Keeping Time with Precision Time Protocol (PTP) · Ensuring PTP Lock •Grandmaster ID •Domain...
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CURATED BY IP SHOWCASE THEATER AT NAB – APRIL 8-11, 2019 Keeping Time with Precision Time Protocol (PTP) Michael Waidson, Application Engineer Tektronix, Inc.
Transcript of Keeping Time with Precision Time Protocol (PTP) · Ensuring PTP Lock •Grandmaster ID •Domain...
C U R A T E D B Y
IP SHOWCASE THEATER AT NAB – APRIL 8-11, 2019
Keeping Time with Precision Time Protocol (PTP)
Michael Waidson, Application Engineer
Tektronix, Inc.
What time is it?
•What time is it now! • Precision Time Protocol – IEEE 1588 -2008
‒ Sends a Sync message periodic
‒ How many seconds
‒ How many nanoseconds
‒ From the SMPTE Epoch
‒ January 1st midnight, 1970
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BMCA Best Master Clock Algorithm
• How to elect a Grandmaster Clock?
• Priority 1 (0-255) lowest number wins set by user
• Clock Class, Clock Accuracy, Clock Variance set by device
• Priority 2 (0-255) set by user
• MAC address of device
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Hybrid Master Clock & SPG
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SPG Master Clock SPG Master Clock
Priority 1 - 128 Clock Class 6 Priority 2 - 64
Priority 1 - 128 Clock Class 6
Priority 2 - 96
Network Cloud
GM
Hybrid Master Clock & SPG
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SPG Master Clock SPG Master Clock
Priority 1 - 128 Clock Class 7 Priority 2 - 64
Priority 1 - 128 Clock Class 6
Priority 2 - 96
Network Cloud
GM
Hybrid Master Clock & SPG
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SPG Master Clock SPG Master Clock
Priority 1 - 128 Clock Class 6 Priority 2 - 64
Priority 1 - 64 Clock Class 6
Priority 2 - 96
Network Cloud
GM
Message Types
• Announce
• Sync
• Follow-Up
• Delay Request
• Delay Response
• Management
• Signaling
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224.0.1.129 192.168.1.10 192.168.1.20
Announce Message (320)
Delay_Request (319)
Sync Message (319)
Delay_Response Message (320)
Management Message (320)
Follow_Up Message (320)
Troubleshooting PTP
• Check Domain Value
• Check Grandmaster ID
• Check Message Rates
• Check Communication Mode
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Ensuring PTP Lock
• Grandmaster ID
• Domain
• Master/Slave Phase Lag should have low value for lock
• Messages Rates ‒ SMPTE 2059
‒ 4 Announce messages per second
‒ 8 Sync, Delay Request, Delay Response
• Steps removed from Master
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IP Status – Checking Domain
• Check Following
‒Domain Values
‒Data Rates of PTP messages
‒Check source IP & MAC
BMCA Keeps Toggling ID
• Check Configuration of Boundary Clock
• Check for loop of messages
• Check Messages Rates
• Check Announce Timeout
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2017 – 12 -06 23:44:00 (UTC)
08:00:11:ff:fe:21:90:2b
2017 – 12 -06 23:44:01 (UTC)
28:99:3a:ff:ff:d3:4f:72
2017 – 12 -06 23:44:02 (UTC)
08:00:11:ff:fe:21:90:2b
Monitoring PTP Graphs
• Check ‒ Phase Lag
‒ M-S Delay
‒ S-M Delay
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PTP Network Topology
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End Device
Backup
1G
1G
Transparent Switch
Boundary Switches
Primary
End Device
10G 10G 10G
10G 10G
1G
Grand Master Passive
End Device
Checking PTP at the Switch
• show ptp
• show ptp brief
• show ptp clock
• show ptp parent
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Checking PTP Messages at the Switch Port
• watch 1 diff show ptp interface ethernet xx
• sh ptp port interface ethernet 1/x counters
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Checking PTP Messages at the Switch Port
• sh ptp port interface ethernet 1/x counters
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What time is it?
•What time is it now! • Precision Time Protocol – IEEE 1588 -2008
• SMPTE 2059-1 & 2059-2
• Provides Timing Reference across a Media Network
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C U R A T E D B Y
IP SHOWCASE THEATER AT NAB – APRIL 8-11, 2019
Thank You
Michael Waidson, Tektronix, Inc.
