Catalyst 9000交换机上的精确时间协议(PTP)故障排除

已更新: 2023 年 10 月 10 日

文档 ID:221062

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简介

本文档介绍如何对Catalyst 9000交换机上的精确时间协议(PTP)进行故障排除。

先决条件

要求

Cisco 建议您了解以下主题：

了解精确时间协议(PTP)

使用的组件

本文档中的信息基于Catalyst 9300、9400、9500和9600交换机。

Cat9300#show module
Switch  Ports    Model                Serial No.   MAC address     Hw Ver.       Sw Ver. 
------  -----   ---------             -----------  --------------  -------       --------
 1       65     C9300-48T             FCW2236C0WC  700b.4fa8.5280  V02           17.03.05      
Cat9300#

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。

规则

有关文档规则的详细信息，请参阅 Cisco 技术提示规则。

限制和限制

Catalyst 9200交换机不支持PTP。
Stackwise中的Catalyst 9300不支持PTP。例如，如果堆栈中有2-8台交换机，则不支持PTP。
Stackwise-Virtual中的Catalyst 9400、9500或9600交换机不支持PTP。

有关Catalyst 9000的PTP限制和限制的详尽列表，请参阅给定平台和版本的第2层配置指南的PTP部分。

Cisco Catalyst交换机支持Precision时间协议常见问题

术语

期限	定义
大师级时钟(GMC)	在PTP域内，祖母时钟是使用PTP进行时钟同步的主要时间源。大师级时钟通常具有非常精确的时间源，例如GPS或原子钟。当网络不需要任何外部时间参考且仅需要在内部同步时，祖时钟可以自由运行。
普通时钟(OC)	普通时钟是具有单个PTP端口的PTP时钟。它用作PTP网络中的节点，可以被BMCA选为子域内的主节点或从节点。普通时钟是PTP网络中最常见的时钟类型，因为它们用作连接到需要同步的设备的网络中的终端节点。普通时钟与外部设备具有不同的接口。
边界时钟(BC)	PTP网络中的边界时钟代替标准网络交换机或路由器运行。边界时钟有多个PTP端口，每个端口都提供对单独PTP通信路径的访问。边界时钟提供PTP域之间的接口。它们会拦截和处理所有PTP消息，并传递所有其他网络流量。边界时钟使用BMCA选择任何端口看到的最佳时钟。然后，将选定端口设置为从端口。主端口与下游连接的时钟同步，而从端口与上游主时钟同步。
透明时钟(TC)	PTP网络中透明时钟的作用是更新PTP事件消息中的时间间隔字段。此更新补偿了交换机延迟，其准确度在1皮秒内。透明时钟有两种类型：
端到端(E2E)透明	测量SYNC和DELAY_REQUEST消息的PTP事件消息传输时间（也称为驻留时间）。此测量的传输时间将添加到相应消息中的数据字段（更正字段）：测量的SYNC消息的传输时间会添加到相应的SYNC或FOLLOW_UP消息的校正字段中。测量的DELAY_REQUEST消息的传输时间被添加到相应的DELAY_RESPONSE消息的校正字段中。
点对点(P2P)透明	如上所述，使用E2E透明时钟的相同方法测量PTP事件消息传输时间。此外，P2P透明时钟可测量上行链路延迟。上行链路延迟是估计的上行邻居P2P透明时钟和P2P透明时钟之间的数据包传播延迟。这两次（消息中转时间和上行链路延迟时间）都添加到PTP事件消息的校正字段，从设备接收的消息的校正字段包含所有链路延迟的总和。理论上，这是SYNC数据包的端到端总延迟（从主到从）。

PTP时钟故障同步

一般故障点

导致在接口（传输中）或控制平面策略(CoPP)上缓冲或丢弃PTP数据包的网络拥塞。
防火墙拦截PTP数据包。
耗尽硬件资源，例如CPU、内存或TCAM。
硬件或软件限制，无法精确测量时间。

要执行的操作：

检查Cat9k PTP常见问题页面

特定故障点

通告和发现

症状	可能的原因
普通时钟CPU不处理来自GMC的通告数据包。普通时钟不发送“延迟请求”数据包。在PTP协商后，时钟无法同步。	Grandmaster Clock未配置为发送Announce packets。PTP Packets lost in transit.PTP packets dropped by Interface、Control-Plane或ASIC。错误配置导致GMC发送错误的PTP域/配置文件，或者Ordinary Clock配置了错误的域/配置文件。

要采取的操作：

验证PTP配置和状态：

执行接口或控制平面EPC以验证时钟正在接收和发送PTP数据包：

如果EPC不可靠，请使用PTP调试收集的数据验证正在发送和接收的PTP值：

最佳主时钟算法(BMCA)

