3Com Switch 7750 Configuration Guide Guide

702 CHAPTER 66: NTP CONFIGURATION
performed on the server (assuming that the related configurations are
performed).
■ You need to couple the NTP authentication with a trusted key.
■ The configurations performed on the server and the client must be the same.
■ A client with NTP authentication enabled is only synchronized to a server that
can provide a trusted key.
Configuring NTP
Authentication
Configuring NTP authentication on the client
n
■ NTP authentication requires that the authentication keys configured for the
server and the client are the same. Besides, the authentication keys must be
trusted keys. Otherwise, the client cannot be synchronized with the server.
■ In NTP server mode and NTP peer mode, you need to associate the specified
key with the corresponding NTP server/active peer on the client/passive peer. In
these two modes, multiple servers/active peers may be configured for a
client/passive peer, and a client/passive choose the server/active peer to
synchronize to by the authentication key.
Tabl e 545 Configure NTP authentication on the client
Operation Command Description
Enter system view system-view -
Enable NTP authentication
globally
ntp-service authentication
enable
Required
By default, the NTP
authentication is disabled
Configure the NTP
authentication key
ntp-service
authentication-keyid key-id
authentication-model md5
value
Required
By default, the 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, no trusted
authentication key is
configured
Associate the specified key
with the corresponding NTP
server
NTP client mode:
ntp-service unicast-server {
remote-ip | server-name }
authentication-keyid key-id
■ In NTP client mode and
NTP peer mode, you need
to associate the specified
key with the
corresponding NTP server
on the client.
■ You can associate the NTP
server with the
authentication key while
configuring the switch to
operate in a specific NTP
mode. You can also
associate them using this
command after
configuring the NTP mode
where the switch is to
operate
Peer mode:
ntp-service unicast-peer {
remote-ip | peer-name }
authentication-keyid key-id