某局点S6805-54HF NTP同步失败问题处理经验案例

组网不涉及

设备作为客户端找服务器同步时间失败

查看设备时间异常，但是查看同步状态显示又已同步：

和同步正常的客户端对比配置未见异常：

clock timezone BJ add 08:00:00

clock protocol ntp

ntp-service enable

ntp-service source M-GigabitEthernet0/0/0

ntp-service unicast-server X.X.X.X vpn-instance OOB priority

ntp-service unicast-server X.X.X.X vpn-instance OOB

确认网络中没有其他NTP服务器后在设备上Debugging ntp-service all查看同步过程：

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ACL: Access restrict: 0x00000008.

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/AUTH: Received a packet at 15790995, from X.X.X.X, mode 4, key ID 00000000, length 48, authentication result 0

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/PARAM: Clock filter param: number 8, offset 700663072.709299, delay 0.000084, dispersion 0.004191, jitter 0.000572, burst 0

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: endpoint -1, 700663072.703395

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: endpoint -1, 700663072.706161

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: endpoint  0, 700663072.709299

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: endpoint  0, 700663072.709794

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: endpoint  1, 700663072.713427

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: endpoint  1, 700663072.715203

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: peer X.X.X.X, offset 700663072.709794, low 700663072.706161, high 700663072.713427, flags 00000421

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: peer X.X.X.X, offset 700663072.709299, low 700663072.706161, high 700663072.713427, flags 00000401

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: Survivor X.X.X.X, distance 1.000526

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: Survivor X.X.X.X, distance 1.000921

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: Combine offset 700663072.709794164, jitter 0.000318697

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SYNCH: Synchronized to peer X.X.X.X

*Jul  3 02:26:40:857 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/SELECT: Clock update at 15790995, sample 15790950, session ID 43494, offset 700663072.709794

*Jul  3 02:26:40:858 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ADJUST: One-off system time adjustment failed. Error: Success

*Jul  3 02:26:41:855 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ADJUST: Failed to adjust system time.

*Jul  3 02:26:42:855 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ADJUST: Failed to adjust system time.

*Jul  3 02:26:43:855 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ADJUST: Failed to adjust system time.

*Jul  3 02:26:44:855 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ADJUST: Failed to adjust system time.

*Jul  3 02:26:45:855 2001 DC01-ECC-TOR25-5FJFBC09 NTP/7/ADJUST: Failed to adjust system time.

查看过程发现NTP报文交互正常，但是在调整系统时间时返回码为Error: Success，怀疑为C2538 CPU 浮点寄存器污染问题导致NTP下底层设置时间失败。

MPU(M) Slot 1:

Uptime is 25 weeks,6 days,12 hours,58 minutes

H3C S6805-54HF MPU(M) with 1 C2538 Processor(s)

可以先手动修改系统时间，然后再重启NTP进程尝试恢复，重启NTP进程无影响

Probe视图下：

process restart name ntpd slot 1

process restart name ntpd slot 2