症状	可能的原因
同步失败忽略或拒绝来自GMC的PTP消息的时钟日志记录错误重新同步尝试	网络设备和GMC之间的PTP版本不兼容。Announce packets中的时钟数据不准确。同一域中的多个Grand Master时钟导致时钟不稳定。

要采取的操作：

排除可能造成延迟或不准确时间保持的任何中转时钟或边界时钟。

排除平台上的任何硬件或软件限制，以免精确计时。

收集PTP调试并检查是否存在任何错误。

大师级时钟选择

症状	可能的原因
	最佳主时钟算法(BMCA)不选择最准确的GMC。BMCA不计算网络延迟。优先级设置不匹配。

要采取的操作：

同步消息交换

症状	可能的原因
	透明时钟(TC)配置错误，例如PTP配置文件或模式不正确。延迟计算中的错误。同步消息数据包在传输中或OC的控制平面上丢弃。

要采取的操作：

延迟请求和响应

症状	可能的原因
	透明时钟无法计算精确的时间戳，从而导致不准确的延迟计算。延迟请求或响应数据包以不正确的顺序接收、在传输中丢失或在控制平面之前丢弃

要采取的操作：

更正和同步

症状	可能的原因
	时钟计算出的时间修正和延迟补偿不准确。硬件或软件限制导致不正确的系统时钟调整，从而导致同步失败。

要采取的操作

PTP命令行界面Show命令

验证PTP模式、配置文件、身份、域、启用PTP的接口和PTP接口状态：

Cat9300#show ptp clock
 PTP CLOCK INFO
  PTP Device Type: Unknown 
  PTP Device Profile: Default Profile 
  Clock Identity: 0x70:B:4F:FF:FE:A8:52:80 
  Clock Domain: 0 
  Network Transport Protocol: 802.3
  Number of PTP ports: 0 
Cat9300#

没有PTP配置的接口仍处于域0中并处于INITIALIZING状态。

Cat9300#show ptp brief
Interface                       Domain    PTP State
GigabitEthernet1/0/1            0         INITIALIZING

这是端到端透明模式下时钟的过渡阶段。

Cat9300#configuration terminal
Cat9300(config)#interface twe1/0/1
Cat9300(config-if)#shut
Cat9300(config-if)#no shut
Cat9300(config-if)#end
%LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to down

Cat9300#show ptp brief | i 1/0/1
Interface                       Domain    PTP State
TwentyFiveGigE1/0/1             8         FAULTY 

%LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to up

Cat9300#show ptp brief | i 1/0/1
Interface                       Domain    PTP State
TwentyFiveGigE1/0/1             8         LISTENING    

%LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to up

Cat9300#show ptp brief | i 1/0/1
Interface                       Domain    PTP State
TwentyFiveGigE1/0/1             8         UNCALIBRATED    
 
Cat9300#show ptp brief | i 1/0/1
Interface                       Domain    PTP State
TwentyFiveGigE1/0/1             8         SLAVE

Cat9300#show platform software fed switch active ptp debugs interface twe1/0/1 
Offload Monitor Data:
=======================================

Ofld sig cnt: 0, Ofld ts cnt: 0, Ofld miss cnt: 0, Ofld issue hit: 0 
Sig (rd,wr)ptr: (0,0), Nif (rd,wr)ptr: (0,0)
Drop counters:
=======================================

ptp messages dropped due to qos drain count : 0

Cat9300#show platform software fed switch active ifm mappings 
Interface                 IF_ID    Inst Asic Core Port SubPort Mac  Cntx LPN  GPN  Type Active
TwentyFiveGigE1/0/1       0x9        0   0   0    0      0      7    8    1    1    NRU  Y
<>
Cat9300#show platform software fed switch active ptp if-id 0x009
Displaying port data for if_id 9
=======================================

Port Mac Address 9C:54:16:AE:4C:81
Port Clock Identity 9C:54:16:FF:FE:AE:4C:80
Port number 1
PTP Version 2
domain_value 8
Profile Type: : DEFAULT
Clock Mode : TRANSPARENT CLOCK E2E
Delay mechanism: End-to-End
port_enabled: TRUE
ptt_port_enabled: TRUE
Port state: : SLAVE
sync_seq_num 52439
delay_req_seq_num 0
ptp vlan is valid : TRUE
ptp vlan id 10
port mode 2
tag native vlan : FALSE
num sync messages transmitted  0
num followup messages transmitted  0
num sync messages received  4434
num followup messages received  4434
num delay requests transmitted  0
num delay responses received 0
num delay requests received  0
num delay responses transmitted  0

