H3C Technologies H3C WX6000 Series Access Controllers User Manual
Page 89
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# View the NTP session information of AC 3, which shows that an association has been set up between
AC 3 and AC 2.
[AC3-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
3) Configuration on Switch:
Because AC 1 and AC 2 are on different subnets, you must enable the multicast functions on Switch
before AC 1 can receive multicast messages from AC 2.
# Enable IP multicast routing and IGMP.
<Switch> system-view
[Switch] multicast routing-enable
[Switch] interface vlan-interface 2
[Switch-Vlan-interface2] pim dm
[Switch-Vlan-interface2] quit
[Switch] vlan 3
[Switch-vlan3] port gigabitethernet 1/0/1
[Switch-vlan3] quit
[Switch] interface vlan-interface 3
[Switch-Vlan-interface3] igmp enable
[Switch-Vlan-interface3] quit
[Switch] interface gigabitethernet 1/0/1
[Switch-GigabitEthernet1/0/1] igmp-snooping static-group 224.0.1.1 vlan 3
4) Configuration on AC 1:
# Enable IP multicast routing and IGMP.
<AC1> system-view
[AC1] interface vlan-interface 3
# Configure AC 1 to work in the multicast client mode and receive multicast messages on
VLAN-interface 3.
[AC1-Vlan-interface3] ntp-service multicast-client
# View the NTP status of AC 1 after clock synchronization.
[AC1-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 2005 (C6D95F6F.B6872B02)
As shown above, AC 1 has been synchronized to AC 2, and the clock stratum level of AC 1 is 3, while
that of AC 2 is 2.