The switch retains the parameter settings for both time protocols even if you change from one protocol to the
other. Thus, if you select a time protocol, the switch uses the parameters you last configured for the selected
protocol.
Simply selecting a time synchronization protocol does not enable that protocol on the switch unless you also
enable the protocol itself (step 2, above). For example, in the factory-default configuration, TimeP is the selected
time synchronization method. However, because TimeP is disabled in the factory-default configuration, no time
synchronization protocol is running.
Disabling time synchronization
You can execute
no timesync
(global config level of the CLI) to disable time synchronization without changing
the TimeP, SNTP, or NTP configuration.
TimeP: Selecting and configuring
The following table shows TimeP parameters and their operations.
Table 1: TimeP parameters
TimeP
parameter
Operation
Time Sync
Method
Used to select either TIMEP, SNTP, NTP, or None as the time synchronization method.
TimeP Mode
Disabled
TimeP does not operate, even if specified by the Menu interface
Time Sync Method
parameter or the CLI
timesync
command.
DHCP
When TimeP is selected as the time synchronization method, the switch attempts to acquire a
TimeP server IP address via DHCP. If the switch receives a server address, it polls the server
for updates according to the TimeP poll interval. If the switch does not receive a TimeP server
IP address, it cannot perform time synchronization updates.
Manual
When TimeP is selected as the time synchronization method, the switch attempts to poll the
specified server for updates according to the TimeP poll interval. If the switch fails to receive
updates from the server, time synchronization updates do not occur.
Server
Address
Used only when the
TimeP Mode
is set to
Manual
. Specifies the IP address of the TimeP
server that the switch accesses for time synchronization updates. You can configure one
server.
Viewing the current TimeP configuration (CLI)
Using different
show
commands, you can display either the full TimeP configuration or a combined listing of all
TimeP, SNTP, and VLAN IP addresses configured on the switch.
Syntax:
show timep
Lists both the time synchronization method (TimeP, SNTP, or None) and the TimeP configuration, even if SNTP is
not the selected time protocol. (If the TimeP Mode is set to
Disabled
or
DHCP
, the Server field does not appear.)
Chapter 2 Time Protocols
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