H3C S3100 8C SI User Manual

Operation Manual – NTP
H3C S3100 Series Ethernet Switches Chapter 1 NTP Configuration
1-7
1.3 Configuring NTP Implementation Modes
An S3100 Ethernet switch can work in one of the following NTP modes:
z Configuring NTP Server/Client Mode
z Configuring the NTP Symmetric Peer Mode
z Configuring NTP Broadcast Mode
z 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:
z UDP port 123 is opened only when the NTP feature is enabled.
z UDP port 123 is closed as the NTP feature is disabled.
These functions are implemented as follows:
z Execution of one of the ntp-service unicast-server, ntp-service unicast-peer,
ntp-service broadcast-client, ntp-service broadcast-server, ntp-service
multicast-client, and ntp-service multicast-server commands enables the NTP
feature and opens UDP port 123 at the same time.
z 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 Command Description
Enter system view
system-view
—
Configure an NTP
client
ntp-service unicast-server { remote-ip |
server-name } [ authentication-keyid
key-id | priority | source-interface
Vlan-interface vlan-id | version
number ]*
Required
By default, the
switch is not
configured to work
in the NTP client
mode.

H3C S3100 8C SI Specifications

General

Brand	H3C
Model	S3100 8C SI
Category	Switch
Language	English