Cat9300#show platform software fed switch active ptp domain 
Displaying data for domain number 8
=======================================

Profile Type : DEFAULT
Profile State: enabled
Clock Mode : TRANSPARENT CLOCK E2E
Delay Mechanism: : END-TO-END
PTP clock : 1970-1-1 1:45:13
mean_path_delay 0 nanoseconds
Transport Method : 802.3
Message general ip dscp  : 59
Message event ip dscp    : 47

Cat9300#show platform software fed switch active  ptp auto-calibrate 
PTP Auto Calibration:

PTP auto_calibration status : FALSE

C9300-4c80#ptp calibrate interface twe1/0/1 speed all 
%SYS-5-CONFIG_P: Configured programmatically by process PTP protocol engine from console as vty0
%PTP_RP_MODULE-6-PTP_AUTO_CALIBRATION_COMPLETE: PTP auto calibration on the interface TwentyFiveGigE1/0/1 is complete
%SYS-5-CONFIG_P: Configured programmatically by process PTP protocol engine from console as vty0

检查平台资源

检查接口
PTP数据包路径中的输入丢弃、输出丢弃或CRC错误的非零值会导致故障。

Cat9300#show interfaces twe1/0/1 human-readable 
TwentyFiveGigE1/0/1 is up, line protocol is up (connected) 
  Hardware is Twenty Five Gigabit Ethernet, address is 9c54.16ae.4c81 (bia 9c54.16ae.4c81)
  MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec, 
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Full-duplex, 10Gb/s, link type is auto, media type is SFP-10GBase-CX1
  input flow-control is on, output flow-control is unsupported 
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 3.0 kilobits , 5 pps 
  5 minute output rate 0 bits/sec, 0 packets/sec
     26,497 packets input, 1,955,114 bytes, 0 no buffer
     Received 26,477 broadcasts (26,476 multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 26,476 multicast, 0 pause input
     0 input packets with dribble condition detected
     947 packets output, 124,533 bytes, 0 underruns
     Output 17 broadcasts (917 multicasts)
     0 output errors, 0 collisions, 3 interface resets
     2 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out

检查控制平面策略

PTP数据包通过低延迟队列进行处理。PTP流量与其他网络流量类型共享策略器索引，因此最好验证控制平面上没有递增丢包。

Cat9300#show platform hardware fed switch active qos queue stats internal cpu policier 

                         CPU Queue Statistics                  
============================================================================================
                                              (default) (set)     Queue        Queue
QId PlcIdx  Queue Name                Enabled   Rate     Rate      Drop(Bytes)  Drop(Frames)
--------------------------------------------------------------------------------------------
0    11     DOT1X Auth                  Yes     1000      1000     0            0          
1    1      L2 Control                  Yes     2000      2000     0            0          
2    14     Forus traffic               Yes     4000      4000     0            0          
3    0      ICMP GEN                    Yes     600       600      0            0          
4    2      Routing Control             Yes     5400      5400     0            0          
5    14     Forus Address resolution    Yes     4000      4000     0            0          
6    0      ICMP Redirect               Yes     600       600      0            0          
7    16     Inter FED Traffic           Yes     2000      2000     0            0          
8    4      L2 LVX Cont Pack            Yes     1000      1000     0            0          
9    19     EWLC Control                Yes     13000     13000    0            0          
10   16     EWLC Data                   Yes     2000      2000     0            0          
11   13     L2 LVX Data Pack            Yes     1000      1000     0            0          
12   0      BROADCAST                   Yes     600       600      0            0          
13   10     Openflow                    Yes     200       200      0            0          
14   13     Sw forwarding               Yes     1000      1000     0            0          
15   8      Topology Control            Yes     13000     13000    0            0          
16   12     Proto Snooping              Yes     2000      2000     0            0          
17   6      DHCP Snooping               Yes     400       400      0            0          
18   13     Transit Traffic             Yes     1000      1000     0            0          
19   10     RPF Failed                  Yes     200       200      0            0          
20   15     MCAST END STATION           Yes     2000      2000     0            0          
21   13     LOGGING                     Yes     1000      1000     0            0          
22   7      Punt Webauth                Yes     1000      1000     0            0          
23   18     High Rate App               Yes     13000     13000    0            0          
24   10     Exception                   Yes     200       200      0            0          
25   3      System Critical             Yes     1000      1000     0            0          
26   10     NFL SAMPLED DATA            Yes     200       200      0            0          
27   2      Low Latency                 Yes     5400      5400     0            0  <<< Queue for PTP traffic.         
28   10     EGR Exception               Yes     200       200      0            0          
29   5      Stackwise Virtual OOB       Yes     8000      8000     0            0          
30   9      MCAST Data                  Yes     400       400      0            0          
31   3      Gold Pkt                    Yes     1000      1000     0            0          

