Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 6 NTP Configuration Commands
3Com Corporation
6-11
By default, multicast service is not configured, the IP address is 224.0.1.1 and NTP
version 3 is used.
This command specifies the interface to transmit NTP multicast packets. In multicast
server mode, the local device operates as a multicast server to transmit multicast
messages periodically to the multicast clients.
Example
# Configure Ethernet 1/0/0 to transmit NTP multicast messages. Set the multicast
address to 224.0.1.1, encryption key ID to four and NTP version to three.
[3com] interface ethernet 1/0/0
[3com-Ethernet1/0/0] ntp-service multicast-server 224.0.1.1
authentication-keyid 4 version 3
6.1.13 ntp-service refclock-master
Syntax
ntp-service refclock-master [ X.X.X.X ] [ layers-number ]
undo ntp-service refclock-master [ X.X.X.X ]
View
System view
Parameter
X.X.X.X: IP address of the reference clock 127.127.1.u, where u is an integer in the
range 0 to 3.
layers-number: Specifies the stratum of the local clock. It is in the range 1 to 15.
Description
Use the ntp-service refclock-master command to set the local clock as the NTP
master clock to provide synchronization source.
Use the undo ntp-service refclock-master command to remove the setting of the
NTP master clock.
By default, the IP address of reference clock is not specified. In this case, the local
clock is the NTP master clock.
You may set the stratum of the NTP master clock in this command.
By default, the stratum of the local clock is eight.
Example
# Use the local device as the NTP master clock to provide synchronization source for
other peers. Set layers-number to three.