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karobar
Asked: 2018-01-12 07:34:53 +0800 CST

NTP Peer 状态的 Select Field 中的 8 表示什么？

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我已经完成ntpq，然后运行associations并收到以下内容：

ind assid status  conf reach auth condition  last_event cnt
===========================================================
  1 12097  c811   yes  none   yes    reject    mobilize  1

从man ntp-decode（Peer Status）的文档中，我了解到第一个数字表示Status，第二个Select，第三个Count和第四个Code。

我试图找到 Select Status本手册的部分并找到以下内容：

The Select Field displays the current selection status. (The T Field in the following table gives the corresponding tally codes used in the ntpq peers dis-
play.) The values are coded as follows:

+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        Code             |            Message                    |            T             |            Description                                      |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        0                |            sel_reject                 |                          |            discarded as not valid (TEST10-TEST13)           |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        1                |            sel_falsetick              |            x             |            discarded by intersection algorithm              |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        2                |            sel_excess                 |            .             |            discarded by table overflow (not used)           |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        3                |            sel_outlyer                |            -             |            discarded by the cluster algorithm               |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        4                |            sel_candidate              |            +             |            included by the combine algorithm                |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        5                |            sel_backup                 |            #             |            backup (more than tos maxclock sources)          |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        6                |            sel_sys.peer               |            *             |            system peer                                      |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+
|        7                |            sel_pps.peer               |            o             |            PPS peer (when the prefer peer is valid)         |
+-------------------------+---------------------------------------+--------------------------+-------------------------------------------------------------+

那么，这个8数字Select Status是什么意思呢？

ntp

1 个回答

  1. Best Answer

    文档中对等状态代码的解释说，状态字段“为 5 位宽，并与 3 位宽的选择字段结合以创建对等状态字的第一个完整字节。” 选择字段是 3 位，所以它只能有 0-7 的值。第 2 位的 8 是状态字段中的最低有效位，而不是选择字段中的最高有效位。

    所以c8表示“持久关联”、“启用身份验证”和“广播关联”（位 0、1 和 4，计算大端序）。您可以ntpq使用readvar命令为您解释这些字段。这是我笔记本电脑的一个示例，它被配置为[0-3].ubuntu.pool.ntp.org在pool模式下使用：

    # ntpq -n
ntpq> peers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 0.ubuntu.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.000
 1.ubuntu.pool.n .POOL.          16 p    -   64    0    0.000    0.000   0.000
...
ntpq> assoc

ind assid status  conf reach auth condition  last_event cnt
===========================================================
  1 32962  8811   yes  none  none    reject    mobilize  1
  2 32963  8811   yes  none  none    reject    mobilize  1
...
ntpq> readvar 32962
associd=32962 status=8811 conf, bcast, sel_reject, 1 event, mobilize,
srcadr=0.0.0.0, srcport=0, srchost="0.ubuntu.pool.ntp.org",
dstadr=0.0.0.0, dstport=0, leap=11, stratum=16, precision=-24,
rootdelay=0.000, rootdisp=0.000, refid=POOL,
reftime=00000000.00000000  Thu, Feb  7 2036 16:28:16.000,
...

    请注意“conf”（永久配置关联）和“bcast”（广播关联），它们是状态字段的简短解释。（显然，当它具有 POOL 的 refid 时，广播不仅仅意味着广播。）

    • 2

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