* NOTE: CPU queue policer rates are configured to the closest hardware supported value

                      CPU Queue Policer Statistics               
====================================================================
Policer    Policer Accept   Policer Accept  Policer Drop  Policer Drop
  Index         Bytes          Frames        Bytes          Frames
-------------------------------------------------------------------
0          4052             48              0             0          
1          3520420          10686           0             0          
2          1966076          16634           0             0     <<< PTP packets share this Policier Index w/other network traffic.      
3          0                0               0             0          
4          0                0               0             0          
5          0                0               0             0          
6          0                0               0             0          
7          0                0               0             0          
8          2937088          45892           0             0          
9          0                0               0             0          
10         1770             15              0             0          
11         0                0               0             0          
12         0                0               0             0          
13         20246            191             0             0          
14         24918            252             0             0          
15         0                0               0             0          
16         0                0               0             0          
17         0                0               0             0          
18         0                0               0             0          
19         0                0               0             0          

                  Second Level Policer Statistics             
====================================================================
20         8423584          73212           0             0          
21         50986            506             0             0          

Policer Index Mapping and Settings
--------------------------------------------------------------------
level-2   :   level-1                      (default)   (set) 
PlcIndex  :   PlcIndex                       rate      rate 
--------------------------------------------------------------------
20        :   1  2  8                        13000     13000
21        :   0 4 7 9 10 11 12 13 14 15      6000      6000
====================================================================

               Second Level Policer Config                        
====================================================================
    level-1 level-2                            level-2
QId PlcIdx  PlcIdx  Queue Name                 Enabled
--------------------------------------------------------------------
0    11      21      DOT1X Auth                  Yes
1    1       20      L2 Control                  Yes
2    14      21      Forus traffic               Yes
3    0       21      ICMP GEN                    Yes
4    2       20      Routing Control             Yes
5    14      21      Forus Address resolution    Yes
6    0       21      ICMP Redirect               Yes
7    16      -       Inter FED Traffic           No 
8    4       21      L2 LVX Cont Pack            Yes
9    19      -       EWLC Control                No 
10   16      -       EWLC Data                   No 
11   13      21      L2 LVX Data Pack            Yes
12   0       21      BROADCAST                   Yes
13   10      21      Openflow                    Yes
14   13      21      Sw forwarding               Yes
15   8       20      Topology Control            Yes
16   12      21      Proto Snooping              Yes
17   6       -       DHCP Snooping               No 
18   13      21      Transit Traffic             Yes
19   10      21      RPF Failed                  Yes
20   15      21      MCAST END STATION           Yes
21   13      21      LOGGING                     Yes
22   7       21      Punt Webauth                Yes
23   18      -       High Rate App               No 
24   10      21      Exception                   Yes
25   3       -       System Critical             No 
26   10      21      NFL SAMPLED DATA            Yes
27   2       20      Low Latency                 Yes
28   10      21      EGR Exception               Yes
29   5       -       Stackwise Virtual OOB       No 
30   9       21      MCAST Data                  Yes
31   3       -       Gold Pkt                    No 
<>

检查CPU和内存

Cat9300#show platform resources 
**State Acronym: H - Healthy, W - Warning, C - Critical                                             
Resource                 Usage                 Max             Warning         Critical        State
----------------------------------------------------------------------------------------------------
 Control Processor       1.28%                 100%            90%             95%             H    
  DRAM                   3566MB(47%)           7575MB          85%             90%             H    
  TMPFS                  1001MB(13%)           7575MB          40%             50%             H    

show processes cpu sorted | ex 0.00
show cpu history 
show processes memory sorted

检查TCAM

Cat9300#show platform hardware fed switch active fwd-asic resource tcam utilization 
Codes: EM - Exact_Match, I - Input, O - Output, IO - Input & Output, NA - Not Applicable

