Configuration MP.11-R Installation and Management
Network Parameters
72
SNTP-DNS
SNTP-DNS Overview
The Simple Network Time Protocol (SNTP) allows for a network entity to communicate with time servers in the network/
internet to retrieve and synchronize time of day information.
If SNTP feature is enabled, the device will attempt to retrieve the time of day from the configured time servers (primary or
secondary). If successful, the TMP device will periodically poll the timeserver it has communicated with to synchronize
the time of day information. If SNTP is disabled, or if it fails to communicate with the configured time servers, it will use
the system uptime to update the relevant time objects. If this feature is disabled, then you can manually configure the
date and time parameters. If you do not configure these objects manually, then they will be populated with the device’s
system uptime.
NOTES:The time servers can be configured using either the host name (Domain Name) or the IP address. If these
servers are configured with the host name, then the DNS client feature must be enabled and configured properly.
• If a time server is configured with a 0.0.0.0 IP address, then the SNTP client in the TMP device will not send a
time request to that server.
• When SNTP is enabled, it will take some time for the device to retrieve the time of day from the configured time
servers and update the relevant date and time parameters.
Primary and Secondary SNTP Servers
The SNTP client first attempts to retrieve the time of day from the configured primary server. If the device does not
receive a response from the primary server, then it tries the secondary server. If the device does not receive a response
from the secondary server, then it again attempts the primary server. The device retries a total of three times the primary
and secondary servers.
DNS Server requirement
When you configure the Domain Name of the SNTP server, the device resolves the SNTP server address with either
primary or secondary DNS server.
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