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Example: Configuring Hybrid Mode and ESMC Quality Level Mapping

Requirements for Hybrid Mode Configuration

• 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 3D Universal Edge Routers and on MX80 3D Universal Edge Routers 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 slave and the Synchronous Ethernet source are on the same enhanced MPC and are traceable to the same master. When acting as a PTP slave, 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 slave. On the slave, 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.

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

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

1. Configure the convert-clock-class-to-quality-level option on the slave at the [edit protocols ptp slave] hierarchy level.
   [edit protocols ptp slave]user@host# set convert-clock-class-to-quality-level
2. Configure hybrid mode on the slave.
   [edit protocols ptp slave]user@host# edit hybrid
3. Configure the Synchronous Ethernet mapping option, IP address of the master clock as 2.2.2.2, and the interface ge-1/2/3.0 for hybrid mode on the slave.
   [edit protocols ptp slave hybrid]user@host# set synchronous-ethernet-mapping clock-source 2.2.2.2 interface ge-1/2/3.0

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

1. Configure the quality-level option for the clock-class-to-quality-level-mapping statement on the slave 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.
   [edit protocols ptp slave]user@host# set clock-class-to-quality-level-mapping quality-level prc clock-class 80
2. Configure hybrid mode on the slave.
   [edit protocols ptp slave]user@host# edit hybrid
3. Configure the Synchronous Ethernet mapping option, IP address of the master clock as 2.2.2.2 , and the interface ge-1/2/3.0 for hybrid mode on the slave.
   [edit protocols ptp slave hybrid]user@host# set synchronous-ethernet-mapping clock-source 2.2.2.2 interface ge-1/2/3.0

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

Verifying That the Router Is Operating in Hybrid Mode

Purpose

Verify the current mode of operation of the slave.

Action

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

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 slave. 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:

PTP Global Configuration:
Domain number           : 0
Transport Encapsulation : IPv4
Clock mode              : Ordinary
Priority Level1         : 128
Priority Level2         : 128
Unicast Negotiation     : Disabled
ESMC QL From Clock Class: Enabled
Clock Class/ESMC QL     : 84 / (QL SSU-A/SSM 0x4)
Slave Parameters:
  Sync Interval         : -
  Delay Request Interval: -6 (64 packets per second) 
  Announce Interval     : -
  Announce Timeout      : 3 
Master Parameters: 
  Sync Interval         : -6 (64 packets per second) 
  Delay Request Interval: - 
  Announce Interval     : 1 (1 packet every 2 seconds) 
  Clock Step            : one-step 
Number of Slaves       : 1 
Number of Masters      : 0 

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

quality level         ptp clock class
PRC                      84
SSU-A                    92
SSU-B                    96
SEC                      104

Meaning

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

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:

PTP Global Configuration:
Domain number           : 0
Transport Encapsulation : IPv4
Clock mode              : Ordinary
Priority Level1         : 128
Priority Level2         : 128
Unicast Negotiation     : Disabled
ESMC QL From Clock Class: Disabled
Clock Class/ESMC QL     :  -
Slave Parameters:
  Sync Interval         : -
  Delay Request Interval: -6 (64 packets per second)
  Announce Interval     : - 
  Announce Timeout      : 3 
Master Parameters:   
  Sync Interval         : -6 (64 packets per second) 
  Delay Request Interval: -
  Announce Interval     : 1 (1 packet every 2 seconds) 
  Clock Step            : one-step 

Meaning

The output displays the parameters set in Synchronous Ethernet mode and the parameters set for the master and the slave.