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Cisco Bug: CSCvt46375 - Nexus 9405 // Huge PTP corrections even connected to GM // NX)S 9.3(3)

Last Modified

Apr 18, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

9.3(3)

Description (partial)

Symptom:
PTP past corrections
-----------------------------------------------------------------------------------
Slave Port              SUP Time               Correction(ns)    MeanPath Delay(ns)
----------  -------------------------------  ------------------  ------------------
Eth1/24     Thu Feb 27 07:43:22 2020 635961            -4375223                   0
Eth1/24     Thu Feb 27 07:42:56 2020 883846            13308538                   0
Eth1/24     Thu Feb 27 07:42:35 2020 382332           -13373611                   0

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)
----------  -------------------------------  ------------------  ------------------  ------------------  ---------  ------------------  ---------  -------  ------------------
Eth1/24     Thu Feb 27 07:43:22 2020 636012            -4375223                   0          1582789439  635930441          1582789439  640305664    26723        147450182568
Eth1/24     Thu Feb 27 07:42:56 2020 883902            13308538                   0          1582789413  883810426          1582789413  870501888    26620        147454557791
Eth1/24     Thu Feb 27 07:42:35 2020 382389           -13373611                   0          1582789392  382291796          1582789392  395665407    26534        147441249253

Conditions:
Even when connected to the GM we do see huge corrections. I have observe lately some other cases with same situation and same version.

A customer from diff case did not observe a similar behavior on trail 9.2.x
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