排除Nexus 9000上的精确时间协议(PTP)故障
简介
本文档 d说明 如何排除Nexus 9000交换机上的精确时间协议(PTP)故障。
先决条件
思科建议您了解以下主题：
- PTP基础知识
- 熟悉Cisco Nexus操作系统(NX-OS)
本文不介绍PTP(Precision Time Protocol)协议的设计和配置。有关此类信息，建议您参考配置指南。
Cisco Nexus控制面板见解的Precision时间协议(PTP)
使用的组件
本文档不限于特定的软件和硬件版本。
本文档中的信息基于以下软件和硬件版本：
- N9K Spine01:N9K-C93180YC-FX NX-OS 10.3(4a)
- N9K Spine02:N9K-C93180YC-EX NX-OS 10.3(4a)
- N9K Leaf01:N9K-C92160YC-X NX-OS 9.3.12
- N9K主机：N9K-C92160YC-X NX-OS 9.3.12
本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您的网络处于活动状态，请确保您了解所有命令的潜在影响。
限制和限制
-
要使PTP正常工作，必须使用最新的SUP和线卡FPGA版本。有关升级FPGA的信息，请访问版本说明登录页，转到FPGA/EPLD升级版本说明（NX-OS模式交换机）部分并找到适用于您的软件版本的FPGA/EPLD升级版本说明。请参阅安装指南主题。
- 在Nexus 9000上，PTP仅在边界时钟模式下运行。不支持端到端透明时钟模式和对等透明时钟模式。
-
Cisco Nexus 92348GC-X平台交换机不支持PTP。
-
QoS TCAM区域Ingress SUP [ingress-sup]必须设置为768或更高，PTP IPv6传输才能正常工作。
在对PTP问题进行故障排除之前，建议查看给定平台和版本的Nexus 9000系统管理配置的PTP部分。
了解PTP
PTP过程包括两个阶段：建立主要和辅助层次结构以及同步时钟。
最佳主时钟算法(BMC)
BMCA用于选择每条链路上的时间源时钟，并最终为整个PTP域选择祖时钟时。它在普通时钟和边界时钟的每个端口上本地运行，将本地数据集与从通告消息接收的数据进行比较，以选择链路上的最佳时钟。
- Priority1：用户可配置的绝对优先级（低值优先）
- Clock Class：定义时钟可追溯性的属性（不可由用户配置，低值优先）
- 时钟准确性：定义时钟的准确性（不可由用户配置，取值更低）
- 时钟差异：定义时钟精度的属性（不可由用户配置）
- 优先级2：用户可配置
- 源端口ID：源端口的Mac地址
通告消息用于建立同步层次结构。
同步时钟
Sync、Delay_Req、Follow_Up和Delay_Resp消息用于计算时间。
PTP消息可以是组播或单播，组播是默认模式。根据IEEE 1588标准，PTP使用组播目标IP地址224.0.1.129 UDP319/320。
PTP配置文件 — PTP支持默认(1588)、AES67和SMPTE 2059-2配置文件。每个配置文件具有不同的同步和延迟请求间隔范围。有关这些配置文件的详细信息，请参阅配置指南。
实验室拓扑结构
基本配置:
feature ptp
ptp source 192.168.1.3>>>>Define PTP packet source IP
ptp priority1 127 >>>>Define PTP priority 1
ptp priority2 127 >>>>Define PTP priority 2
interface Ethernet1/31
ptp >>>>Enable PTP in all interconnected ports.
interface Ethernet1/33
ptp
interface Ethernet1/34
ptp
故障排除步骤：
检验PTP配置是否正确。
确保每台设备都有唯一的源IP，并且所有设备上的PTP域ID相同。
N9K_Spine01# show ptp clock
PTP Device Type : boundary-clock
PTP Source IPv4 Address : 192.168.1.3>>>>PTP source IP
PTP Source IPv6 Address : 0::
Clock Identity : 00:ee:ab:ff:fe:67:3e:9d
Clock Domain: 0 >>>>PTP domain id. Must same in one PTP domain.
Slave Clock Operation : Two-step
Master Clock Operation : Two-step >>>>N9K EX/FX/FX2/FX3 only support two-step mode.
