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Huawei Server Maintenance Manual 09

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Common Maintenance Problems of the iBMC NTP Function

Common Maintenance Problems of the iBMC NTP Function

Synchronization Fails After the NTP Function Is Enabled on iBMC

Diagnosis Method
  1. Check whether the problem is a synchronization failure. The NTP synchronization status may not be updated. After the NTP function is enabled on iBMC, the system may not immediately complete NTP synchronization. A few minutes are required for the system to update the NTP synchronization status (failed or successful). The synchronization requires 10 minutes. After the NTP function is enabled for 15 minutes, run the ipmcget –d ntpinfo command on the CLI. If the displayed synchronization status is failed, the NTP synchronization is failed.

  2. Verify that the NTP server address on iBMC is correct.
  3. Verify that iBMC communicates properly with the NTP server.
  4. Verify that the NTP service is enabled on the NTP server. Run the service ntpd status command on the NTP server. If the following information is displayed, the NTP service is enabled.

  5. Check whether port 123 is blocked by the NTP server firewall. The NTP service uses port 123. If port 123 is blocked by the NTP server firewall, the synchronization fails.
  6. Verify that the NTP server connected to iBMC synchronizes time properly with the upper-layer NTP server. The upper-layer NTP synchronization must be normal for iBMC to synchronize time with the connected NTP server. The verification method is as follows:

    Run the ntpq –p command on the connected NTP server. In the command output, check whether each line starts with an asterisk (*). If yes, the upper-layer NTP synchronization is successful.

  7. Perform the following checks:
    1. If iBMC uses an IPv4 NTP server address, verify that iBMC supports IPv4, and that an IPv4 address is configured on iBMC.
    2. If iBMC uses an IPv6 NTP server address, verify that iBMC supports IPv6, and that an IPv6 address is configured on iBMC.
    3. If the NTP server address configured on iBMC is a domain name, verify that the DNS server on the iBMC LAN is configured, and that the DNS server works properly.

      The verification method is as follows:

      On the iBMC WebUI, choose Configure > Network Setting > 3. Set IP Address. View the IP protocol version used by iBMC, and verify that an IP address of the corresponding IP protocol version is configured.

      On the iBMC WebUI, choose Configure > Network Setting > 4. Set DNS. Verify that the DNS server is configured on iBMC.

  8. Perform the following checks:
    1. Check whether Server Authentication is enabled on the NTP server but not enabled on iBMC.
    2. Check whether Server Authentication of the NTP function is enabled on iBMC but not enabled on the NTP server.

    If either of the preceding cases exist, the NTP synchronization fails.

  9. Verify that the clocks of the preferred and alternative NTP servers are consistent (in milliseconds). If not, the iBMC NTP function rejects NTP synchronization. When the clocks of the preferred and alternative NTP servers are inconsistent, iBMC cannot determine which clock is correct. To protect the system from being attacked, the iBMC NTP function rejects NTP synchronization.
  10. After the NTP function is enabled on iBMC, check whether abnormal time jumps occur on the NTP server. If a great difference between the clocks of iBMC and the NTP server is detected, the iBMC NTP function considers that the NTP server may be under attack. To ensure iBMC clock security, the iBMC NTP function rejects NTP synchronization.

Failed to Obtain the NTP Server Address When Automatically Obtaining NTP Information Is Enabled

Diagnosis Method

If Automatically obtain IP address (for IPv4 or IPv6) is enabled on iBMC, verify that the NTP server address is configured on the DHCP server. To enable Automatically obtain NTP information using DHCPv4 or Automatically obtain NTP information using DHCPv6, you must select Automatically obtain IP address (IPv4 or IPv6), and configure the NTP server address for all DHCP servers on the LAN.

iBMC NTP Function Fails to Obtain the Time Zone from the NTP Server

Diagnosis Method

The NTP protocol does not support time zone synchronization. iBMC uses the NTP function to obtain the UTC time from the NTP server. You need to manually configure the time zone on iBMC.

For details, see:

https://www.meinbergglobal.com/english/faq/faq_32.htm

https://serverfault.com/questions/194402/does-ntp-daemon-set-the-host-timezone

https://social.technet.microsoft.com/Forums/Lync/en-US/70fbdde0-94d6-406b-b5dd-f72ca6b024ff/ntp-server-on-two-different-time-zones-est-and-pst?forum=winservergen

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Updated: 2019-02-25

Document ID: EDOC1000041338

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