H3C Technologies H3C WX5500E Series Access Controllers User Manual

Page 38

# Display NTP session information for Switch C, which shows that an association has been set up

between Switch C and the device.

[SwitchC-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

Configure Switch B:
Because Switch A and the device are on different subnets, you must enable the multicast function

on Switch B before Switch A can receive multicast messages from the device.
# Enable IP multicast routing and IGMP.

system-view

[SwitchB] multicast routing-enable

[SwitchB] interface vlan-interface 2

[SwitchB-Vlan-interface2] pim dm

[SwitchB-Vlan-interface2] quit

[SwitchB] vlan 3

[SwitchB-vlan3] port gigabitethernet 1/0/1

[SwitchB-vlan3] quit

[SwitchB] interface vlan-interface 3

[SwitchB-Vlan-interface3] igmp enable

[SwitchB-Vlan-interface3] igmp static-group 224.0.1.1

[SwitchB-Vlan-interface3] quit

[SwitchB] interface gigabitethernet 1/0/1

[SwitchB-GigabitEthernet1/0/1] igmp-snooping static-group 224.0.1.1 vlan 3

Configure Switch A:
# Configure Switch A to operate in multicast client mode and receive multicast messages on
VLAN-interface 3.

system-view

[SwitchA] interface vlan-interface 3

[SwitchA-Vlan-interface3] ntp-service multicast-client

# Display the NTP status of Switch A after clock synchronization.

[SwitchA-Vlan-interface3] display ntp-service status

Clock status: synchronized

Clock stratum: 3

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: 40.00 ms

Root dispersion: 10.83 ms

Peer dispersion: 34.30 ms

Reference time: 16:02:49.713 UTC Sep 19 2012 (C6D95F6F.B6872B02)

The output shows that Switch A has synchronized to the device. The stratum level of Switch A is 3,

and that of the device is 2.