H3C Technologies H3C SecBlade LB Cards - Manual (Page 129)

119
Configuring the NTP symmetric peers mode
Follow these guidelines when you configure the NTP symmetric peers mode:
• For devices operating in symmetric mode, specify a symmetric-passive peer on a symmetric-active
peer.
• Use the ntp-service refclock-master command or any NTP configuration command in Configuring
NTP operation modes to enable NTP. Otherwise, a symmetric-passive peer does not process NTP
messages from a symmetric-active peer.
• Either the symmetric-active peer or the symmetric-passive peer must be in synchronized state.
Otherwise, clock synchronization does not proceed.
• After you specify the source interface for NTP messages by specifying the source interface
source-interface option, the source IP address of the NTP messages is set as the primary IP address
of the specified interface.
To specify a symmetric-passive peer on the active peer:
Step Command Remarks
1. Enter system view. system-view N/A
2. Specify a symmetric-passive
peer for the device.
ntp-service unicast-peer
{ ip-address | peer-name }
[ authentication-keyid keyid |
priority | source-interface
interface-type interface-number |
version number ] *
By default, no symmetric-passive
peer is specified.
The ip-address argument must be a
unicast address, rather than a
broadcast address, a multicast
address, or the IP address of the
local clock.
Configuring the NTP broadcast mode
The broadcast server periodically sends NTP broadcast messages to the broadcast address
255.255.255.255. After receiving the messages, the device operating in NTP broadcast client mode
sends a reply and synchronizes its local clock.
Configure the NTP broadcast mode on both the server and clients. The NTP broadcast mode can only be
configured in a specific interface view because an interface needs to be specified on the broadcast
server for sending NTP broadcast messages and on each broadcast client for receiving broadcast
messages.
To configure a broadcast 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
broadcast messages.
3. Configure the device to
operate in NTP broadcast
client mode.
ntp-service broadcast-client N/A
To configure the broadcast server: