28
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 2005 (C6D95F6F.B6872B02)
As shown above, Device D has been synchronized to Device C, and the clock stratum level of Device D
is 3, while that of Device C is 2.
# View the NTP session information of Device D, which shows that an association has been set up
between Device D and Device C.
[DeviceD-Vlan-interface2] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[1234] 3.0.1.31 127.127.1.0 2 254 64 62 -16.0 31.0 16.6
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 1
4. Configure Device B:
Because Device A and Device C are on different subnets, you must enable the multicast functions on
Device B before Device A can receive multicast messages from Device C.
# Enable IP multicast routing and IGMP.
<DeviceB> system-view
[DeviceB] multicast routing-enable
[DeviceB] interface vlan-interface 2
[DeviceB-Vlan-interface2] pim dm
[DeviceB-Vlan-interface2] quit
[DeviceB] vlan 3
[DeviceB-vlan3] port ethernet 1/0/1
[DeviceB-vlan3] quit
[DeviceB] interface vlan-interface 3
[DeviceB-Vlan-interface3] igmp enable
[DeviceB-Vlan-interface3] igmp static-group 224.0.1.1
[DeviceB-Vlan-interface3] quit
[DeviceB] interface ethernet 1/0/1
[DeviceB-Ethernet1/0/1] igmp-snooping static-group 224.0.1.1 vlan 3
5. Configure Device A:
<DeviceA> system-view
[DeviceA] interface vlan-interface 3
# Configure Device A to work in multicast client mode and receive multicast messages on VLAN-interface
3.
[DeviceA-Vlan-interface3] ntp-service multicast-client
# View the NTP status of Device A after clock synchronization.
[DeviceA-Vlan-interface3] display ntp-service status
Clock status: synchronized
Clock stratum: 3
Reference clock ID: 3.0.1.31
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