272 CHAPTER 31: NTP CONFIGURATION GUIDE
[DeviceB] display ntp-service sessions
Complete Configuration #
ntp-service unicast-server 1.0.1.11
Precautions The local clock of a 3Com Switch 5500, 5500G, or 4210 cannot be set as a
reference clock. It can synchronize other devices as a reference clock only when its
clock is synchronized.
NTP Symmetric Peers
Mode Configuration
Network Diagram Figure 83 Network diagram for NTP symmetric peers mode configuration
Networking and
Configuration
Requirements
■ The local clock of Device A is to be used as a reference source, with the stratum
level of 2.
■ Device C is a Switch 5500 which takes Device A as the time server, and Device
A automatically works in the server mode.
■ The local clock of Device B is to be used as a reference source, with the stratum
level of 1. Set Device B to take Device C as the symmetric-peer.
Applicable Products
Configuration Procedure
■ Configure Device C.
# Set Device A as the time server.
<DeviceC> system-view
[DeviceC] ntp-service unicast-server 3.0.1.31
■ Configure Device B (after Device C is synchronized to Device A).
Device A
Device B Device C
3.0.1.31/24
3.0.1.32/24 3.0.1.33/24
Product series Software version Hardware version
Switch 5500 Release V03.02.04 All versions
Switch 5500G Release V03.02.04 All versions
Switch 4500 Release V03.03.00 All versions
Switch 4210 Release V03.01.00 All versions
