3Com Switch 8800 Advanced Software V5 Configuration Guide

1088 CHAPTER 85: NTP CONFIGURATION
[CE2] display ntp-service trace
server 127.0.0.1,stratum 2, offset -0.013500, synch distance 0.03154
server 10.1.1.1,stratum 1, offset -0.506500, synch distance 0.03429
refid 127.127.1.0
Configuring MPLS VPN
Time Synchronization in
Symmetric Peers Mode
Network requirements
It is required that PE 2 can get synchronized to PE 1 in the symmetric peers mode,
with PE 1 synchronized to the local reference source, having a clock stratum level
of 1.
Network diagram
See Figure 320.
Configuration procedure
1 Configuration on PE 1:
# Specify the local clock as the reference source, with the stratum level of 1.
<PE1> system-view
[PE1] ntp-service refclcok-master 1
2 Configuration on PE 2:
# Specify PE 1 in VPN 1 as the symmetric-passive peer of PE 2.
<PE2> system-view
[PE2] ntp-service unicast-peer vpn-instance vpn1 10.1.1.2
# View the NTP session information and status information on PE 2 a certain
period of time later. The information should show that PE 2 has been synchronized
to PE 1, with the clock stratum level of 2.
[PE2] display ntp-service status
Clock status: synchronized
Clock stratum: 2
Reference clock ID: 10.1.1.2
Nominal frequency: 63.9100 Hz
Actual frequency: 63.9100 Hz
Clock precision: 2^7
Clock offset: 0.0000 ms
Root delay: 32.00 ms
Root dispersion: 0.60 ms
Peer dispersion: 7.81 ms
Reference time: 02:44:01.200 UTC Jan 1 2001(BDFA6D71.33333333)
[PE2] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[12345]10.1.1.2 LOCL 1 1 64 29 -12.0 32.0 15.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
[PE2] display ntp-service trace
server 127.0.0.1,stratum 2, offset -0.012000, synch distance 0.02448
server 10.1.1.2,stratum 1, offset 0.003500, synch distance 0.00781
refid 127.127.1.0