3Com 4500 PWR 26-Port Configuration Manual page 656

Configuration Procedure
Configuring NTP authentication on the client
Follow these steps to configure NTP authentication on the client:
To do...
Enter system view
Enable the NTP authentication
function
Configure the NTP
authentication key
Configure the specified key as a
trusted key
Associat
Configure on the
e the
client in the
specified
server/client mode
key with
the
Configure on the
correspo
symmetric-active
nding
peer in the
NTP
symmetric peer
server
mode
NTP authentication requires that the authentication keys configured for the server and the client be the
same. Besides, the authentication keys must be trusted keys. Otherwise, the clock of the client cannot
be synchronized with that of the server.
Configuring NTP authentication on the server
Follow these steps to configure NTP authentication on the server:
To do...
Enter system view
Enable NTP authentication
Configure an NTP
authentication key
Use the command...
system-view
ntp-service authentication
enable
ntp-service
authentication-keyid key-id
authentication-model md5
value
ntp-service reliable
authentication-keyid key-id
ntp-service unicast-server
{ remote-ip | server-name }
authentication-keyid key-id
ntp-service unicast-peer
{ remote-ip | peer-name }
authentication-keyid key-id
Use the command...
system-view
ntp-service authentication
enable
ntp-service
authentication-keyid key-id
authentication-mode md5
value
54-12
Remarks
—
Required
Disabled by default.
Required
By default, no NTP
authentication key is
configured.
Required
By default, no trusted key is
configured.
Required
For the client in the NTP
broadcast/multicast mode,
you just need to associate the
specified key with the client
on the corresponding server.
Remarks
—
Required
Disabled by default.
Required
By default, no NTP
authentication key is
configured.