954 CHAPTER 77: NTP CONFIGURATION
Configuring NTP
Server/Client Mode
For switches working in the server/client mode, you only need to make
configurations on the clients, and not on the servers.
Follow these steps to configure an NTP client:
n
■ In the ntp-service unicast-server command, ip-address must be a host
address, rather than a broadcast address, a multicast address or the IP address
of the local clock.
■ When the interface sending the NTP packet is specified by the
source-interface argument, the source IP address of the NTP packet will be
configured as the primary IP address of the specified interface.
■ A switch can act as a server to synchronize the clock of other switches only
after its clock has been synchronized. If the clock of a server has a stratum level
higher than or equal to that of a client’s clock, the client will not synchronize its
clock to the server’s.
■ You can configure multiple servers by repeating the ntp-service
unicast-server command. The clients will choose the optimal reference
source.
Configuring the NTP
Symmetric Mode
For switches working in the symmetric mode, you need to specify a
symmetric-passive on a symmetric-active peer.
Following these steps to configure a symmetric-active switch:
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■ In the symmetric mode, you should use any NTP configuration command in
“Configuring the Operation Modes of NTP” on page 953 to enable NTP;
otherwise, a symmetric-passive peer will not process NTP packets from a
symmetric-active peer.
■ In the ntp-service unicast-peer command, ip-address must be a host
address, rather than a broadcast address, a multicast address or the IP address
of the local clock.
■ When the interface used to send NTP messages is specified by the
source-interface argument, the source IP address of the NTP message will be
configured as the primary IP address of the specified interface.
To do… Use the command… Remarks
Enter system view system-view -
Specify an NTP server
for the switch
ntp-service unicast-server { ip-address |
server-name } [ authentication-keyid keyid |
priority | source-interface interface-type
interface-number | version number ] *
Required
No NTP server is
specified by
default.
To do… Use the command… Remarks
Enter system view system-view -
Specify a
symmetric-passive
peer for the switch
ntp-service unicast-peer { ip-address |
peer-name } [ authentication-keyid keyid |
priority | source-interface interface-type
interface-number | version number ] *
Required
No symmetric-passive
peer is specified by
default.
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