3Com 7700 Configuration Manual page 321

Perform the following configurations in system view.
Table 74 Designate an interface to transmit NTP message
Operation
Designate an interface to transmit NTP
message
Cancel the interface to transmit NTP message undo ntp-service source-interface
An interface is specified by interface-name or interface-type interface-number. The
source address of the packets will be taken from the IP address of the interface. If
the ntp-service unicast-server or ntp-service unicast-peer command also
designates a transmitting interface, use the one designated by them.
Setting the NTP Master Clock
This configuration task is sets the external reference clock or the local clock as the
NTP master clock.
Perform the following configurations in system view.
Table 75 Set the External Reference Clock or the Local Clock as the NTP Master Clock
Operation
Set the external reference clock or the local
clock as the NTP master clock.
Cancel the NTP master clock settings
ip-address specifies the IP address 127.127.t.u of a reference clock, in which t
ranges from 0 to 37 and u ranges from 0 to 3. stratum specifies how many strata
the local clock belongs to and ranges from 1 to 15. If no IP address is specified, the
system defaults to setting the local clock as the NTP master clock. You can specify
the stratum parameter.
Enabling/Disabling an Interface to Receive the NTP Message
This configuration task is enables or disables an interface to receive the NTP
message.
Perform the following configurations in VLAN interface view.
Table 76 Enable/Disable an Interface to Receive NTP Message
Operation
Disable an interface to receive NTP message
Enable an interface to receive NTP message
This configuration task must be performed on the interface to be disabled to
receive NTP message.
Setting Authority to Access a Local Switch
Set authority to access the NTP services on a local switch. This is a basic and brief
security measure, compared to authentication. An access request will be matched
Command
ntp-service source-interface {
interface-name | interface-type
interface-number }
Command
ntp-service refclock-master [ ip-address ] [
stratum ]
undo ntp-service refclock-master [
ip-address ]
Command
ntp-service in-interface disable
undo ntp-service in-interface disable
NTP 41