CAM Utilization for ASIC  [0]
 Table                  Subtype      Dir      Max     Used    %Used       V4       V6     MPLS    Other
 ------------------------------------------------------------------------------------------------------
 Mac Address Table      EM           I       32768       20    0.06%        0        0        0       20
 Mac Address Table      TCAM         I        1024       21    2.05%        0        0        0       21
 L3 Multicast           EM           I        8192        0    0.00%        0        0        0        0
 L3 Multicast           TCAM         I         512        9    1.76%        3        6        0        0
 L2 Multicast           EM           I        8192        0    0.00%        0        0        0        0
 L2 Multicast           TCAM         I         512       11    2.15%        3        8        0        0
 IP Route Table         EM           I       24576       12    0.05%       11        0        1        0
 IP Route Table         TCAM         I        8192       25    0.31%       12       10        2        1
 QOS ACL                TCAM         IO       5120       85    1.66%       28       38        0       19
 Security ACL           TCAM         IO       5120      129    2.52%       26       58        0       45
 Netflow ACL            TCAM         I         256        6    2.34%        2        2        0        2
 PBR ACL                TCAM         I        1024       22    2.15%       16        6        0        0
 Netflow ACL            TCAM         O         768        6    0.78%        2        2        0        2
 Flow SPAN ACL          TCAM         IO       1024       13    1.27%        3        6        0        4
 Control Plane          TCAM         I         512      282   55.08%      130      106        0       46 <<< Expected to be at least 50%
 Tunnel Termination     TCAM         I         512       18    3.52%        8       10        0        0
 Lisp Inst Mapping      TCAM         I        2048        1    0.05%        0        0        0        1
 Security Association   TCAM         I         256        4    1.56%        2        2        0        0
 CTS Cell Matrix/VPN
 Label                  EM           O        8192        0    0.00%        0        0        0        0
 CTS Cell Matrix/VPN
 Label                  TCAM         O         512        1    0.20%        0        0        0        1
 Client Table           EM           I        4096        0    0.00%        0        0        0        0
 Client Table           TCAM         I         256        0    0.00%        0        0        0        0
 Input Group LE         TCAM         I        1024        0    0.00%        0        0        0        0
 Output Group LE        TCAM         O        1024        0    0.00%        0        0        0        0
 Macsec SPD             TCAM         I         256        2    0.78%        0        0        0        2

平台工具

执行嵌入式数据包捕获(EPC)

配置EPC

Cat9300#monitor capture tac [interface | control-plane] [in | out | both] [match | access-list] buffer size 100

注意：有关用于EPC的更多配置选项，请查看给定平台/版本的《网络管理配置指南》。

在接口级别验证Rx PTP数据包

Cat9300#monitor capture tac interface twe1/0/1 in match any buffer size 100 
Cat9300#monitor capture tac start
Started capture point : tac
%BUFCAP-6-ENABLE: Capture Point tac enabled.
C9300-4c80#monitor capture stop
Capture statistics collected at software:
        Capture duration - 3 seconds
        Packets received - 28
        Packets dropped - 0
        Packets oversized - 0

Bytes dropped in asic - 0

Capture buffer exists till exported or cleared

Stopped capture point : tac
%BUFCAP-6-DISABLE: Capture Point tac disabled.
C9300-4c80#show monitor capture tac buffer brief | i PTP
    2   0.032858 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message
   12   1.032894 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message
   15   2.032831 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message
   28   3.033414 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message

检验Rx数据包是否到达控制平面

Cat9300#monitor capture cpu control-plane in match any buffer size 100
Cat9300#monitor capture cpu start
Started capture point : cpu
Cat9300#
*Sep 28 14:05:28.375: %BUFCAP-6-ENABLE: Capture Point cpu enabled.
Cat9300#

验证控制平面级别的Tx PTP数据包

这表示Cisco IOS-XE软件和CPU正在生成Rx PTP数据包。

注意：下一跳交换机或SPAN/RSPAN上的入口EPC更可靠，可以验证本地普通时钟正在发送PTP数据包。

注意：在物理接口上配置了EPC的情况下，出口上不会看到CPU生成的数据包（如“ ”），这是EPC工具的书面限制。

Cat9300#monitor capture cpu control-plane out match any buffer size 100
Cat9300#monitor capture cpu start

收集PTP调试

调试	目的
自动校准
bmc	显示选择哪个接口
消息

自动校准调试

21:41:12.543: %LINK-5-CHANGED: Interface TwentyFiveGigE1/0/1, changed state to administratively down
21:41:13.542: %LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to down
21:41:13.543: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to down
1:41:29.714: Autocalibration: No autocalibration is progress (status - 0) or linkup interface TwentyFiveGigE1/0/1 different from autocalibrtion interface No interface
21:41:30.118: %SYS-5-CONFIG_I: Configured from console by console
21:41:31.714: %LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to down
21:41:35.821: %LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to up
21:41:37.824: %LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to up
21:41:37.824: Autocalibration: No autocalibration is progress (status - 0) or linkup interface TwentyFiveGigE1/0/1 different from autocalibrtion interface No interface
21:41:38.849: Autocalibration: No autocalibration is progress (status - 0) or linkup interface Vlan10 different from autocalibrtion interface No interface
21:41:39.849: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up

