3Com S7906E - Switch, Configuration Manual

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In the step above, Device B and Device C are configured as symmetric peers, with Device C in the
symmetric-active mode and Device B in the symmetric-passive mode. Because the stratus level of
Device C is 1 while that of Device B is 3, Device B is synchronized to Device C.
# View the NTP status of Device B after clock synchronization.
[DeviceB] display ntp-service status
Clock status: synchronized
Clock stratum: 2
Reference clock ID: 3.0.1.33
Nominal frequency: 100.0000 Hz
Actual frequency: 100.0000 Hz
Clock precision: 2^18
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, Device B has been synchronized to Device C, and the clock stratum level of Device B
is 2, while that of Device C is 1.
# View the NTP session information of Device B, which shows that an association has been set up
between Device B and Device C.
[DeviceB] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[245] 3.0.1.31 127.127.1.0 2 15 64 24 10535.0 19.6 14.5
[1234] 3.0.1.33 LOCL 1 14 64 27 -77.0 16.0 14.8
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 2
Configuring NTP Broadcast Mode
Network requirements
z
Switch C’s local clock is to be used as a reference source, with the stratum level of 2.
z
Switch C works in the broadcast server mode and sends out broadcast messages from
VLAN-interface 2.
z
Switch A and Switch D work in the broadcast client mode. Switch A listens to broadcast messages
through its VLAN-interface 3 and Switch D from its VLAN-interface 2.