Slave-Only Clock Mode : Disabled
Number of PTP ports: 3
Priority1 : 127
Priority2 : 127
Clock Quality:
Class : 248
Accuracy : 254
Offset (log variance) : 65535
Steps removed : 1 >>>>Hops from GM
验证PTP层次结构设置是否成功。
从端口连接到上游时钟设备。master端口连接到下游设备。
N9K_Spine01# show ptp brief
PTP port status
--------------------------------------------
Port State
-------------------------------------------
Eth1/31 Slave >>>>Connected to GM
Eth1/33 Master >>>>Connected to N9K Spine 2
Eth1/34 Master >>>>Connected to N9K leaf
N9K_Spine02# show ptp brief
PTP port status
--------------------------------------------
Port State
------------------------------- ------------
Eth1/48 Passive >>>>Connected to N9K leaf. The Port should be in the passive state to avoid loop
Eth1/50 Master >>>>Connected to GM02
Eth1/53 Slave >>>>Connected to N9K Spine 1
N9K_Leaf01# show ptp brief
PTP port status
--------------------------------------------
Port State
------------------------------- ------------
Eth1/48 Master >>>>Connected to Spine02
Eth1/50 Master >>>>Connected to host
Eth1/51 Slave >>>>Connected to Spine01
GM01# show system internal ptp info announce-pkts
2024-01-02T13:36:23.242624000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [TX] If Eth1/35 (0x1a004400): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:37:e9-0x89 CORR:0 (0x0) SEQ:bda4 (48548) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:0 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
2024-01-02T13:36:15.238816000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [TX] If Eth1/35 (0x1a004400): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:37:e9-0x89 CORR:0 (0x0) SEQ:bda0 (48544) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:0 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
N9K_Spine01# show system internal ptp info announce-pkts
2024-01-02T13:36:20.826735000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [TX] If Eth1/33 (0x1a004000): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:3e:9d-0x81 CORR:0 (0x0) SEQ:bbfc (48124) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:1 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
2024-01-02T13:36:17.231080000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [TX] If Eth1/34 (0x1a004200): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:3e:9d-0x85 CORR:0 (0x0) SEQ:bdac (48556) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:1 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
2024-01-02T13:36:16.239728000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [RX] If Eth1/31 (0x1a003c00): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:37:e9-0x89 CORR:0 (0x0) SEQ:bda1 (48545) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:0 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
N9K_Spine02# show system internal ptp info announce-pkts
2024-01-02T13:36:21.368978000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [RX] If Eth1/48 (0x1a005e00): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:4c:77:6d:ff:fe:d5:35:35-0xbd CORR:0 (0x0) SEQ:bcd7 (48343) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
2024-01-02T13:36:19.363095000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [TX] If Eth1/50 (0x1a006200): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:c0:14:fe:ff:fe:89:9b:77-0xc5 CORR:0 (0x0) SEQ:00e8 (232) Int:1; TS:0
