3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring NTP Authentication 1075
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After you enable the NTP authentication feature for the client, make sure that you
configure for the client an authentication key that is the same as on the server and
specify that the authentication is trusted; otherwise, the client cannot be
synchronized to the server.
Configuring NTP authentication for a server
Follow these steps to configure NTP authentication for a server:
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The procedure of configuring NTP authentication on a server is the same as that
on a client, and the same authentication key must be configured on both the
server and client sides.
Associate the specified key
with an NTP server
Server/client mode:
ntp-service unicast-server {
ip-address | server-name }
authentication-keyid keyid
Required
Symmetric peers mode:
ntp-service unicast-peer {
ip-address | peer-name }
authentication-keyid keyid
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Enable NTP authentication ntp-service authentication
enable
Required
Disabled by default
Configure an NTP
authentication key
ntp-service
authentication-keyid keyid
authentication-mode md5
value
Required
No NTP authentication key by
default
Configure the key as a trusted
key
ntp-service reliable
authentication-keyid keyid
Required
No authentication key is
configured to be trusted by
default
Enter interface view interface interface-type
interface-number
-
Associate the specified key
with an NTP server
Broadcast server mode:
ntp-service
broadcast-server
authentication-keyid keyid
Required
Multicast server mode:
ntp-service
multicast-server
authentication-keyid keyid