H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – NTP
H3C S7500E Series Ethernet Switches Chapter 1 NTP Configuration
1-13
II. Configuring the multicast server
To do… Use the command… Remarks
Enter system view
system-view
—
Enter interface view
interface interface-type
interface-number
Enter the interface
used to send NTP
multicast message
Configure the device to
work in the NTP multicast
server mode
ntp-service multicast-server
[ ip-address ]
[ authentication-keyid keyid |
ttl ttl-number | version
number ] *
Required
 Note:
z A multicast server can synchronize broadcast clients only after its clock has been
synchronized.
z You can configure up to 1024 multicast clients, among which 128 can take effect at
the same time.
1.3 Configuring the Local Clock as a Reference Source
A network Switch Can get its clock synchronized in one of the following two ways:
z Synchronized to the local clock, which as the reference source.
z Synchronized to another device on the network in any of the four NTP operation
modes previously described.
If you configure two synchronization modes, the device will choose the optimal clock as
the reference source.
Follow these steps to configure the local clock as a reference source:
To do… Use the command… Remarks
Enter system view
system-view
—
Configure the local clock
as a reference source
ntp-service refclock-master
[ ip-address ] [ stratum ]
Required
 Note:
In this command, ip-address must be 127.127.1.u, where u ranges 0 to 3, representing
the NTP process ID.