Configuration procedure

Assign an IP address to each interface, and make sure Device A and Device B can reach each other, as shown in Figure 44. (Details not shown.)
Configure Device A:
# Enable the NTP service.
```
<DeviceA> system-view
[DeviceA] ntp-service enable
```
# Configure the local clock of Device A as a reference source, with stratum level 2.
```
[DeviceA] ntp-service refclock-master 2
```
# Enable NTP authentication on Device A.
```
[DeviceA] ntp-service authentication enable
```
# Configure an NTP authentication key, with the key ID of 10 and key value of aNiceKey. Input the key in plain text.
```
[DeviceA] ntp-service authentication-keyid 10 authentication-mode md5 simple aNiceKey
```
# Specify the key as a trusted key.
```
[DeviceA] ntp-service reliable authentication-keyid 10
```
Configure Device B:
# Enable the SNTP service.
```
<DeviceB> system-view
[DeviceB] sntp enable
```
# Enable SNTP authentication on Device B.
```
[DeviceB] sntp authentication enable
```
# Configure an SNTP authentication key, with the key ID of 10 and key value of aNiceKey. Input the key in plain text.
```
[DeviceB] sntp authentication-keyid 10 authentication-mode md5 simple aNiceKey
```
# Specify the key as a trusted key.
```
[DeviceB] sntp reliable authentication-keyid 10
```
# Specify Device A as the NTP server of Device B, and associate the server with key 10.
```
[DeviceB] sntp unicast-server 1.0.1.11 authentication-keyid 10
```

Verify the configuration:

# Verify that an SNTP association has been established between Device B and Device A, and Device B has synchronized to Device A.

[DeviceB] display sntp sessions
NTP server     Stratum   Version    Last receive time
1.0.1.11        2         4          Tue, May 17 2011  9:11:20.833 (Synced)

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