# NTP：服务器203.0.113.1层级16，过高无法同步

- **ID:** `networking/ntp-stratum-too-high`
- **领域:** networking
- **类别:** protocol_error
- **验证级别:** ai_generated
- **修复率:** 85%

## 根因

NTP服务器报告层级值为16，表示它未同步或失去了上游参考时钟，使其无法用作时间源。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| NTP 4.2.8 | active | — | — |
| chrony 4.3 | active | — | — |
| OpenNTPD 6.2 | active | — | — |
| Windows Time Service 10.0 | active | — | — |

## 解决方案

1. ```
   Check the NTP server's upstream connection: on the server, run 'ntpq -p' to verify reachability and stratum of upstream servers, then fix network issues or reconfigure the server to use a reliable upstream
   ```
2. ```
   Switch the client to a different NTP server with a lower stratum, e.g., replace 'server 203.0.113.1' with 'server pool.ntp.org iburst' in /etc/ntp.conf
   ```

## 无效尝试

- **** — The client NTP service is not the problem; the server's stratum is still 16, so the client will continue to reject it. (95% 失败率)
- **** — This may cause the client to use a bad time source, leading to clock drift and potential synchronization issues. (80% 失败率)