3com 5500-SI Manual De Usuario

C

HAPTER

 22: F

ILE

 S

YSTEM

 M

ANAGEMENT

3 Configure Switch 5: (Switch 4 has been synchronized by Switch 3) 

a Enter System View. 

<switch5> system-view

b After performing local synchronization, set Switch 4 as a peer. 

[switch5]ntp-service unicast-peer 3.0.1.32

The above examples configure Switch 4 and Switch 5 as peers and configures Switch 
5 in active peer mode and Switch 4 in passive peer mode. Since Switch 5 is at stratum 
1 and Switch 4 is at stratum 3, synchronize Switch 4 by Switch 5. 

After synchronization, Switch 4 status is shown as follows: 

[switch4]display ntp-service status

clock status: synchronized

 clock stratum: 8

 reference clock ID: 3.0.1.31

 nominal frequency: 100.0000 Hz

 actual frequency: 100.0000 Hz

 clock precision: 2^17

 clock offset: 0.0000 ms

 root delay: 0.00 ms

 root dispersion: 10.94 ms

 peer dispersion: 10.00 ms

reference time: 20:54:25.156 UTC Mar 7 2002(C0325201.2811A112)

By this time, Switch 4 has been synchronized by Switch 5 and it is at stratum 2, or 
higher than Switch 5 by 1. 

Display the sessions of Switch 4 and you will see Switch 4 has been connected with 
Switch 5. 

[switch4]display ntp-service sessions

source 

reference stra reach poll  now offset  delay disper

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

[12345]127.127.1.0 LOCAL(0) 7   377   64   57    0.0    0.0    1.0

[5]1.0.1.11        0.0.0.0 16     0   64    -    0.0    0.0    0.0

[5]128.108.22.44   0.0.0.0 16     0   64    -    0.0    0.0    0.0

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

configured

On Switch 3, set local clock as the NTP master clock at stratum 2 and configure to 
broadcast packets from Vlan-interface2. Configure Switch 4 and Switch 1 to listen to 
the broadcast from their Vlan-interface2 respectively. (Note that Switch 3 must 
support setting local clock as the NTP master clock.)

1 Configure Switch 3: 

a Enter System View. 

<switch3> system-view

b Set the local clock as the NTP master clock at stratum 2. 

[switch3]ntp-service refclock-master 2