s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
2024-01-02T13:36:16.828573000+08:00 [M 1] [ptp] E_DEBUG [ptp_ev_hist_ann_pkt:5469] [RX] If Eth1/53 (0x1a006800): MSG: Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:3e:9d-0x81 CORR:0 (0x0) SEQ:bbfa (48122) Int:1; TS
:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:1 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9;
N9K_Leaf01# show system internal ptp info announce-pkts
2024 Jan 02 13:36:23.893622: E_PTP_ANN_PKT_EV[TX] I/f Eth1/50 (0x1a006200): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:4c:77:6d:ff:fe:d5:35:35-0xc5 CORR:0 (0x0) SEQ:1354 (4948) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2
PRIO1:1 PRIO2:1
CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9
2024 Jan 02 13:36:23.369089: E_PTP_ANN_PKT_EV[TX] I/f Eth1/48 (0x1a005e00): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:4c:77:6d:ff:fe:d5:35:35-0xbd CORR:0 (0x0) SEQ:bcd8 (48344) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2
PRIO1:1 PRIO2:1
CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9
2024 Jan 02 13:36:23.233889: E_PTP_ANN_PKT_EV[RX] I/f Eth1/51 (0x1a006400): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:3e:9d-0x85 CORR:0 (0x0) SEQ:bdaf (48559) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:1
PRIO1:1 PRIO2:1
CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9
Host# show system internal ptp info announce-pkts
2024 Jan 02 13:36:23.898218: E_PTP_ANN_PKT_EV[RX] I/f Eth1/50 (0x1a006200): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:4c:77:6d:ff:fe:d5:35:35-0xc5 CORR:0 (0x0) SEQ:1354 (4948) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2
PRIO1:1 PRIO2:1
CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9
| V:2 |
PTP版本2 |
| LEN:64 |
PTP消息长度64 |
| D:0 |
PTP域0 |
| UC:0 |
0:PTP组播数据包，1:PTP单播数据包 |
| 2S:0 |
也许leap 59/61 |
| UTCVAL:0 |
UTC偏移量有效标志。0表示false。GM设定的。 |
| PTPTS:1 |
PTP TimeScale标志。1表示真 |
| TT:0 |
PTP TimeTrace标志。 0表示false |
| FT:0 |
PTP FreqTrace标志。0表示错误 |
| 源： |
PTP数据包源MAC |
| CORR:0 |
更正 |
| 序列号： |
PTP序列ID |
| INT:1 |
日志消息周期。1平均2秒 |
| TS: |
时间戳 |
| UTC_OFF |
UTC偏移值。 GM设置此值。 |
| TM_SRC |
0x20 GPS、0x40 PTP、0x50 NTP、0x60手持设备0xa内置振荡器。 GM设置此值。 |
| 步骤：2 |
两步模式下的时钟操作（N9K仅在主端口上支持两步模式） |
| PRIO1:1 PRIO2:1类：248 ACC:fe LOG_VAR:ffff |
GM优先级、GM时钟等级、GM时钟精度 |
| GM |
GM时钟标识。来自mac地址。 |
验证PTP域中的父级和祖师级信息
确保父时钟设备和根时钟设备是稳定的。
N9K_Spine01# show ptp parent Parent Clock: Parent Clock Identity: 00:ee:ab:ff:fe:67:37:e9 >>>>upstream clock identity. 37:e9 is GM in lab topology Parent Port Number: 137 Observed Parent Offset (log variance): N/A Observed Parent Clock Phase Change Rate: N/A Parent IP: 192.168.1.1 >>>>upstream clock source IP Grandmaster Clock: Grandmaster Clock Identity: 00:ee:ab:ff:fe:67:37:e9 >>>>GM clock identity Grandmaster Clock Quality: >>>>GM clock attributes Class: 248 Accuracy: 254 Offset (log variance): 65535 Priority1: 1 >>>>GM priority1 Priority2: 1
N9K_Spine02# show ptp parent Parent Clock: Parent Clock Identity: 00:ee:ab:ff:fe:67:3e:9d>>>upstream clock identity. 37:9d is N9K Spine01 in lab topology Parent Port Number: 129 Observed Parent Offset (log variance): N/A Observed Parent Clock Phase Change Rate: N/A Parent IP: 192.168.1.3 >>>>upstream clock source IP. 192.168.1.3 is N9K Spine01 Grandmaster Clock: Grandmaster Clock Identity: 00:ee:ab:ff:fe:67:37:e9 Grandmaster Clock Quality: Class: 248 Accuracy: 254 Offset (log variance): 65535 Priority1: 1 Priority2: 1
