Thanks Richard. So, PARENT_DATA_SET has all the information about grand master?
Regards, Jawad ________________________________ From: Richard Cochran <richardcoch...@gmail.com> Sent: Wednesday, January 15, 2020 11:25 PM To: jawad ahmed saleemi <jawad.sale...@hotmail.com> Cc: linuxptp-users@lists.sourceforge.net <linuxptp-users@lists.sourceforge.net> Subject: Re: [Linuxptp-users] PMC GET commands On Wed, Jan 15, 2020 at 03:06:24PM +0000, jawad ahmed saleemi wrote: > Is there a documentation which explains what all these different PMC GET > commands return? With the exception of the custom NP TLVs, these are standard management messages documented in IEEE 1588. > For example, what does the data returned in GET PARENT_DATA_SET > mean? There is gm.ClockClass field in returned data which is not the > same as clockClass field returned in GET > GRANDMASTER_SETTINGS_NP. Can you please explain what is the > difference? The GRANDMASTER_SETTINGS_NP are the values used if the local clock becomes the GM. Below are my notes about the various TLVs. HTH, Richard * CURRENT_DATA_SET stepsRemoved 0 offsetFromMaster 0.0 meanPathDelay 0.0 * PARENT_DATA_SET # find out the GM identity parentPortIdentity e89a8f.fffe.74f796-0 parentStats 0 observedParentOffsetScaledLogVariance 0xffff observedParentClockPhaseChangeRate 0x7fffffff grandmasterPriority1 128 gm.ClockClass 248 gm.ClockAccuracy 0xfe gm.OffsetScaledLogVariance 0xffff grandmasterPriority2 128 grandmasterIdentity e89a8f.fffe.74f796 * TIME_PROPERTIES_DATA_SET # find out whether time is globally traceable currentUtcOffset 35 leap61 0 leap59 0 currentUtcOffsetValid 0 ptpTimescale 0 timeTraceable 0 frequencyTraceable 0 timeSource 0xa0 * PORT_DATA_SET # knowing the portState can be useful, SLAVE and MASTER portIdentity e89a8f.fffe.74f796-1 portState FAULTY logMinDelayReqInterval 0 peerMeanPathDelay 0 logAnnounceInterval 1 announceReceiptTimeout 3 logSyncInterval 0 delayMechanism 1 logMinPdelayReqInterval 0 versionNumber 2 * GRANDMASTER_SETTINGS_NP # values used when nodes becomes the GM # SET action useful for GPS time server clockClass 248 clockAccuracy 0xfe offsetScaledLogVariance 0xffff currentUtcOffset 35 leap61 0 leap59 0 currentUtcOffsetValid 0 ptpTimescale 0 timeTraceable 0 frequencyTraceable 0 timeSource 0xa0 * DEFAULT_DATA_SET # discover the numberPorts twoStepFlag 1 slaveOnly 0 numberPorts 1 priority1 128 clockClass 248 clockAccuracy 0xfe offsetScaledLogVariance 0xffff priority2 128 clockIdentity e89a8f.fffe.74f796 domainNumber 0 * AVB... * TIME_STATUS_NP # designed for use with gPTP and free_running master_offset 0 ingress_time 0 cumulativeScaledRateOffset +0.000000000 scaledLastGmPhaseChange 0 gmTimeBaseIndicator 0 lastGmPhaseChange 0x0000'0000000000000000.0000 gmPresent false gmIdentity e89a8f.fffe.74f796 * PORT_DATA_SET_NP # gPTP: SET neighborPropDelayThresh and GET asCapable neighborPropDelayThresh 20000000 asCapable 0
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