Contents

Introduction

Prerequisites

Requirements

Components Used

Conventions

Restrictions and Limitations

Terminology

PTP Clock Failure Synchronization

Caused by:

Specific Failure Points

Action(s) to Take

PTP Command Line Interface Show Commands

Check Platform Resources

Platform Tools

Perform an Embedded Packet Capture (EPC)

Collect PTP Debugs

Perform a Show Platform Forward (SPF)

Perform a Packet Tracer (PT)

PTP Caveats on Catalyst 9000

Related Information

Introduction

This document describes how to troubleshoot the Precision Time Protocol (PTP) on Catalyst 9000 switches.

Prerequisites

Requirements

Cisco recommends that you have knowledge of this topic:

- Precision Time Protocol (PTP)

Components Used

The information in this document is based on Catalyst 9300, 9400, 9500, and 9600 switches.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to Cisco Technical Tips and Conventions.

Restrictions and Limitations

- PTP is not supported on Catalyst 9200 switches, but is supported on C9200CX switches starting 17.14.01.

- PTP is not supported on Catalyst 9300 switches that are in Stackwise deployment until 17.06.01.

- PTP is not supported on Catalyst 9400, 9500, or 9600 switches in Stackwise-Virtual until 17.10.01

Support for Precision Time Protocol on Cisco Catalyst Switches FAQ

For an exhaustive list of restrictions and limitations for PTP for the Catalyst 9000, review the PTP section of the Layer 2 Configuration Guide for the given platform and version.

Terminology

Term

Definition

Grandmaster Clock (GMC)

Within a PTP domain, the grandmaster clock is the primary source of time for clock synchronization using PTP. The grandmaster clock usually has a very precise time source, such as a GPS or atomic clock. When the network does not require any external time reference and only needs to be synchronized internally, the grandmaster clock can free run.

Ordinary Clock (OC)

An ordinary clock is a PTP clock with a single PTP port. It functions as a node in a PTP network and can be selected by the BMCA as a master or slave within a subdomain. Ordinary clocks are the most common clock type on a PTP network because they are used as end nodes on a network that is connected to devices requiring synchronization. Ordinary clocks have various interface to external devices.

Boundary Clock (BC)

A boundary clock in a PTP network operates in place of a standard network switch or router. Boundary clocks have more than one PTP port, and each port provides access to a separate PTP communication path. Boundary clocks provide an interface between PTP domains. They intercept and process all PTP messages, and pass all other network traffic. The boundary clock uses the BMCA to select the best clock seen by any port. The selected port is then set as a slave. The master port synchronizes the clocks connected downstream, while the slave port synchronizes with the upstream master clock.

Transparent Clock (TC)

The role of transparent clocks in a PTP network is to update the time-interval field that is part of the PTP event message. This update compensates for switch delay and has an accuracy of within one picosecond.There are two types of transparent clocks:

End-to-end (E2E) transparent

Measures PTP event message transit time (also known as resident time ) for SYNC and DELAY_REQUEST messages. This measured transit time is added to a data field (correction field) in the corresponding messages:

- The measured transit time of a SYNC message is added to the correction field of the corresponding SYNC or the FOLLOW_UP message.

- The measured transit time of a DELAY_REQUEST message is added to the correction field of the corresponding DELAY_RESPONSE message.

Peer-to-peer (P2P) transparent

Measures PTP event message transit time in the same way E2E transparent clocks do, as described above. In addition, P2P transparent clocks measure the upstream link delay. The upstream link delay is the estimated packet propagation delay between the upstream neighbor P2P transparent clock and the P2P transparent clock under consideration. These two times (message transit time and upstream link delay time) are both added to the correction field of the PTP event message, and the correction field of the message received by the slave contains the sum of all link delays. In theory, this is the total end-to-end delay (from master to slave) of the SYNC packet.

PTP Clock Failure Synchronization

Caused by:

- Network congestion leading to PTP packets being buffered or dropped on interface (in transit) or by control-plane policing (CoPP).

- Firewalls blocking PTP packets.

- Exhaustion of hardware resources such as CPU, Memory, or TCAM.

- Hardware or software limitation that prevents precise time measurement.

Action to take:

Check the Cat9k PTP FAQ Page

Review show command troubleshoot flow

Specific Failure Points

Announce and Discovery

Symptom

Possible Cause

Ordinary Clock CPU does not process Announce Packets from GMC. Ordinary Clock does not send Delay Request packet.Clocks fail to synchronize after PTP negotiation.

Grandmaster Clock not configured to send Announce packets.PTP Packets lost in transit. PTP packets dropped by Interface, Control-Plane, or ASIC. Misconfiguration that causes GMC to send incorrect PTP domain/profile or Ordinary Clock has incorrect domain/profile configured.

