H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 85)

6-17
Figure 6-8 Network diagram for NTP symmetric peers mode configuration
Switch
AC 1 AC 2
Vlan-int
3.0.1.31/24
Vlan-int
3.0.1.32/24 Vlan-int
3.0.1.33/24
Configuration procedure
1) Configuration on Switch:
# Specify the local clock as the reference source, with the stratum level of 2.
system-view
[Switch] ntp-service refclock-master 2
2) Configuration on AC 1:
# Specify Switch as the NTP server of AC 1.
system-view
[AC1] ntp-service unicast-server 3.0.1.31
3) Configuration on AC 2 (after AC1 is synchronized to Switch):
# Specify the local clock as the reference source, with the stratum level of 1.
system-view
[AC2] ntp-service refclock-master 1
# Configure AC 1 as a symmetric peer after local synchronization.
[AC2] ntp-service unicast-peer 3.0.1.32
In the step above, AC 1 and AC 2 are configured as symmetric peers, with AC 2 in the symmetric-active
mode and AC 1 in the symmetric-passive mode. Because the stratus level of AC 2 is 1 while that of AC
1 is 3, AC 1 is synchronized to AC 2.
# View the NTP status of AC 1 after clock synchronization.
[AC1] display ntp-service status
Clock status: synchronized
Clock stratum: 2
Reference clock ID: 3.0.1.33
Nominal frequency: 64.0000 Hz
Actual frequency: 64.0000 Hz
Clock precision: 2^7
Clock offset: -21.1982 ms
Root delay: 15.00 ms
Root dispersion: 775.15 ms
Peer dispersion: 34.29 ms
Reference time: 15:22:47.083 UTC Sep 19 2005 (C6D95647.153F7CED)
As shown above, AC 1 has been synchronized to AC 2, and the clock stratum level of AC 1 is 2, while
that of AC 2 is 1.