N9K_Leaf01# show ptp parent PTP PARENT PROPERTIES Parent Clock: Parent Clock Identity: 00:ee:ab:ff:fe:67:3e:9d Parent Port Number: 133 Observed Parent Offset (log variance): N/A Observed Parent Clock Phase Change Rate: N/A Parent IP: 192.168.1.3 Grandmaster Clock: Grandmaster Clock Identity: 00:ee:ab:ff:fe:67:37:e9
Grandmaster Clock Quality: Class: 248 Accuracy: 254 Offset (log variance): 65535 Priority1: 1 Priority2: 1
检验PTP纠正和错误纠正。
Sync-SeqID必须随每个条目增加。校正必须小于10000纳秒(ns)。
N9K_Spine02# show system internal ptp corrections PTP past corrections ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Slave Port SUP Time Correction(ns) MeanPath Delay(ns) MasterTimestamp (sec, nsec) Slave Timestamp (sec, nsec) Sync-SeqID PTPLC ts_corr(ns)
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Eth1/53 Wed Jan 3 15:29:05 2024 15928 -8 204 1704266945 14551936 1704266945 14552148 31871 0 Eth1/53 Wed Jan 3 15:29:04 2024 765051 24 204 1704266944 764413040 1704266944 764413220 31870 0 Eth1/53 Wed Jan 3 15:29:04 2024 509436 24 204 1704266944 513679576 1704266944 513679756 31869 0 Eth1/53 Wed Jan 3 15:29:04 2024 264139 0 204 1704266944 263204688 1704266944 263204892 31868 0 Eth1/53 Wed Jan 3 15:29:04 2024 13239 -8 204 1704266944 12722952 1704266944 12723164 31867 0 Eth1/53 Wed Jan 3 15:29:03 2024 762756 24 212 1704266943 761756520 1704266943 761756708 31866 0
错误更正记录
默认情况下，校正阈值为100000纳秒(100us)。不在此范围内的更正会记录为错误更正。
N9K_Spine02(config)# show system internal ptp bad-corrections PTP past corrections ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Slave Port SUP Time Correction(ns) MeanPath Delay(ns) MasterTimestamp (sec, nsec) Slave Timestamp (sec, nsec) Sync-SeqID PTPLC ts_corr(ns)
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Eth1/48 Tue Jan 2 13:28:30 2024 692911 17111776 172 1704173310 705666212 1704173310 688554608 52942 0 Eth1/48 Tue Jan 2 13:28:30 2024 443146 17111808 172 1704173310 454735796 1704173310 437624160 52941 0 Eth1/48 Tue Jan 2 13:28:30 2024 188850 17111784 172 1704173310 203243428 1704173310 186131816 52940 0 Eth1/48 Tue Jan 2 13:28:29 2024 949432 51292504 172 1704173309 952419348 1704173309 901127016 52939 0
有用的集合：
show running-config ptp
show ptp brief
show ptp counters all
show ptp clock
show system internal ptp info all
show system internal ptp info global
show ptp clock foreign-masters record
show system internal ptp corrections entries 2000
show system internal ptp bad-corrections entries 2000
show system internal ptp trouble-shooting all
show tech ptp
常见问题:
Nexus 9000无法同步时间与根时钟或上游边界时钟
在大多数情况下，这些是配置问题。
要采取的操作：
- 检查所有启用PTP的设备上的PTP域编号是否相同。确保在所有设备上配置了唯一的PTP源IP。
show ptp clock
TP Device Type : boundary-clock
PTP Device Encapsulation : NA
PTP Source IP Address : 192.168.1.4
Clock Identity : c0:14:fe:ff:fe:89:9b:77
Clock Domain: 0
Slave Clock Operation : Two-step
Master Clock Operation : Two-step
<snip>
Local clock time : Thu Jan 4 19:34:26 2024
PTP Clock state : Locked
- 验证接口上是否已启用PTP。默认情况下，该选项处于禁用状态。
N9K_Spine02# show ptp brief
--------------------------------------------
Port State
------------------------------- ------------
Eth1/48 Passive >>>>Connected to N9K leaf. Port in the passive state to prevent loop
Eth1/50 Master >>>>Connected to GM02
Eth1/53 Slave >>>>Connected to N9K Spine 1
- 检查PTP接口参数。确保使用与对等体相同的PTP VLAN。
N9K_Spine02# show ptp port interface e1/48
