Configuring the ntp symmetric mode, Network requirements – H3C Technologies H3C S5120 Series Switches User Manual

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1-17

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)

# Specify Device A as the NTP server of Device B so that Device B is synchronized to Device A.

system-view

[DeviceB] ntp-service unicast-server 1.0.1.11

# View the NTP status of Device B after clock synchronization.

[DeviceB] display ntp-service status

Clock status: synchronized

Clock stratum: 3

Reference clock ID: 1.0.1.11

Nominal frequency: 100.0000 Hz

Actual frequency: 100.0000 Hz

Clock precision: 2^18

Clock offset: 0.0000 ms

Root delay: 31.00 ms

Root dispersion: 1.05 ms

Peer dispersion: 7.81 ms

Reference time: 14:53:27.371 UTC Sep 19 2005 (C6D94F67.5EF9DB22)

As shown above, Device B has been synchronized to Device A, and the clock stratum level of Device B

is 3, while that of Device A is 2.

# View the NTP session information of Device B, which shows that an association has been set up

between Device B and Device A.

[DeviceB] display ntp-service sessions

source reference stra reach poll now offset delay disper

**************************************************************************

[12345] 1.0.1.11 127.127.1.0 2 63 64 3 -75.5 31.0 16.5

note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured

Total associations : 1

Configuring the NTP Symmetric Mode

Network requirements

Perform the following configurations to synchronize time among devices:

The local clock of Device A is to be configured as a reference source, with the stratum level of 2.

Device B works in the client mode and Device A is to be used as the NTP server of Device B.

After Device B is synchronized to Device A , Device C works in the symmetric-active mode and

Device B will act as peer of Device C. Device C is the symmetric-active peer while Device B is the

symmetric-passive peer.