Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

Example: Configuring Hybrid Mode and ESMC Quality Level Mapping

This example shows the configuration of hybrid mode by mapping the PTP clock class to the ESMC quality level and also by configuring a user-defined mapping of the PTP clock class to the ESMC quality level on MX240 Universal Routing Platforms.

Requirements for Hybrid Mode Configuration

This example uses the following hardware and software components:

  • One MX240 router.

  • Junos OS Release 12.2R2 or later.

Overview

The combined operation of Synchronous Ethernet and Precision Time Protocol (PTP) is also known as hybrid mode. In hybrid mode, the synchronous Ethernet equipment clock (EEC) on the Modular Port Concentrator (MPC) derives the frequency from Synchronous Ethernet and the phase and time of day from PTP.

You can configure hybrid mode on MX240, MX480, and MX960 Universal Routing Platforms and on MX80 Universal Routing Platforms with precision timing support (MX80-P) and with timing support (MX80-T). On the MX240, MX480, and MX960 routers, the combined operation is possible only when the PTP client and the Synchronous Ethernet source are on the same enhanced MPC and are traceable to the same primary. When acting as a PTP client, an MX80-P or MX80-T router can accept any external Synchronous Ethernet clock as reference. Note that when the selected Synchronous Ethernet reference fails, the router continues to work in PTP mode.

Hybrid mode is configured on the client. On the client, one or more interfaces are configured as Synchronous Ethernet source interfaces.

Note:

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

The ESMC quality level value is mapped to the clock class value either by mapping the PTP clock class to the ESMC quality level or by configuring a user-defined mapping of the PTP clock class to the ESMC quality level. For more information, see Understanding ESMC Quality Level Mapping. The following examples explain configuring hybrid mode with either of the modes in detail.

To configure the router in hybrid mode, you must:

  1. Configure Synchronous Ethernet options at the [edit chassis synchronization] hierarchy level:

    • Configure the auto-select mode of operation. You can select the clock source either from a free-run local oscillator or from an external qualified clock.

      When the router is configured with the auto-select option, the router chooses up to two best upstream clock sources. It then uses the clock recovered from one of the sources to lock the chassis clock. If an upstream clock with acceptable quality is not available or if the router is configured in free-run mode, the router uses the internal oscillator.

    • Configure the esmc-transmit and network-option options at the [edit chassis synchronization] hierarchy level.

    • Configure one or more interfaces at the [edit chassis synchronization] hierarchy level as Synchronous Ethernet sources as needed.

  2. Configure PTP options at the [edit protocols ptp] hierarchy level.

  3. Configure hybrid mode options at the [edit protocols ptp slave] hierarchy level.

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. For step-by-step configuration of hybrid mode, see Configuring Hybrid Mode and ESMC Quality Level Mapping.

Configuration

Hybrid Mode with Mapping of the PTP Clock Class to the ESMC Quality Level

CLI Quick Configuration

To quickly configure hybrid mode on the ge-1/2/3.0 interface with the clock source IP address as 2.2.2.2, 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 protocols ptp slave hybrid

set protocols ptp slave hybrid synchronous-ethernet-mapping

set protocols ptp slave hybrid synchronous-ethernet-mapping clock-source 2.2.2.2 interface ge-1/2/3.0

set protocols ptp slave convert-clock-class-to-quality-level

Step-by-Step Procedure

To configure hybrid mode on an MX240 router with mapping of the PTP clock class to the ESMC quality level, perform the following steps:

  1. Configure the convert-clock-class-to-quality-level option on the client at the [edit protocols ptp slave] hierarchy level.

  2. Configure hybrid mode on the client.

  3. Configure the Synchronous Ethernet mapping option, IP address of the primary clock as 2.2.2.2, and the interface ge-1/2/3.0 for hybrid mode on the client.

Results

Display the results of the configuration of hybrid mode with the mapping of the PTP clock class to the ESMC quality level:

Hybrid Mode with a User-Defined Mapping of the PTP Clock Class to the ESMC Quality Level

CLI Quick Configuration

To quickly configure hybrid mode on the interface ge-1/2/3.0, 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 protocols ptp slave hybrid

set protocols ptp slave hybrid synchronous-ethernet-mapping

set protocols ptp slave hybrid synchronous-ethernet-mapping clock-source 2.2.2.2 interface ge-1/2/3.0

set protocols ptp slave clock-class-to-quality-level-mapping quality-level prc clock-class 80

Step-by-Step Procedure

To configure hybrid mode with a user-defined mapping of the PTP clock class to the ESMC quality level on an MX240 router, perform the following steps:

  1. Configure the quality-level option for the clock-class-to-quality-level-mapping statement on the client at the [edit protocols ptp slave] hierarchy level and then configure the clock-class option for the set quality level if you want to manually override the mapping of the ESMC quality level to the clock class.

  2. Configure hybrid mode on the client.

  3. Configure the Synchronous Ethernet mapping option, IP address of the primary clock as 2.2.2.2 , and the interface ge-1/2/3.0 for hybrid mode on the client.

Results

Display the results of the configuration of hybrid mode with a user-defined mapping of the PTP clock class to the ESMC quality level:

Verification

Verifying That the Router Is Operating in Hybrid Mode

Purpose

Verify the current mode of operation of the client.

Action

In operational mode, enter the run show ptp hybrid command to display the current configuration and current mode of operation of the client.

In operational mode, enter the run show ptp hybrid config command to display the PTP source to Synchronous Ethernet interface mappings.

In operational mode, enter the run show ptp hybrid status command to display the current hybrid mode operational status.

Meaning

The output displays the current configuration and current mode of operation of the client. For information about the run show ptp hybrid operational command, see show ptp hybrid.

Verifying the Quality Level Change on the Transmit Side

Purpose

Verify the quality level change on the transmit side of the router.

Action

In operational mode, enter the run show synchronous-ethernet esmc transmit detail command to display the ESMC transmit interface details.

Meaning

The output displays the ESMC SSM quality level transmitted out of various Ethernet interfaces. For information about the run show synchronous-ethernet esmc transmit detail operational command, see show synchronous-ethernet esmc transmit.

Verifying Global Information Parameters After Mapping of the PTP Clock Class to the ESMC Quality Level in Hybrid Mode

Purpose

Verify the global information parameters after mapping of the PTP clock class to the ESMC quality level in hybrid mode by enabling the convert-clock-class-to-quality-level option.

Action

In operational mode, enter the run show ptp global-information command to display the following output:

In operational mode, enter the run show ptp quality-level-mapping command to display the following output:

Meaning

The output for run show ptp global-information displays the parameters set in Synchronous Ethernet mode and the parameters set for the primary and the client.

The output of run show ptp quality-level-mapping displays the default mapping of the clock class to the ESMC quality level.

Verifying Global Information Parameters After Configuring User-Defined Mapping of the PTP Clock Class to the ESMC Quality Level in Hybrid Mode

Purpose

Verify the global information parameters after configuring a user-defined mapping of the PTP clock class to the ESMC quality level in hybrid mode by disabling the convert-clock-class-to-quality-level option.

Action

In operational mode, enter the run show ptp global-information command to display the following output:

Meaning

The output displays the parameters set in Synchronous Ethernet mode and the parameters set for the primary and the client.