PTP Port Dataset: Eth1/48
Port identity: clock identity: c0:14:fe:ff:fe:89:9b:77
Port identity: port number: 188
PTP version: 2
Port state: Master
VLAN info: 1
Delay request interval(log mean): 0
Announce receipt time out: 3
Peer mean path delay: 0
Announce interval(log mean): 1
Sync interval(log mean): -2
Delay Mechanism: End to End
Cost: 255
Domain: 0
意外的特级大师切换
2024 Jan 4 19:27:05 N9K_Spine02 %PTP-2-PTP_GM_CHANGE: Grandmaster clock has changed from 00:ee:ab:ff:fe:67:37:e9 to c0:14:fe:ff:fe:a3:c4:67 for the PTP protocol
要采取的操作
- 检查PTP通告历史记录，了解优先级更改或其他时钟属性更改。
show system internal ptp info announce-pkts
2024 Jan 04 19:27:07.408293: E_PTP_ANN_PKT_EV[RX] I/f Eth1/48 (0x1a005e00): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:4c:77:6d:ff:fe:d5:35:35-0xbd CORR:0 (0x0) SEQ:3673 (13939) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9 2024 Jan 04 19:27:06.321569: E_PTP_ANN_PKT_EV[RX] I/f Eth1/50 (0x1a006200): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:c0:14:fe:ff:fe:a3:c4:67-0xc9 CORR:0 (0x0) SEQ:0005 (5) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:0 PRIO1:0 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:c0:14:fe:ff:fe:a3:c4:67 2024 Jan 04 19:27:05.427431: E_PTP_ANN_PKT_EV[RX] I/f Eth1/53 (0x1a006800): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:00:ee:ab:ff:fe:67:3e:9d-0x81 CORR:0 (0x0) SEQ:3593 (13715) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:1 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9 2024 Jan 04 19:27:05.407196: E_PTP_ANN_PKT_EV[RX] I/f Eth1/48 (0x1a005e00): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:4c:77:6d:ff:fe:d5:35:35-0xbd CORR:0 (0x0) SEQ:3672 (13938) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9 2024 Jan 04 19:27:04.822821: E_PTP_ANN_PKT_EV[TX] I/f Eth1/50 (0x1a006200): MSG:Announce TS:0 V:2 LEN:64 D:0 UC:0 2S:0 UTCVAL:0 PTPTS:1 TT:0 FT:0 SRC:c0:14:fe:ff:fe:89:9b:77-0xc4 CORR:0 (0x0) SEQ:0506 (1286) Int:1; TS:0 s 0 ns; UTC_OFF:37 TM_SRC:a0 STEP:2 PRIO1:1 PRIO2:1 CLASS:248 ACC:fe LOG_VAR:ffff GM:00:ee:ab:ff:fe:67:37:e9
高错误更正
由于缺乏数据，随机错误更正可能很难进行分析。Nexus 9000提供自动日志功能，可在后端捕获PTP日志，而不会影响性能。
要采取的操作：
1.识别错误更正。
N9K_Spine02# show system internal ptp bad-corrections entries 2000 ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Slave Port SUP Time Correction(ns) MeanPath Delay(ns) MasterTimestamp (sec, nsec) Slave Timestamp (sec, nsec) Sync-SeqID PTPLC ts_corr(ns)
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Eth1/48 Thu Jan 4 18:41:07 2024 140073 19167640 172 1704364867 151916416 1704364867 132748948 28473 0 Eth1/48 Thu Jan 4 18:41:06 2024 889689 19167624 172 1704364866 901509720 1704364866 882342268 28472 0 Eth1/48 Thu Jan 4 18:41:06 2024 634900 19167604 172 1704364866 651177596 1704364866 632010164 28471 0 Eth1/48 Thu Jan 4 18:41:06 2024 386534 19167636 172 1704364866 399944588 1704364866 380777124 28470 0 Eth1/48 Thu Jan 4 18:41:05 2024 732409 425695900 172 1704364866 148959160 1704364865 723263432 28469 0 Eth1/48 Thu Jan 4 18:41:05 2024 480431 425695932 172 1704364865 898386456 1704364865 472690696 28468 0 Eth1/48 Thu Jan 4 18:41:05 2024 225514 425695908 172 1704364865 647736096 1704364865 222040360 28467 0 Eth1/48 Thu Jan 4 18:41:04 2024 977564 425695924 172 1704364865 396727464 1704364864 971031712 28466 0
2.启用PTP自动日志
test system internal ptp auto-log correction-limit 10000 >> Set a threshold of correction to trigger if the switch starts log collection. In this case, it’s 10000ns
