3Com Switch 8807, Configuration Manual

Page: 759 / 883

NTP Configuration 759
Key number key - number ranges from 1 to 4294967295
Designating an Interface
to Transmit NTP
Messages
If the local equipment is configured to transmit all the NTP messages, these
packets will have the same source IP address, which is taken from the IP address of
the designated interface.
Perform the following configuration in system view.
An interface is specified by 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 NTP Master
Clock
This configuration task is to set the external reference clock or the local clock as
the NTP master clock.
Perform the following configuration in system view.
ip - address specifies the IP address 127.127.1.u of a reference clock, in which u
ranges from 0 to 3. stratum specifies how many stratums the local clock belongs
to and ranges from 1 to 15.
The IP address defaults 127.127.1.0, and the stratum defaults to 8.
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
with
peer , server , server only , and query only in an ascending order of the
limitation. The first matched authority will be given.
Perform the following configuration in system view.
Table 707 Set the specified key as reliable
Operation Command
Set the specified key as
reliable
ntp-service reliable authentication-keyid key - number
Cancel the specified reliable
key.
undo ntp-service reliable authentication-keyid key - number
Table 708 Designate an interface to transmit NTP messages
Operation Command
Designate an interface to transmit NTP
messages ntp-service source-interface interface - type
interface - number
Cancel the interface to transmit NTP messages undo ntp-service source-interface
Table 709 Set the external reference clock or the local clock as the NTP master clock
Operation Command
Set the external reference clock or the local
clock as the NTP master clock. ntp-service refclock-master [ ip - address ] [
stratum ]
Cancel the NTP master clock settings
undo ntp-service refclock-master [
ip - address ]