3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring the Operation Modes of NTP 1071
n
A broadcast server can synchronize broadcast clients only after its clock has been
synchronized.
Configuring NTP
Multicast Mode
If using the multicast mode, you need to configure both the server and clients. The
multicast server periodically sends NTP multicast messages to multicast clients. The
commands for the NTP multicast mode must be configured in the specific
interface view. You can configure a maximum of 1,024 multicast clients, among
which 128 can take effect at the same time.
Configuring a multicast client
Follow these steps to configure an NTP multicast client:
Configuring the multicast server
Follow these steps to configure the NTP multicast server:
n
A multicast server can synchronize broadcast clients only after its clock has been
synchronized.
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
Required
Enter the interface used to
send NTP broadcast messages
Configure the device to work
in the NTP broadcast server
mode
ntp-service
broadcast-server [
authentication-keyid keyid |
version number ]*
Required
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
Required
Enter the interface used to
receive NTP multicast
messages
Configure the device to work
in the NTP multicast client
mode
ntp-service multicast-client
[ ip-address ]
Required
The multicast IP address must
be 224.0.1.1.
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
Required
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