IEEE RFC 2030 (MIB
is the s5agent). With this feature, the system can obtain the time from any RFC 2030-compliant
NTP/SNTP server.
Important:
If problems occur when you use this feature, try various NTP servers. Some NTP servers
can be overloaded or currently inoperable.
The system retries connecting with the NTP server a maximum of three times, with 5 minutes
between each retry.
Use SNTP to provide a real-time timestamp for the software, shown as Greenwich Mean Time
(GMT).
If you run SNTP, the system synchronizes with the configured NTP server at boot-up and at
user-configurable periods thereafter (the default synchronization interval is 24 hours). The first
synchronization does not occur until network connectivity is established.
SNTP supports primary and secondary NTP servers. The system tries the secondary NTP
server only if the primary NTP server is unresponsive.
To configure SNTP, see the following commands:
• Show SNTP command on page 150
• show sys-info command on page 151
• SNTP enable command on page 151
• No SNTP enable command on page 151
• SNTP server primary address command on page 151
• SNTP server secondary address command on page 152
• No SNTP server command on page 152
• SNTP sync-now command on page 153
• SNTP sync-interval command on page 153
Show SNTP command
The
show SNTP command displays the SNTP information, as well as the configured NTP
servers.
The syntax for the show SNTP command is
show sntp
System configuration using ACLI
150 Configuration — System April 2011
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