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Table of Contents Expand all

play_arrow Overview
play_arrow Precision Time Protocol
- play_arrow Precision Time Protocol Overview
- play_arrow Precision Time Protocol Clocks
- play_arrow Precision Time Protocol Profiles
- play_arrow PHY Timestamping
- play_arrow Precision Time Protocol over Ethernet
- play_arrow Precision Time Protocol Additional Features
play_arrow Global Navigation Satellite System (GNSS)
- play_arrow GPS Systems on Routing Platforms
  - Global Positioning System (GPS) on Routing Platforms
- play_arrow Integrated GNSS on Routing Platforms
  - Integrated Global Navigation Satellite System (GNSS) on Routing Platforms
- play_arrow GNSS Configuration for Routers Using External GNSS Receiver
- play_arrow Assisted Partial Timing Support (APTS) on Routing Platforms
play_arrow Network Time Protocol
- play_arrow NTP Concepts
- play_arrow NTP Configuration Examples
play_arrow Synchronous Ethernet
- play_arrow Synchronous Ethernet Overview
- play_arrow Synchronous Ethernet on 10-Gigabit Ethernet MIC
  - Synchronous Ethernet on 10-Gigabit Ethernet MIC
  - Example: Configure Framing Mode for Synchronous Ethernet with 10-Gigabit Ethernet MIC
play_arrow Clock Synchronization
- play_arrow Clock Synchronization Concepts
- play_arrow Clock Synchronization for ACX Series Routers
  - Configure External Clock Synchronization for ACX Series Routers
- play_arrow Clock Synchronization for MX Series Routers
  - Configure External Clock Synchronization for MX Series Routers
- play_arrow Clock Synchronization for PTX Series Routers
  - Clock Sources for PTX Series Routers
  - Synchronize Internal Stratum 3 Clock to External Clock Sources on PTX Series Routers
- play_arrow Centralized Clocking
play_arrow Hybrid Mode
- play_arrow Hybrid Mode Overview
  - Hybrid Mode
  - Guidelines to Configure Hybrid Mode on ACX Series Routers
- play_arrow Hybrid Mode and ESMC Quality-Level Mapping
play_arrow Configuration Statements and Operational Commands
- Junos CLI Reference Overview
play_arrow Appendix
- Appendix - Inclusive Terms

list Table of Contents

English

Configuring Clock Synchronization Options
Display the External Clock Synchronization Configuration for SCB
Display the External Clock Synchronization Configuration for SCBE
Display the External Clock Synchronization Configuration for SCBE2
Displaying the External Clock Synchronization Configuration for MX2020 Control Board

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Configure Clock Synchronization Interface on MX Series Routers

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MX Series routers support external clock synchronization for Synchronous Ethernet, T1 or E1 line timing sources, and external inputs. Configuring external clock synchronization requires making clock selection, quality level, and priority considerations. The clock source selection algorithm is used to pick the two best upstream clock sources from among the various sources on the basis of system configuration and execution criteria such as quality level, priority, and hardware restrictions. For information about the clock synchronization options, see Understanding Clock Synchronization.

The following sections explain configuring clock synchronization options for MX Series routers:

Note:

Starting with Junos OS Release 13.3, the following scenarios occur when you configure Synchronous Ethernet without the clock-class-to-quality-level-mapping statement at the [edit protocols ptp slave] hierarchy level:

Qualified clock source quality level (that is the secondary clock source quality level) is transmitted out of the external interface and the Ethernet interface during clock reference switchover when two clock sources on different MICs of the same FPC exist or when two clock sources on two different FPCs exist.
Lower quality level is transmitted out the external interface and the Ethernet interface during clock reference switchover when two clock sources on the same MIC of an FPC exist due to hardware limitation.

Before you remove the SCBE from the router, you must delete the configuration under the [edit chassis synchronization] hierarchy level. Similarly, before you remove the SCBE2 from the router, you must delete the configuration under the [edit chassis synchronization] hierarchy level.

On SCBE2, the external-0/0 interface is located on SCB0 and the external-1/0 interface is located on SCB1.

Configuring Clock Synchronization Options

To configure the clock synchronization options.

