Cisco Small Business 200 Series Administration Guide

Administration: Time Settings
SNTP Modes
Cisco Small Business 200 Series Smart Switch Administration Guide 70
7
NOTE The DHCP server must supply DHCP option 100 in order for dynamic time zone configuration
to take place.
SNTP Modes
The device can receive system time from an SNTP server in one of the following ways:
• Client Broadcast Reception (passive mode)—SNTP servers broadcast the time, and the device
listens to these broadcasts. When the device is in this mode, there is no need to define a Unicast
SNTP server.
• Client Broadcast Transmission (active mode)—The device, as an SNTP client, periodically requests
SNTP time updates. This mode works in either of the following ways:
- SNTP Anycast Client Mode—The device broadcasts time request packets to all SNTP servers in
the subnet, and waits for a response.
- Unicast SNTP Server Mode—The device sends Unicast queries to a list of manually-configured
SNTP servers, and waits for a response.
The device supports having all of the above modes active at the same time and selects the best system
time received from an SNTP server, according to an algorithm based on the closest stratum (distance from
the reference clock).
Configuring System Time
Selecting Source of System Time
Use the System Time page to select the system time source. If the source is manual, you can enter the time
here.
!
CAUTION If the system time is set manually and the device is rebooted, the manual time
settings must be reentered.

Cisco Small Business 200 Series Specifications

General

Brand	Cisco
Model	Small Business 200 Series
Category	Switch
Language	English