H3C Technologies H3C SecBlade LB Cards - Manual (Page 130)

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Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
This command enters the view of
the interface for sending NTP
broadcast messages.
3. Configure the device to
operate in NTP broadcast
server mode.
ntp-service broadcast-server
[ authentication-keyid keyid |
version number ] *
A broadcast server can
synchronize broadcast clients only
when its clock has been
synchronized.
Configuring the NTP multicast mode
The multicast server periodically sends NTP multicast messages to multicast clients, which send replies
after receiving the messages and synchronize their local clocks.
Configure the NTP multicast mode on both the server and clients. The NTP multicast mode must be
configured in a specific interface view.
To configure a multicast client:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
This command enters the view of
the interface for sending NTP
multicast messages.
3. Configure the device to
operate in NTP multicast client
mode.
ntp-service multicast-client
[ ip-address ]
You can configure up to 1024
multicast clients, of which 128 can
take effect at the same time.
To configure the multicast server:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view.
interface interface-type
interface-number
This command enters the view of
the interface for sending NTP
multicast messages.
3. Configure the device to
operate in NTP multicast
server mode.
ntp-service multicast-server
[ ip-address ]
[ authentication-keyid keyid | ttl
ttl-number | version number ] *
A multicast server can synchronize
broadcast clients only when its
clock has been synchronized.
Configuring the local clock as a reference source
A network device can get its clock synchronized in either of the following two ways:
• Synchronized to the local clock, which operates as the reference source.
• 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 selects the optimal clock as the reference source.