Server Time Protocol Implementation Guide

An IBM Redbooks publication

Published 28 June 2013, updated 01 November 2016

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ISBN-10: 0738438111
ISBN-13: 9780738438115
IBM Form #: SG24-7281-03
(456 pages)

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Authors: Octavian Lascu, Hans-Peter Eckam, George Kozakos, Paulo Vitor Pereira


Server Time Protocol (STP) is a server-wide facility that is implemented in the Licensed Internal Code (LIC) of IBM® zEnterprise EC12 (zEC12), IBM zEnterprise 196 (z196), IBM zEnterprise 114 (z114), IBM System z10®, and IBM System z9®. It provides improved time synchronization in both a sysplex or non-sysplex configuration.

This IBM Redbooks® publication will help you configure a Mixed Coordinated Timing Network (CTN) or an STP-only CTN. It is intended for technical support personnel requiring information about:

-Installing and configuring a Coordinated Timing Network
-Using STP functions and operations
-Migrating to a Coordinated Timing Network from various timing environments

Readers are expected to be familiar with IBM System z technology and terminology. For planning information, see our companion book, Server Time Protocol Planning Guide, SG24-7280. For information about how to recover your STP environment functionality, see the Server Time Protocol Recovery Guide, SG24-7380.

Table of contents

Part 1. Setting up the Coordinated Timing Network
Chapter 1. Configuring an External Time Source
Chapter 2. Migrating from ETR to STP-only CTN
Chapter 3. Configuring an STP-only CTN
Chapter 4. STP-only CTN: Adding a server in STP timing mode
Part 2. CTN operations
Chapter 5. Operations in an ETR and Mixed CTN
Chapter 6. Operations in an STP-only CTN
Chapter 7. Operational considerations
Part 3. Migration scenarios
Chapter 8. ETR Network to Mixed CTN (ETR timing mode)
Chapter 9. Mixed CTN (ETR timing mode) to ETR Network
Chapter 10. Mixed CTN: Changing one server from the ETR timing mode to the STP timing mode
Chapter 11. Mixed CTN: Changing one server from STP timing mode to ETR timing mode
Chapter 12. Mixed CTN: Adding a server in STP timing mode
Chapter 13. Mixed CTN (two servers) to STP-only CTN
Chapter 14. Mixed CTN (three servers) to STP-only CTN
Chapter 15. STP-only to Mixed CTN
Appendix A. POR of a server in an STP-only CTN
Appendix B. How to draw a CTN topology

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