3Com Switch 7750 Configuration Guide

Configuration of Optional NTP Parameters 761
n
The procedures for configuring NTP authentication on the server are the same as
that on the client. Besides, the client and the server must be configured with the
same authentication key.
Configuration of
Optional NTP
Parameters
The configurations of optional NTP parameters are:
■ Setting the local clock as the NTP master clock
■ Configuring the local VLAN interface that sends NTP packets
■ Configuring the number of the dynamic sessions that can be established locally
■ Disabling the VLAN interface configured on a switch from receiving NTP
packets
■ Disabling NTP service globally
Configure the
specified key to be a
trusted key
ntp-service reliable
authentication-keyid key-id
Required
By default, an authentication key is
not a trusted key
Enter VLAN interface
view
interface interface-type
interface-number
-
Associate a specified
key with the
corresponding NTP
server
Broadcast server mode:
ntp-service broadcast-server
authentication-keyid key-id
■ In NTP broadcast server mode
and NTP multicast server mode,
you need to associate the
specified key with the
corresponding NTP server on
the server
■ You can associate an NTP
server with an authentication
key while configuring a switch
to operate in a specific NTP
mode. You can also associate
them using this command after
configuring the NTP mode
where a switch is to operate
Multicast server mode:
ntp-service multicast-server
authentication-keyid key-id
Table 605 Configure NTP authentication on the server
Operation Command Description
Table 606 Configure optional NTP parameters
Operation Command Description
Enter system view system-view -
Configure the local
clock as the NTP
master clock
ntp-service refclock-master
[ ip-address ] [ stratum ]
Optional
Configure the local
interface that sends
NTP packets
ntp-service source-interface
interface-type interface-number
Optional
Configure the number
of the sessions that
can be established
locally
ntp-service
max-dynamic-sessions number
Optional
By default, up to 100 dynamic
sessions can be established locally.
Enter VLAN interface
view
interface interface-type
interface-number
-