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Example: Configuring Precision Time Protocol

 

Requirements for PTP Configuration

This example uses the following hardware and software components:

  • One MX80, MX240, MX480, or MX960 router

  • Junos OS Release 12.2 or later

Overview

This example shows the configuration of Precision Time Protocol (PTP) on all Ethernet Modular Interface Cards (MICs) on the enhanced Module Port Concentrator (MPCE) MX-MPC2E-3D-P on MX240, MX480, and MX960 routers and on the MX80 Universal Routing Platforms with precision timing support (MX80-P).

PTP synchronizes clocks between nodes in a network, thereby enabling the distribution of an accurate clock over a packet switched network. This synchronization is achieved through packets that are transmitted and received in a session between the master clock and the client clock. PTP also supports boundary clock.

Note

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

Configuration

CLI Quick Configuration

To quickly configure PTP on an interface, copy the following commands, paste them in a text file, remove any line breaks, and then copy and paste the commands into the CLI.

[edit]

set interfaces ge-0/1/0 unit 0 family inet address 192.0.2.5/24

set interfaces ge-0/1/5 unit 0 family inet address 198.51.100.5/24

set protocols ptp clock-mode boundary priority1 1 priority2 2 domain 0 unicast-negotiation

set protocols ptp slave interface ge-0/1/0.0 unicast-mode transport ipv4

set protocols ptp slave announce-timeout 2 delay-request –4 frequency-only

set protocols ptp slave interface ge-0/1/0.0 unicast-mode clock-source 192.0.2.3 local-ip-address 192.0.2.5

set protocols ptp master interface ge-0/1/5.0 unicast-mode transport ipv4

set protocols ptp master announce-interval 0 clock-step one-step sync-interval 0

set protocols ptp master interface ge-0/1/5.0 unicast-mode clock-client 198.51.100.3 local-ip-address 198.51.100.5

The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode in the CLI User Guide.

For step-by-step configuration, see Configuring Precision Time Protocol.

To configure PTP, perform the following tasks:

  1. Configure two interfaces and assign IP addresses to it.
  2. Configure the clock mode, priorities, domain, and unicast negotiation options for PTP.
  3. Configure the client interface
  4. Configure the announce timeout, delay request, and frequency synchronization parameters for the client.
  5. Assign the IP address of the remote master using the clock-source option and the IP address of the local interface acting as the client.
  6. Configure the master interface
  7. Configure the announce interval, clock step, and synchronous interval parameters for the master.
  8. Configure the remote PTP host that will receive time from the PTP master using the clock-client option and the IP address of the local interface acting as master.

Results

Display the results of the configuration:

Verification

Confirm that the configuration is working properly.

Verifying the PTP Clock Details

Purpose

Verify that the PTP clock is working as expected.

Action

In operational mode, enter the run show ptp clock command to display the clock details.

Meaning

The output displays the clock details, which include the parameters configured on the node. For more information about the run show ptp clock operational command, see show ptp clock.

Verifying the Lock Status of the Slave

Purpose

Verify that the client clock is aligned to the master clock by checking the lock status of the client.

Action

In operational mode, enter the run show ptp lock-status command to display the lock status of the client.

Meaning

The output displays information about the lock status of the client. The output shows whether the client is aligned to the master clock or not. For more information about the run show ptp lock-status operational command, see show ptp lock-status.

Verifying the PTP Options on the Slave

Purpose

Verify the PTP options that are set on the client and its current status.

Action

In operational mode, enter the run show ptp slave command to display the configured client.

Meaning

The output displays information about the configured client and the status of the client. For more information about the run show ptp slave operational command, see show ptp slave.

Verifying the PTP Options and the Current Status of the Master

Purpose

Verify the PTP options that are set for the ` and its current status.

Action

In operational mode, enter the run show ptp master command to display the configured options for the master.

Meaning

The output displays information about the configured master and the current status of the master. For more information about the run show ptp master operational command, see show ptp master.

Verifying the Number and Status of the PTP Ports

Purpose

Verify the number of PTP ports and their current status.

Action

In operational mode, enter the run show ptp port command to display the configured ports.

Meaning

The output displays information about the number of ports created according to the configuration and their current status. For each unique local IP address, one PTP port is created. For more information about the run show ptp port operational command, see show ptp port.

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