In configuration mode, go to the [edit chassis synchronization] hierarchy level.
```
[edit]
user@host# edit chassis synchronization
```
Configure the Synchronous Ethernet clock selection mode as auto-select or free-run.
```
[edit chassis synchronization]
user@host# set clock-mode (auto-select | free-run)
```
Configure the ESMC transmit parameters on all the interfaces or on selected interfaces.
```
[edit chassis synchronization]
user@host# set esmc-transmit interfaces (all | interface-name)
```
Configure the hold interval as configuration-change, which is the wait time (from 15 seconds through 60 seconds) after a change in configuration; restart, which is the wait time (from 60 seconds through 180 seconds) after reboot of the router; and switchover, which is the switchover wait time (from 30 seconds through 60 seconds) after clock recovery.
```
[edit chassis synchronization]
user@host# set hold-interval configuration-change secs
user@host# set hold-interval restart secs
user@host# set hold-interval switchover secs
```
Configure the options for the external interfaces on the basis of the type of Enhanced Switch Control Board on your MX Series router.
The SCBE has only one external interface. Configure the following options for SCBE:
1. Go to the [edit chassis synchronization interfaces external] hierarchy level.
  [edit chassis synchronization] user@host# edit interfaces external
2. Configure all the E1 interface-specific options—the framing statement as g704 or g704-no-crc, the line-encoding statement as ami or hdb3, and the sabit statement from 4 bits through 8 bits.
  [edit chassis synchronization interfaces external] user@host# set e1-options framing (g704 | g704-no-crc) user@host# set e1-options line-encoding (ami | hdb3) user@host# set e1-options sabit bit
3. Configure the pulse-per-second-enable statement to enable the pulse per second (PPS) signal to be received on the GPS interface.
  [edit chassis synchronization interfaces external] user@host# set pulse-per-second-enable
4. Configure the frequency for the provided reference clock as 1 MHz, 5 MHz, 10 MHz, 2048 kHz, e1, or t1.
  [edit chassis synchronization interfaces external] user@host# set signal-type (1hz | 5mhz | 10mhz | 2048khz | e1 | t1)
5. Configure the T1 interface-specific options—the framing statement as esf or sf and the line-encoding statement as ami or b8zs.
  [edit chassis synchronization interfaces external] user@host# set t1-options framing (esf | sf) user@host# set t1-options line-encoding (ami | b8zs)
The SCBE2 Control Board has two external interfaces—external-0/0 and external-1/0. Configure the following options for SCBE2 Control Board:
1. Go to the [edit chassis synchronization interfaces external-0/0] or [edit chassis synchronization interfaces external-1/0] hierarchy level.
  [edit chassis synchronization] user@host# edit interfaces external-0/0
  OR
  [edit chassis synchronization] user@host# edit interfaces external-1/0
2. Configure all the E1 interface-specific options—the framing statement as g704 or g704-no-crc, the line-encoding statement as ami or hdb3, and the sabit statement from 4 bits through 8 bits-—on the external-0/0 interface or the external-1/0 interface.
  [edit chassis synchronization interfaces (external-0/0 | external-1/0)] user@host# set e1-options framing (g704 | g704-no-crc) user@host# set e1-options line-encoding (ami | hdb3) user@host# set e1-options sabit bit
3. Configure the pulse-per-second-enable statement to enable the pulse per second (PPS) signal to be received on the GPS interface of the router.
  [edit chassis synchronization interfaces (external-0/0 | external-1/0)] user@host# set pulse-per-second-enable
4. Configure the frequency for the provided reference clock as 1 MHz, 5 MHz, 10 MHz, 2048 kHz, e1, or t1.
  [edit chassis synchronization interfaces (external-0/0 | external-1/0)] user@host# set signal-type (1hz | 5mhz | 10mhz | 2048khz | e1 | t1)
5. Configure the T1 interface-specific options—the framing statement as esf or sf and the line-encoding statement as ami or b8zs.
  [edit chassis synchronization interfaces (external-0/0 | external-1/0)] user@host# set t1-options framing (esf | sf) user@host# set t1-options line-encoding (ami | b8zs)
The MX2020 Control Board has two external interfaces—external-a and external-b. Configure the following options for MX2020 Control Board:
1. Go to the [edit chassis synchronization interfaces external-a] or [edit chassis synchronization interfaces external-b] hierarchy level.
  [edit chassis synchronization] user@host# edit interfaces external-a
  OR
  [edit chassis synchronization] user@host# edit interfaces external-b
2. For BITS interface, configure all the E1 interface-specific options—the framing statement as g704 or g704-no-crc, the line-encoding statement as ami or hdb3, and the sabit statement from 4 bits through 8 bits-—on the external-a interface or the external-b interface.
  [edit chassis synchronization interfaces (external-a | external-b)] user@host# set e1-options framing (g704 | g704-no-crc) user@host# set e1-options line-encoding (ami | hdb3) user@host# set e1-options sabit bit
3. Configure the pulse-per-second-enable statement to enable the pulse per second (PPS) signal to be received on the GPS interface of the router.
  [edit chassis synchronization interfaces (external-a | external-b)] user@host# set pulse-per-second-enable
4. Configure the frequency for the provided reference clock as 1 MHz, 5 MHz, or 10 MHz for GPS interface and 2048 kHz, e1, or t1 for BITS interface.
  [edit chassis synchronization interfaces (external-a | external-b)] user@host# set signal-type (1hz | 5mhz | 10mhz | 2048khz | e1 | t1)
5. For BITS interface, configure the T1 interface-specific options—the framing statement as esf or sf and the line-encoding statement as ami or b8zs.
  [edit chassis synchronization interfaces (external-a | external-b)] user@host# set t1-options framing (esf | sf) user@host# set t1-options line-encoding (ami | b8zs)

