Asset ID:	1-79-2016591.1
Update Date:	2017-06-01
Keywords:

Solution Type Predictive Self-Healing Sure

Solution 2016591.1 : Recommended Changes for NTP Configuration According to Release 5.0 Standard Solution

Applies to:

Oracle Communications Diameter Signaling Router (DSR) - Version DSR 5.0 and later
Information in this document applies to any platform.

Purpose

The NTP topology configuration on the DSR network has changed in R5.0. The following are the supported solution highlights post R5.0 upgrade.

Details

Recommended Changes for NTP Configuration According to R5.0 Standard Solution

1. Recommendations

The NTP topology configuration on the DSR network has changed in R5.0. The following are the supported solution highlights post R5.0 upgrade.

Virtual guests should not be used as NTP servers. Avoid specifying virtual guests as NTP references for other servers. Guest emulated clocks have been shown to result in poor NTP server behavior

Virtual guests should synchronize to their virtual hosts. When virtualization is used in the product deployment, virtual guests should use their virtual hosts as their NTP references.
Follow a topology based approach.
MP servers should use their topology parents, or if those parents are virtual guests, the enclosing virtual hosts should be used instead.
SOAM servers should use their topology parents (NOAMs), or if those parents are virtual guests, the enclosing virtual hosts should be used instead. Ignore this recommendation if system is 2-tier as there are no SOAMs.
NOAMP and other A-Level servers should use a pool of 3 or more reliable, customer provided references if the NOAMPs are implemented in hardware, otherwise they should sync to their virtual hosts.
Virtual hosts should always have NTP enabled and configured. Virtual hosts that contain A-Level guests, PMACs or other virtual product servers should synchronize to a reliable pool of 3 or more customer references. Virtual hosts that contain B or C level guests should synchronize to the virtual hosts containing the parent topology guests.
Provide a robust pool of sources. The pool of customer NTP server references should be of stratum 3 or above, accurate and highly reliable. If possible both local site server and backup remote site servers should be provided.
Prefer local references. When references from multiple sites or networks are used on one server, the “prefer” keyword should be applied to the local references.
Ensure connectivity. Care should be taken to ensure that all NTP references are reachable through the appropriate networking configuration. In particular firewall rules must be correctly specified to allow NTP clients to connect to their specified references.

See Reference Diagram Attached for 2-Tier Environment

REFERENCE DIAGRAM ---2-TEIR ENVIRONMENT

See Reference Diagram Attached for 3-Tier Environment

REFERENCE DIAGRAM ---3-TEIR ENVIRONMENT

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