3Com Switch 4200G Configuration Guide

Configuration of Optional NTP Parameters 299
Configuring NTP authentication on the server
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
Optional NTP parameters are:
■ The local VLAN interface that sends NTP packets
■ The number of the dynamic sessions that can be established locally
■ Disabling the VLAN interface configured on a switch from receiving NTP packets
Table 260 Configure NTP authentication on the server
Operation Command Description
Enter system view system-view —
Enable NTP
authentication
ntp-service authentication
enable
Required
By default, NTP authentication.
Configure NTP
authentication key
ntp-service
authentication-keyid key-id
authentication-model md5
value
Required
By default, NTP authentication key
is not configured.
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 vlan-interface vlan-id —
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 261 Configure optional NTP parameters
Operation Command Description
Enter system view system-view —
Configure the local
interface that sends
NTP packets
ntp-service source-interface
vlan-interface
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 vlan-interface vlan-id —