R21xx-HP FlexFabric 11900 Network Management and Monitoring Command Reference
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Usage guidelines
After you configure this command, the device periodically sends NTP messages to the specified multicast
address.
If you have configured the device to operate in multicast server mode on an interface with this command,
do not add the interface to any aggregate group. To add the interface to an aggregate group, remove
the configuration of the command.
Examples
# Configure the device to operate in multicast server mode and send NTP multicast messages on
VLAN-interface 1 to the multicast address 224.0.1.1, using key 4 for encryption, and set the NTP version
to 4.
<Sysname> system-view
[Sysname] interface vlan-interface 1
[Sysname-Vlan-interface1] ntp-service multicast-server 224.0.1.1 version 4
authentication-keyid 4
Related commands
ntp-service multicast-client
ntp-service refclock-master
Use ntp-service refclock-master to configure the local clock as a reference source for other devices.
Use undo ntp-service refclock-master to remove the configuration.
Syntax
ntp-service refclock-master [ ip-address ] [ stratum ]
undo ntp-service refclock-master [ ip-address ]
Default
The device does not use its local clock as a reference clock.
Views
System view
Predefined user roles
network-admin
Parameters
ip-address: IP address of the local clock, which is 127.127.1.u, where u is the NTP process ID in the range
of 0 to 3. If you do not specify ip-address, i t d e f a u l t s t o 127.127.1.0 .
stratum: Stratum level of the local clock, in the range of 1 to 15. The default value is 8. A lower stratum
level represents a higher clock accuracy.
Usage guidelines
Usually an NTP server that gets its time from an authoritative time source, such as an atomic clock has
stratum 1 and operates as the primary time server to provide time synchronization for other devices in the
network. The accuracy of each server is the stratum, with the topmost level (primary servers) assigned as
one and each level downwards (secondary servers) in the hierarchy assigned as one greater than the
preceding level.