bmc debug

21:41:12.543: %LINK-5-CHANGED: Interface TwentyFiveGigE1/0/1, changed state to administratively down
21:41:13.542: %LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to down
21:41:13.543: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to down
21:41:30.118: %SYS-5-CONFIG_I: Configured from console by console
21:41:31.714: %LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to down
21:41:35.821: %LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to up
21:41:37.824: %LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to up
21:41:39.849: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up
21:41:40.277:  Set  gmc interface: TwentyFiveGigE1/0/1 <<<

消息debug

Cat9300#clear logging
Cat9300#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Clear logging buffer [confirm]
Cat9300(config)#
Cat9300(config)#int twe1/0/1
Cat9300(config-if)#shut
Cat9300(config-if)#end
Cat9300#
Cat9300#debug ptp messages 
PTP Messages debugging is on
Cat9300#
Cat9300#conf  t
Enter configuration commands, one per line.  End with CNTL/Z.
Cat9300(config)#interface twe1/0/1
Cat9300(config-if)#no shut
Cat9300(config-if)#end
Cat9300#
Cat9300#show ptp bri | i 1/0/1
TwentyFiveGigE1/0/1             8         FAULTY          
        

Cat9300#show ptp bri | i 1/0/1
TwentyFiveGigE1/0/1             8         LISTENING       
          
Cat9300#show ptp bri | i 1/0/1
TwentyFiveGigE1/0/1             8         UNCALIBRATED    
         
Cat9300#show ptp bri | i 1/0/1
TwentyFiveGigE1/0/1             8         SLAVE           
     
        
Cat9300#undebug all
All possible debugging has been turned off
Cat9300#
Cat9300#show logging
<>
Log Buffer (131072 bytes):

21:59:06.980: %LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to down
21:59:07.826: %SYS-5-CONFIG_I: Configured from console by console
21:59:11.271: %LINK-3-UPDOWN: Interface TwentyFiveGigE1/0/1, changed state to up
21:59:12.976: Cisco IOS-FMAN-PTP:retrieve interface: Twe1/0/1 iif_id: 9(fmanrp_ptp_port_data_update)  ptp port data:  <<< local data sent by clock  
           if_hdl = 9
           mac address = 9c54.16ae.4c81 <<< similar to local clock identity 
           domain_value = 8
           port_number = 1
           port_state = 4
           port_enabled = 1
           ptt_port_enabled = 1
           delete_flag = False

21:59:12.976: ####ptp_port_data PTP_SHIM_TDL_MSG####:
message@ptp_port_data: {
  ptp_port_data@ptp_port_data: {
    if_hdl@U32:9
    domain_value@U8:8
    clk_identity[0]@U8:156
    clk_identity[1]@U8:84
    clk_identity[2]@U8:22
    clk_identity[3]@U8:255
    clk_identity[4]@U8:254
    clk_identity[5]@U8:174
    clk_identity[6]@U8:76
    clk_identity[7]@U8:128
    intf_mac@tdl_mac_addr: {
      mac[0]@U8:156
      mac[1]@U8:84
      mac[2]@U8:22
      mac[3]@U8:174
      mac[4]@U8:76
      mac[5]@U8:129
    }
    port_number@U8:1
    sync_interval_96_32@U64:5
    sync_interval_31_0@U32:57005
    pdelay_req_avg_interval@U8:0
    port_state@U8**MSG 00030 TRUNCATED**
**MSG 00030 CONTINUATION #01**:4
    port_enabled@U8:1
    ptt_port_enabled@U8:1
    sync_interval@I8:0
    delay_req_interval@I8:0
    pdelay_req_interval@I8:0
    ptp_vlan_id@U16:10
    ptp_vlan_id_valid@tdl_boolean:TDL_TRUE
    port_mode@U8:2
    tag_native_vlan@tdl_boolean:TDL_FALSE
    ip_addr@U32:168430083
    transport_protocol@U8:3
    virtual_slot@U8:0
    virtual_port@U16:0
    peer_clk_ip@U32:0
    vrf_id@U32:0
    clk_idty_port_num@U16:1
    ptp_dest_mac_non_forwardable@tdl_boolean:TDL_FALSE
  }
  cfg_action@cfg_action:MCP_CFG_ACTION_NONE
}


