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[All About Switches] An Exception Occurs When Clock Synchronization Is Performed on an S Series Switch Functioning as the NTP Client

Latest reply: Jun 3, 2018 14:01:17 1669 2 0 0 0

Involved Products and Versions

S series switches running V200R003


An S series switch is connected to a Cisco device. The switch functions as the NTP client, and the Cisco device functions as the NTP server.

Fault Symptom

When NTP clock synchronization is performed on the S series switch, an exception occurs and clock synchronization fails frequently.

Cause Analysis

When the Cisco device functions as the NTP server, the value of the root delay field (system delay) in the command output is 5.217s, which is greater than that of the S series switch. When the value of root delay exceeds the fixed threshold of the switch, the S series switch functioning as the NTP client does not synchronize the clock of the NTP server.

Troubleshooting Procedure

1.         Collect information about the live network and obtain information about NTP interaction packets. The command output shows that the value of the root delay field is 5.217s and the maximum threshold of the system delay for the S series switch is 1s.

2.         Upgrade the system software to V200R005 or a later version, and then run the ntp-service max-distance command to change the threshold (the threshold cannot be modified in V200R003 of S series switches).

<HUAWEI> system-view
[HUAWEI] ntp-service max-distance 16                  

Conclusions and Suggestions

In this example, the NTP clock synchronization on the S series switch is abnormal because the delay between the non-Huawei switch and device is large. When non-Huawei devices are connected to S series switches, pay attention to the differences between the implementation of S series switches and that of non-Huawei devices. In addition, pay attention to the differences among different versions of S series switches.

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Created Mar 15, 2018 06:03:04

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MVE Created Jun 3, 2018 14:01:17

useful document, thanks
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