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Example: Configuring an Ordinary Slave Clock With Unicast-Negotiation

Requirements

• One ACX Series router
• Junos OS Release 12.2 or later

Overview

In this configuration, the ordinary slave clock uses unicast-negotiation and compensates for some network asymmetry.

Note: The values in this example are for illustration purposes only. You can set the values for each parameter according to your requirements.

Configuration

To configure an ordinary slave clock with unicast-negotiation, perform these tasks:

• Configuring an ordinary slave clock with unicast-negotiation
• Results

CLI Quick Configuration

set ptp clock-mode ordinary
set ptp domain 110
set ptp unicast-negotiation
set ptp slave delay-request -6
set ptp slave announce-timeout 2
set ptp slave announce-interval 3
set ptp slave sync-interval -5
set ptp slave grant-duration 7200
set ptp slave interface ge-0/1/0.0 unicast-mode transport ipv4
set ptp slave interface ge-0/1/0.0 unicast-mode clock-source 10.10.10.50 local-ip-address 10.10.10.75 asymmetry -4500

Configuring an ordinary slave clock with unicast-negotiation

Step-by-Step Procedure

1. Configure the clock mode, domain, and unicast-negotiation:
   [edit protocols ptp]user@host# set clock-mode ordinary domain 110 unicast-negotiation
2. Configure the announce timeout and the announce interval:
   [edit protocols ptp]user@host# set slave announce-timeout 2 announce-interval 3
3. Configure the synchronization interval and the grant duration:
   [edit protocols ptp]user@host# set slave sync-interval -5 grant-duration 7200
4. Configure the slave interface:
   [edit protocols ptp]user@host# edit slave interface ge-0/1/0.0
5. Configure the unicast transport mode:
   [edit protocols ptp slave interface ge-0/1/0.0]user@host# set unicast-mode transport ipv4
6. Configure the clock source:
   [edit protocols ptp slave interface ge-0/1/0.0]user@host# edit unicast-mode clock-source 10.10.10.50 local-ip-address 10.10.10.75
7. Configure the asymmetric path:
   [edit protocols ptp slave interface ge-0/1/0.0 unicast-mode clock-source 10.10.10.50 local-ip-address 10.10.10.75]user@host# set asymmetry -4500
8. Verify the configuration:
   [edit protocols ptp slave interface ge-0/1/0.0 unicast-mode clock-source 10.10.10.50 local-ip-address 10.10.10.75]user@host# top [edit]user@host# edit protocols [edit protocols]user@host# show

   See the output for the show command in the Results section.

Results

The following output shows the configuration of unicast-negotiation and compensation for some network asymmetry. The unicast-negotiation statement includes the parameters for the delay request, announce interval, synchronization interval, and grant duration values. Interface ge-0/1/0.0 is configured to compensate for an asymmetric path to the PTP master by subtracting 4.5 microseconds from the slave-to-master direction delay calculations.

[edit protocols]
user@host# show 
ptp {
    clock-mode ordinary;
    domain 110;
    unicast-negotiation;
    slave {
        delay-request -6;
        announce-timeout 2;
        announce-interval 3;
        sync-interval -5;
        grant-duration 7200;
        interface ge-0/1/0.0 {
            unicast-mode {
                transport ipv4;
                clock-source 10.10.10.50 local-ip-address 10.10.10.75 {
                    asymmetry -4500;
                }
            }
        }
    }
}