3Com Switch 4200G Configuration Guide

298 CHAPTER 35: NTP CONFIGURATION
Configuring NTP
Authentication
Configuring NTP authentication on the client
■ 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.
Table 259 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 server mode:
ntp-service unicast-server
remote-ip authentication-keyid
key-id
■ In NTP server 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 in.
Peer mode:
ntp-service unicast-peer
remote-ip authentication-keyid
key-id