test system internal ptp auto-log file-max-count 5 >> Maximum Auto-log files quantity
no test system internal ptp auto-log file-rollover >> Disable auto-log rollover
test system internal ptp auto-log >> Start auto-log in backend
3.如果发生PTP错误更正，将在bootflash中创建PTP日志。
N9K_Spine02# dir bootflash:
4096 Jan 04 19:57:44 2024 ptp_autolog/
N9K_Spine02# dir ptp_autolog
1115095 Jan 04 19:27:06 2024 auto_ptp_dbg_log_1.log
1099741 Jan 04 19:57:43 2024 auto_ptp_dbg_log_2.log
53631 Jan 04 19:57:43 2024 auto_ptp_dbg_log_3.log
87478 Jan 04 19:57:44 2024 auto_ptp_dbg_log_4.log
在此文件中，可以找到T1-T4以执行计算。
19:26:56 056993 ptp_calc_mean_path_delay t1/m sec 1704367616 ns 54142980 t2/s sec 1704367616 ns 54143180 t3/ds sec 1704367616 ns 54888476 t4/dm sec 1704367616 ns 54888676 diff corr 0 ns
19:26:57 060081 ptp_calc_mean_path_delay t1/m sec 1704367617 ns 56716444 t2/s sec 1704367617 ns 56716636 t3/ds sec 1704367617 ns 57466060 t4/dm sec 1704367617 ns 57466284 diff corr 0 ns
19:26:58 062591 ptp_calc_mean_path_delay t1/m sec 1704367618 ns 59552956 t2/s sec 1704367618 ns 59553164 t3/ds sec 1704367618 ns 60248804 t4/dm sec 1704367618 ns 60249012 diff corr 0 ns
19:26:59 061974 ptp_calc_mean_path_delay t1/m sec 1704367619 ns 61891376 t2/s sec 1704367619 ns 61891632 t3/ds sec 1704367619 ns 62503968 t4/dm sec 1704367619 ns 62504128 diff corr 0 ns
PTP端口在应该是从属或被动时处于主状态
如果PTP端口在RX（接收）路径端遇到消息交换问题，则该端口会变为主状态。
要采取的操作：
- 检查有问题的端口上的PTP RX（接收）计数器是否增
master加。
N9K_Spine01# show ptp counters all PTP Packet Counters of Interface Eth1/31: ---------------------------------------------------------------- Packet Type TX RX ---------------- -------------------- -------------------- Announce 0 3 Sync 0 21 FollowUp 0 21 Delay Request 5 0 Delay Response 0 5
- 如果未增加，请检查SUP重定向ACL（访问控制列表）统计信息。
N9K_Spine01# show system internal access-list sup-redirect-stats | in PTP|Slice
Instance: 0 [Unit: 0 Slice: 0]
3118 PTP EVENT REDIRECT 3358695
3119 ETH PTP EVENT TX TIMESTAMP 0
3120 PTP EVENT TX TIMESTAMP 5046146
3167 PTP MSG REDIRECT 3088156
3183 PTP UNICAST MSG REDIRECT 0
3184 PTP UNICAST EVENT REDIRECT 0
Instance: 1 [Unit: 0 Slice: 1]
3118 PTP EVENT REDIRECT 0
3119 ETH PTP EVENT TX TIMESTAMP 0
3120 PTP EVENT TX TIMESTAMP 0
3167 PTP MSG REDIRECT 0
3183 PTP UNICAST MSG REDIRECT 0
3184 PTP UNICAST EVENT REDIRECT 0
- 检查控制平面策略(CoPP)是否正在丢弃PTP消息。如果此处有丢弃计数器，则验证您的比例。
N9K_Spine01# show policy-map interface control-plane class copp-system-p-class-redirect
Service-policy input: copp-system-p-policy-strict
class-map copp-system-p-class-redirect (match-any)
match access-group name copp-system-p-acl-ptp
match access-group name copp-system-p-acl-ptp-l2
match access-group name copp-system-p-acl-ptp-uc
set cos 1
police cir 280 kbps , bc 32000 bytes
module 1 :
transmitted 875343860 bytes;
5-minute offered rate 1650 bytes/sec
conformed 1932 peak-rate bytes/sec
at Thu Jan 04 22:08:20 2024
dropped 0 bytes; >>>> Check if any counter increasing
5-min violate rate 0 byte/sec
violated 0 peak-rate byte/sec
最佳实践
- 确保所有内容都在同一个PTP域中。
- 链路两端的同步、通告和延迟间隔必须匹配。
- CLI命令可确保枝叶接入端口保持此状态
master，即使收件人配置错误或祖母意外连接到此端口下也是如此：
interface Ethernet1/1
ptp multicast master-only
- 查看经过验证的可扩展性指南，了解每种型号的交换机的最大端口数
master。
相关信息
修订历史记录
| 版本 | 发布日期 | 备注 |
|---|---|---|
1.0 |
07-Feb-2024 |
初始版本 |
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