21:59:13.273: %LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to up <<<
21:59:13.846:  dst mac 1 (cond1)
21:59:13.846:  received message on TwentyFiveGigE1/0/1 <<< 
21:59:13.846: PTP message received, intf: TwentyFiveGigE1/0/1, type: ANNOUNCE
21:59:14.329: Cisco IOS-FMAN-PTP:retrieve interface: Twe1/0/1 iif_id: 9(fmanrp_ptp_port_data_update)  ptp port data:           
           if_hdl = 9           
           mac address = 9c54.16ae.4c81           
           domain_value = 8
           port_number = 1
           port_state = 8
           port_enabled = 1
           ptt_port_enabled = 1
           delete_flag = False

21:59:14.329: ####ptp_port_data PTP_SHIM_TDL_MSG####:
message@ptp_port_data: {
  ptp_port_data@ptp_port_data: {
    if_hdl@U32:9
    domain_value@U8:8
    clk_identity[0]@U8:156
    clk_identity[1]@U8:84
    clk_identity[2]@U8:22
    clk_identity[3]@U8:255
    clk_identity[4]@U8:254
    clk_identity[5]@U8:174
    clk_identity[6]@U8:76
    clk_identity[7]@U8:128
    intf_mac@tdl_mac_addr: {
      mac[0]@U8:156
      mac[1]@U8:84
      mac[2]@U8:22
      mac[3]@U8:174
      mac[4]@U8:76
      mac[5]@U8:129
    }
    port_number@U8:1
    sync_interval_96_32@U64:5
    sync_interval_31_0@U32:57005
    pdelay_req_avg_interval@U8:0
    port_state@U8**MSG 00031 TRUNCATED**
**MSG 00031 CONTINUATION #01**:8
    port_enabled@U8:1
    ptt_port_enabled@U8:1
    sync_interval@I8:0
    delay_req_interval@I8:0
    pdelay_req_interval@I8:0
    ptp_vlan_id@U16:10
    ptp_vlan_id_valid@tdl_boolean:TDL_TRUE
    port_mode@U8:2
    tag_native_vlan@tdl_boolean:TDL_FALSE
    ip_addr@U32:168430083
    transport_protocol@U8:3
    virtual_slot@U8:0
    virtual_port@U16:0
    peer_clk_ip@U32:0
    vrf_id@U32:0
    clk_idty_port_num@U16:1
    ptp_dest_mac_non_forwardable@tdl_boolean:TDL_FALSE
  }
  cfg_action@cfg_action:MCP_CFG_ACTION_NONE
}


21:59:14.845:  dst mac 1 (cond1)
21:59:14.846:  received message on TwentyFiveGigE1/0/1
21:59:14.846: PTP message received, intf: TwentyFiveGigE1/0/1, type: ANNOUNCE
21:59:15.845:  dst mac 1 (cond1)
21:59:15.845:  received message on TwentyFiveGigE1/0/1
21:59:15.845: PTP message received, intf: TwentyFiveGigE1/0/1, type: ANNOUNCE
21:59:15.976: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan10, changed state to up
21:59:16.775:  Set  gmc interface: TwentyFiveGigE1/0/1 <<<
21:59:16.776: Cisco IOS-FMAN-PTP:
 instance_conf data:
           instance_id = 0
           profile_type = 0
           profile_domain = 8
           clock_mode   = 3
           enable = 1
           is_gm = 0
           clocksource = 160
                gm_capable = 1
                gm_present = 1
           neighbor_prop_delay_threshold = 800 ns
           transport_protocol = 3
           delay_mech = 1
           scm_module_num = 1
           delete_flag = False

21:59:16.776: ####ptp_domain_config PTP_SHIM_TDL_MSG####:
message@ptp_domain_config: {
  ptp_domain_cfg@ptp_domain_cfg: {
    value@U8:0
    profile_type@U8:0
    enable@U8:1
    is_gm@U8:0
    priority2@U8:8
    clocksource@U8:160
    gm_capable@U8:1
    neighbor_prop_delay_threshold@U64:800
    clock_mode@U8:3
    pdelay_mechanism@U8:0
    gm_present@U8:1
    delay_mech@U8:1
    transport_protocol@U8:3
    master_module_num@U32:1
  }
  cfg_action@cfg_action:MCP_CFG_ACTION_NONE
}


Cat9300#

执行Show Platform Forward(SPF)

如果看到PTP数据包到达接口但未传送到控制平面，请运行此工具。

1. Configure ingress EPC on PTP enabled interface.  

2. View buffer output and filter for PTP and make note of PTP packet number. 
Cat9300#show monitor capture tac buffer brief | i PTP
    2   0.032858 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message <<<
   12   1.032894 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message
   15   2.032831 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message
   28   3.033414 74:8f:c2:dc:b0:63 -> 01:1b:19:00:00:00 PTPv2 82 Announce Message

3. Export buffer to .pcap on Switch's flash. 
Cat9300-4c80#monitor capture tac export location flash:/ptp-cpu.pcap

4. Execute the SPF command and make note of interface where PTP packets are expected to ingress and reference the packet number from buffer brief command. 
Cat9300#show platform hardware fed switch active forward interface twe1/0/1 pcap flash:ptp-cpu.pcap number 2 data 
Show forward is running in the background. After completion, syslog can be generated.

