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External Clock Synchronization Overview for ACX Series Routers on page 226•

• synchronization on page 1739

• Interface and Router Clock Sources Overview

IEEE 1588v2 PTP Boundary Clock Overview

The IEEE 1588v2 standard defines the Precision Time Protocol (PTP), which is used to

synchronize clocks throughout a network. The standard describes the PTP boundary

clock’s hierarchical master/slave architecture for the distribution of time-of-day.

•

IEEE 1588v2 PTP Boundary Clock on page 234

•

Clock Clients on page 236

IEEE 1588v2 PTP Boundary Clock

Starting with Junos OS Release 17.3R1, IEEE 1588v2 boundary clock is supported on

QFX10002 switches. An IEEE 1588v2 boundary clock has multiple network connections

and can act as a source (master) and a destination (slave or client) for synchronization

messages. It synchronizes itself to a best master clock through a slave port and supports

synchronization of remote clock clients to it on master ports. Boundary clocks can improve

the accuracy of clock synchronization by reducing the number of 1588v2-unaware hops

between the master and the client. Boundary clocks can also be deployed to deliver

better scale because they reduce the number of sessions and the number of packets per

second on the master.

The boundary clock intercepts and processes all PTP messages and passes all other

traffic. The best master clock algorithm (BMCA) is used by the boundary clock to select

the best configured acceptable master clock that a boundary slave port can see. To

configure a boundary clock, include the boundary statement at the [edit protocols ptp

clock-mode] hierarchy level and at least one master with the master statement and at

least one slave with the slave statement at the [edit protocols ptp] hierarchy level.

Figure 21 on page 235 illustrates two boundary clocks in a network in which the clock flow

is from the upstream node (BC-1) to the downstream node (BC-2).

NOTE: This figure also applies to MX Series routers and QFX Series switches.

ACX Series Universal Access Router Configuration Guide

Juniper ACX2000 Configuration Guide

Other manuals for Juniper ACX2000