H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 42)

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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: 31.00 ms
Root dispersion: 8.31 ms
Peer dispersion: 34.30 ms
Reference time: 16:01:51.713 UTC Sep 19 2012 (C6D95F6F.B6872B02)
# Display NTP session information for Switch A, which shows that an association has been set up
between Switch A and Switch C.
[SwitchA-Vlan-interface2] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234] 3.0.1.31 127.127.1.0 3 254 64 62 -16.0 32.0 16.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
# NTP authentication is enabled on Switch B, but not enabled on Switch C, so Switch B cannot
synchronize to Switch C.
[SwitchB-Vlan-interface2] display ntp-service status
Clock status: unsynchronized
Clock stratum: 16
Reference clock ID: none
Nominal frequency: 100.0000 Hz
Actual frequency: 100.0000 Hz
Clock precision: 2^18
Clock offset: 0.0000 ms
Root delay: 0.00 ms
Root dispersion: 0.00 ms
Peer dispersion: 0.00 ms
Reference time: 00:00:00.000 UTC Jan 1 1900(00000000.00000000)
# Enable NTP authentication on Switch C. Configure an NTP authentication key, with the key ID of
88 and key value of 123456. Specify the key as a trusted key.
[SwitchC] ntp-service authentication enable
[SwitchC] ntp-service authentication-keyid 88 authentication-mode md5 123456
[SwitchC] ntp-service reliable authentication-keyid 88
# Specify Switch C as an NTP broadcast server, and associate the key 88 with Switch C.
[SwitchC] interface vlan-interface 2
[SwitchC-Vlan-interface2] ntp-service broadcast-server authentication-keyid 88
# After NTP authentication is enabled on Switch C, Switch B can synchronize to Switch C. Display
NTP service status information on Switch B, and you can see that Switch B has synchronized to
Switch C, the stratum level of Switch B is 4, and the stratum level of Switch C is 3.
[SwitchB-Vlan-interface2] display ntp-service status
Clock status: synchronized
Clock stratum: 4
Reference clock ID: 3.0.1.31
Nominal frequency: 64.0000 Hz
Actual frequency: 64.0000 Hz