Configuring Ntp Implementation Modes; Configuring Ntp Server/Client Mode - H3C S5100-SI Series Operation Manual

Operation Manual – NTP
H3C S5100-SI/EI Series Ethernet Switches
Displaying NTP Configuration

1.3 Configuring NTP Implementation Modes

An S5100-SI/EI 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 S5100-SI/EI 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.
Task
broadcast-client, ntp-service
1-7
Chapter 1 NTP Configuration
Remarks
Optional
broadcast-server, ntp-service