Patton electronic SmartNode 4110 Series ユーザーズマニュアル
SNTP client configuration task list
288
SmartWare Software Configuration Guide
26 • SNTP client configuration
Mode: Configure
Note
This command is only relevant in anycast operating-mode.
Example: SNTP client anycast address
In the following example anycast requests are sent to SNTP server at IP address 132.163.4.101 using port 123
of the SNTP server.
of the SNTP server.
node(cfg)#sntp-client anycast-address 132.163.4.101 port
Enabling and disabling local clock offset compensation
The Simple Network Time Protocol (SNTP) Version 4 is an adaptation of the Network Time Protocol (NTP)
that is used to synchronize computer clocks in the Internet. While not necessary in a conforming SNTP client,
in unicast and anycast modes it is highly recommended that the transmit timestamp in the request is set to the
time of day according to the client clock in NTP timestamp format. This allows a simple calculation to deter-
mine the propagation delay between the server and client and to align the local clock generally within a few
tens of milliseconds relative to the server. In addition, this provides a simple method to verify that the server
reply is in fact a legitimate response to the specific client request and to avoid replays.
that is used to synchronize computer clocks in the Internet. While not necessary in a conforming SNTP client,
in unicast and anycast modes it is highly recommended that the transmit timestamp in the request is set to the
time of day according to the client clock in NTP timestamp format. This allows a simple calculation to deter-
mine the propagation delay between the server and client and to align the local clock generally within a few
tens of milliseconds relative to the server. In addition, this provides a simple method to verify that the server
reply is in fact a legitimate response to the specific client request and to avoid replays.
In multicast mode, the client has no information available to calculate the propagation delay or to determine
the validity of the server unless the NTP authentication scheme is used.
the validity of the server unless the NTP authentication scheme is used.
This procedure describes how to enable or disable the compensation for local clock offset.
Mode: Configure
Example: Enabling the SNTP client root delay compensation
node(cfg)#sntp-client root-delay-compensation
Step
Command
Purpose
1
node(cfg)#sntp-client anycast-address ip-
address {port | port-number}
address {port | port-number}
Set the anycast-address to ip-address a designated
local broadcast or multicast group address to
which a request is sent. In addition an explicit
SNTP server port-number in the range from 1 to
65535 can be defined or the argument port is
selected, which sets the value for port to 123. If
none of the optional argument is used the value for
port is set to 123.
local broadcast or multicast group address to
which a request is sent. In addition an explicit
SNTP server port-number in the range from 1 to
65535 can be defined or the argument port is
selected, which sets the value for port to 123. If
none of the optional argument is used the value for
port is set to 123.
Step
Command
Purpose
1
node(cfg)#[no] sntp-client local-clock-
offset
offset
Enables the SNTP client’s compensation for local
clock offset. Using the no command syntax dis-
ables this feature.
clock offset. Using the no command syntax dis-
ables this feature.