Action(s) to take:

Verify PTP Configurations and Status:

Perform an interface or control-plane EPC to verify Clock is receiving and sending PTP packets:

If EPC is not reliable, use the data collected by PTP debugs to verify what PTP values are being sent and received:

Best Master Clock Algorithm (BMCA)

Symptom

Possible Cause

Synchronization Failure

Clock Ignoring or Rejecting PTP Messages from GMC

Logging ErrorsResync Attempts

Incompatible PTP versions between network devices and GMC. Inaccurate clock data in Announce packets. Clock instability caused by multiple Grand Master Clocks within the same domain.

Action(s) to take:

Rule out any transit clocks or boundary clocks that could be contributing to latency or inaccurate time keeping.

Rule out any hardware or software limitations on the platform that prevents precise time keeping.

Collect PTP Debugs and check for any errors.

Grand Master Clock Selection

Symptom

Possible Cause

Best Master Clock Algorithm (BMCA) does not select the most accurate GMC. BMCA not calculating network delay.Mismatched priority settings.

Action(s) to take:

Sync Message Exchange

Symptom

Possible Cause

Transparent Clock (TC) misconfiguration such as incorrect PTP profile or mode. Errors in delay calculation.Sync Message packet dropped in transit or on control-plane of OC.

Action(s) to take:

Delay Request and Response

Symptom

Possible Cause

Transparent Clocks not capable of calculating precise time stamps that leads to inaccurate delay calculation. Delay Request or Response packets received in an incorrect order, lost in transit, or dropped before control-plane

Action(s) to take:

Correction and Synchronization

Symptom

Possible Cause

Inaccurate time corrections and delay compensations calculated by clocks. Hardware or software limitations that lead to incorrect system clock adjustment that causes synchronization failure.

Action(s) to Take

PTP Command Line Interface Show Commands

Verify the PTP Mode, Profile, Identity, Domain, PTP-enabled Interfaces, and PTP Interfaces states:

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#

An interface without PTP configurations remains in Domain 0 and in the INITIALIZING state.

Cat9300#show ptp brief

Interface                       Domain    PTP State

GigabitEthernet1/0/1            0         INITIALIZING

This is the transitional phases of clock in End-to-End Transparent Mode.

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

Check Platform Resources

Check Interfaces

A non-zero value for input drops, output drops, or CRC errors in the path of the PTP packets causes  failures.

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

Check Control-plane Policing

PTP packets are processed through the Low Latency Queue. PTP traffic shares the policy index with other network traffic types so it is best to verify there are no incrementing drops on the control-plane.

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

<>

Check CPU and Memory

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

Check 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

Platform Tools

Perform an Embedded Packet Capture (EPC)

Configuring an EPC

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

Note: Check the Network Management Configuration Guide for a given platform/version for more configuration options for EPC.

Verify Rx PTP Packets at Interface Level

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

Verify Rx Packets arrive at Control-Plane

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#

Verify Tx PTP Packets at Control-Plane Level

This would indicate the Cisco IOS® XE software and CPU is generating Rx  PTP Packets.

Note: An ingress EPC on a next hop switch or SPAN/RSPAN is more reliable to validate a local ordinary clock is sending out PTP packets.

Note: CPU-Generated packets such as ' ' are not be seen on egress with an EPC configured on a physical interface, a documented limitation of the EPC tool.

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

Cat9300#monitor capture cpu start

Collect PTP Debugs

Debug

Purpose

autocalibration

bmc

Displays what the interface is selected for.

messages

autocalibration 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

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 <<<

messages 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

21:59:13.273: %LINEPROTO-5-UPDOWN: Line protocol on Interface TwentyFiveGigE1/0/1, changed state to up <<<

21:59:13.846:  received message on TwentyFiveGigE1/0/1 <<<

21:59:13.846: PTP message received, intf: TwentyFiveGigE1/0/1, type: ANNOUNCE

21:59:14.846:  received message on TwentyFiveGigE1/0/1

21:59:14.846: PTP message received, intf: TwentyFiveGigE1/0/1, type: ANNOUNCE

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 <<<

Perform a Show Platform Forward (SPF)

Run this tool if PTP packets are seen arriving at interface but not punted to the control plane.

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#

Perform a Packet Tracer (PT)

PTP Caveats on Catalyst 9000

Cisco bug ID

Title Cisco bug ID

Cisco bug ID CSCvg24999

Switch crashes on ptp mode p2ptransparent.

Cisco bug ID CSCwf81913

PTP stops working on Catalyst switches, ports going into status uncalibrated.

Cisco bug ID CSCwa49052

PTP Offset & Mean Path delay can stuck on the bad switches and can never increment.Cisco bug ID

Cisco bug ID CSCvu73652

C9300 - PTP event messages with source port unequal 319 dropped.  Cisco bug ID

Cisco bug ID CSCwc35946

Inconsistent CLI Options When Changing Between 8275.1, 802.1AS, and Default PTP Profile.

Cisco bug ID CSCwc00050

Unable to Change PTP Mode via Web UI

Related Information

- Cisco Technical Support & Downloads