3Com Switch 8800 Advanced Software V5 Configuration Guide

NTP Configuration Examples 1083
[SwitchA-Vlan-interface3] ntp-service multicast-client
# View the NTP status of Switch A after clock synchronization.
[SwitchA-Vlan-interface3] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
Nominal frequency: 64.0000 Hz
Actual frequency: 64.0000 Hz
Clock precision: 2^7
Clock offset: 0.0000 ms
Root delay: 40.00 ms
Root dispersion: 10.83 ms
Peer dispersion: 34.30 ms
Reference time: 16:02:49.713 UTC Sep 19 2005 (C6D95F6F.B6872B02)
As shown above, Switch A has been synchronized to Switch C, and the clock
stratum level of Switch A is 3, while that of Switch C is 2.
# View the NTP session information of Switch A, which shows that an association
has been set up between Switch A and Switch C.
[SwitchA-Vlan-interface3] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234] 3.0.1.31 127.127.1.0 2 255 64 26 -16.0 40.0 16.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
n
Refer to “IGMP Configuration” on page 523 for how to configure IGMP.
Configuring NTP
Server/Client Mode with
Authentication
Network requirements
The local clock of Device A is to be configured as a reference source, with the
stratum level of 2. Device A is to be used as the NTP server of Device B, with
Device B as the client and Device A then as the server automatically. At the same
time, NTP authentication is to be enabled for Device A and Device B.
Network diagram
Figure 318 Network diagram for configuration of NTP server/client mode with
authentication
Configuration procedure
1 Configuration on Device A:
# Specify the local clock as the reference source, with the stratum level of 2.
<DeviceA> system-view
[DeviceA] ntp-service refclock-master 2
2 Configuration on Device B:
1 .0. 1. 11/ 24 1.0 .1. 12/ 24
Device A Device B