# 8.华三交换机配置NTP

## 1 组网需求

如[图1](https://www.h3c.com/cn/d_202012/1371466_30005_0.htm#_Ref256147451)所示，网络中有一台时间服务器Device A，为网络中的其它设备提供精确的时间服务，为保证网络中的所有设备能保持一致、统一的时钟，现要求配置NTP服务器/客户端模式，使所有设备能从时间服务器Device A上获得时钟同步。

图1 配置NTP服务器/客户端模式组网图

![img](https://pic.chjina.com/2023/06/01/20201231_5475298_image001_1371466_30005_0.png)

## 2 配置步骤

### 1 Device A的配置

\# 配置NTP客户端，接受公网NTP校时。

\# 设置DNS

\[DeviceA] dns server 223.5.5.5

\# 开启NTP功能。

ntp-service enable

\# 通过NTP协议获取时间

\[DeviceA] clock protocol ntp

\# 设置时区为东八区

\[DeviceA] clock timezone BeiJing add 8

\# 设置NTP服务器地址

ntp-service unicast-server ntp.chjina.com

\# 设置本地时钟作为参考时钟，层数为2。

\[DeviceA] ntp-service refclock-master 2

### 2 Device B的配置

\# 配置接口的IP地址，配置步骤这里省略。

\# 开启NTP功能。

system-view

\[DeviceB] ntp-service enable

\# 设置NTP Server为Device B的时间服务器。

\[DeviceB] ntp-service unicast-server 1.0.1.11

## 3 验证配置

\# 以上配置完成后，Device B向Device A进行时间同步。查看NTP的运行状态。

```
[DeviceB] display ntp-service status
 Clock status: synchronized 
 Clock stratum: 3
 System peer: 1.0.1.11   
 Local mode: client     
 Reference clock ID: 1.0.1.11
 Leap indicator: 00     
 Clock jitter: 0.003479 s  
 Stability: 0.000 pps    
 Clock precision: 2^-19    
 Root delay: 1.95313 ms   
 Root dispersion: 28.38135 ms
 Reference time: d5ed8cd5.577006ea Wed, Sep 25 2019 16:24:53.341
```

此时Device B已经与Device A同步，层数比Device A的层数大1，为3。

\# 查看Device B的NTP会话信息，可以看到Device B与Device A建立了连接。

```
[DeviceB] display ntp-service sessions
​     source     reference    stra reach poll now offset delay disper
********************************************************************************
[12345]1.0.1.11    127.127.1.0    2  255  64  38 -10.22 1.9531 3.3416
Notes: 1 source(master), 2 source(peer), 3 selected, 4 candidate, 5 configured.
 Total sessions: 1
```

## 配置文件

· Device A上的配置

```
interface Vlan-interface2
 ip address 1.0.1.11 255.255.255.0
 dns server 223.5.5.5
 clock protocol ntp
 clock timezone BeiJing add 8
 ntp-service enable 
 ntp-service  refclock-master 2
 ntp-service unicast-server ntp.chjina.com
 ntp-service unicast-server 182.92.12.11
```

· Device B上的配置

```
interface Vlan-interface2
 ip address 1.0.1.12 255.255.255.0
 ntp-service enable
 ntp-service unicast-server 1.0.1.11
```

参考:

{% embed url="<https://www.h3c.com/cn/d_202201/1535193_30005_0.htm#_Toc93421431>" %}


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