Configuring Ntp Implementation Modes; Configuring Ntp Server/Client Mode - H3C S3100 8C SI Operation Manual

Operation Manual – NTP
H3C S3100 Series Ethernet Switches

1.3 Configuring NTP Implementation Modes

An S3100 Ethernet switch can work in one of the following NTP modes:

Configuring NTP Server/Client Mode

Configuring the NTP Symmetric Peer Mode
Configuring NTP Broadcast Mode
Configuring NTP Multicast Mode
Note:
To protect unused sockets against attacks by malicious users and improve security,
H3C S3100 series Ethernet switches provide the following functions:
UDP port 123 is opened only when the NTP feature is enabled.
UDP port 123 is closed as the NTP feature is disabled.
These functions are implemented as follows:
Execution of one of the ntp-service unicast-server, ntp-service unicast-peer,
ntp-service
multicast-client, and ntp-service multicast-server commands enables the NTP
feature and opens UDP port 123 at the same time.
Execution of the undo form of one of the above six commands disables all
implementation modes of the NTP feature and closes UDP port 123 at the same
time.
1.3.1 Configuring NTP Server/Client Mode
For switches working in the server/client mode, you only need to perform configurations
on the clients, and not on the servers.
Table 1-3 Configure an NTP client
Operation
Enter system view
Configure an NTP
client
broadcast-client, ntp-service
Command
system-view
ntp-service unicast-server { remote-ip |
server-name } [ authentication-keyid
key-id | priority | source-interface
Vlan-interface vlan-id | version
number ]*
1-7
Chapter 1 NTP Configuration
broadcast-server, ntp-service
Description
—
Required
By default, the
switch is not
configured to work
in the NTP client
mode.