4. View Forward/Drop decision
Cat9300#show platform hardware fed switch active forward last summary 
Input Packet Details:
###[ Ethernet ]###
  dst       = 01:1b:19:00:00:00
  src=74:8f:c2:dc:b0:63
  type      = 0x8100
###[ 802.1Q ]###
     prio      = 0
     id        = 0
     vlan      = 10
     type      = 0x88f7
###[ Raw ]###
        load      = '0B 02 00 40 08 00 00 08 00 00 00 00 00 00 00 00 00 00 00 00 74 8F C2 FF FE DC B0 60 00 03 0B 11 05 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80 F8 FE 43 6A 80 74 8F C2 FF FE DC B0 60 00 00 A0'
Ingress: 
   Port                      : TwentyFiveGigE1/0/1
   Global Port Number        : 1
   Local Port Number         : 1
   Asic Port Number          : 0
   Asic Instance             : 0
   Vlan                      : 10
   Mapped Vlan ID            : 5
   STP Instance              : 3
   BlockForward              : 0
   BlockLearn                : 0
   L3 Interface              : 38
       IPv4 Routing          : enabled
       IPv6 Routing          : enabled
       Vrf Id                : 0
   Adjacency:                 
       Station Index         : 172
       Destination Index     : 21151
       Rewrite Index         : 1
       Replication Bit Map   : 0xa    ['localCpu', 'remoteCpu']
   Decision:                  
       Destination Index     : 21151  [DI_CPUQ_LOW_LATENCY]
       Rewrite Index         : 1      [RI_CPU]
       Dest Mod Index        : 0      [IGR_FIXED_DMI_NULL_VALUE]
       CPU Map Index         : 0      [CMI_NULL]
       Forwarding Mode       : 0      [Bridging]
       Replication Bit Map   :        ['localCpu', 'remoteCpu']
       Winner                :        CPPMAC LOOKUP2
       Qos Label             : 65
       SGT                   : 0
       DGTID                 : 0
Egress: 
   Possible Replication      : 
       Port                  : CPU_Q_LOW_LATENCY <<< This should be the forwarding decision to this CPU queue. Any drops are unexpected and should be investigated. 
   Output Port Data          : 
     Port                    : CPU
       Asic Instance         : 0
       CPU Queue             :     27 [CPU_Q_LOW_LATENCY]
       Unique RI             : 0
       Rewrite Type          : 0      [Unknown]
       Mapped Rewrite Type   : 17     [CPU_ENCAP]
       Vlan                  : 10
       Mapped Vlan ID        : 5
********************************************************************************

C9300-4c80#

执行Packet Tracer(PT)

Catalyst 9000上的PTP警告

ID	标题思科漏洞ID
思科漏洞ID CSCvg24999	在ptp模式p2ptransparent上交换机崩溃。
思科漏洞ID CSCwf81913	PTP停止在Catalyst交换机上工作，端口进入未校准的状态。
思科漏洞ID CSCwa49052	PTP偏移和平均路径延迟可能滞留在故障交换机上，并且永远不会增加。思科漏洞ID
思科漏洞ID CSCvu73652	C9300 — 丢弃源端口不等于319的PTP事件消息。 Cisco Bug ID
思科漏洞ID CSCwc35946	在8275.1、802.1AS和默认PTP配置文件之间更改时，CLI选项不一致。
思科漏洞ID CSCwc00050	无法通过Web UI更改PTP模式

Catalyst 9000交换机上的精确时间协议(PTP)故障排除

非歧视性语言

关于此翻译

目录

简介

先决条件

要求

使用的组件

规则

限制和限制

术语

PTP时钟故障同步

一般故障点

特定故障点

要采取的操作

PTP命令行界面Show命令

检查平台资源

平台工具

执行嵌入式数据包捕获(EPC)

收集PTP调试

执行Show Platform Forward(SPF)

执行Packet Tracer(PT)

Catalyst 9000上的PTP警告

相关信息

修订历史记录

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