Configuring Ntp Server/Client Mode; Configuring The Ntp Symmetric Mode - 3Com MSR 50 Series Configuration Manual

2056 C 111: NTP C
HAPTER
Configuring NTP
Server/Client Mode
n
Configuring the NTP
Symmetric Mode
n
ONFIGURATION
upon the receipt of a message, rather than creating an association (static or
dynamic). In the symmetric mode, static associations will be created at the
symmetric-active peer side, and dynamic associations will be created at the
symmetric-passive peer side; In the broadcast or multicast mode, static
associations will be created at the server side, and dynamic associations will be
created at the client side.
For devices 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:
To do... Use the command...
Enter system system-view
view
Specify an NTP ntp-service unicast-server [ vpn-instance
server for the vpn-instance-name ] { ip-address | server-name }
device [ authentication-keyid keyid | priority |
source-interface interface-type interface-number |
version number ] *
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 device can act as a server to synchronize the clock of other devices 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.
For devices 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 device:
To do... Use the command...
Enter system system-view
view
Specify a ntp-service unicast-peer [ vpn-instance
symmetric-passi vpn-instance-name ] { ip-address | peer-name }
ve peer for the [ authentication-keyid keyid | priority |
device source-interface interface-type interface-number |
version number ] *
In the symmetric mode, you should use the ntp-service refclock-master
■
command or any NTP configuration command in
Remarks
-
Required
No NTP server is
specified by
default.
Remarks
-
Required
No NTP server is
specified by
default.
"Configuring the Operation