Configure the maximum transmit quality level as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc.

content_copy zoom_out_map
[edit chassis synchronization]
user@host# set max-transmit-quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc)

Configure the EEC synchronization networking type as option-1 or option-2.
```
[edit chassis synchronization]
user@host# set network-option (option-1 | option-2)
```
Configure the options for the external clock interface output on the basis of the type of Enhanced Switch Control Board on your MX Series router.
For SCBE:
1. Go to the [edit chassis synchronization output interfaces external] hierarchy level.
  [edit chassis synchronization] user@host# edit output interfaces external
2. Configure all the external clock interface output options. The options include the holdover-mode-disable statement; the minimum-quality statement, which can be set as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the source-mode statement, which can be set as chassis or line; the tx-dnu-to-line-source-enable statement; and the wander-filter-disable statement.
  [edit chassis synchronization output interfaces external] user@host# set holdover-mode-disable user@host# set minimum-quality (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc) user@host# set source-mode (chassis | line) user@host# set tx-dnu-to-line-source-enable user@host# set wander-filter-disable
For SCBE2:
1. Go to the [edit chassis synchronization output interfaces external-0/0] hierarchy level or the [edit chassis synchronization output interfaces external-1/0] hierarchy level.
  [edit chassis synchronization] user@host# edit output interfaces (external-0/0 | external-1/0)
2. Configure all the external clock interface output options on the external-0/0 interface or the external-1/0 interface. The options include the holdover-mode-disable statement; the minimum-quality statement, which can be set as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the source-mode option, which can be set as chassis or line; the tx-dnu-to-line-source-enable statement; and the wander-filter-disable statement.
  [edit chassis synchronization output interfaces (external-0/0 | external-1/0)] user@host# set holdover-mode-disable user@host# set minimum-quality (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc) user@host# set source-mode (chassis | line) user@host# set tx-dnu-to-line-source-enable user@host# set wander-filter-disable
For MX2020 Control Board:
1. Go to the [edit chassis synchronization output interfaces external-a] hierarchy level or the [edit chassis synchronization output interfaces external-b] hierarchy level.
  [edit chassis synchronization] user@host# edit output interfaces (external-a | external-b)
2. Configure all the external clock interface output options on the external-a interface or the external-b interface. The options include the holdover-mode-disable statement; the minimum-quality statement, which can be set as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the source-mode option, which can be set as chassis or line; the tx-dnu-to-line-source-enable statement; and the wander-filter-disable statement.
  [edit chassis synchronization output interfaces (external-a | external-b)] user@host# set holdover-mode-disable user@host# set minimum-quality (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc) user@host# set source-mode (chassis | line) user@host# set tx-dnu-to-line-source-enable user@host# set wander-filter-disable
Configure the time-of-day message format as ASCII on the auxiliary port that receives the external clock signals.
```
[edit chassis synchronization]
user@host# set port auxiliary client time-of-day-format ascii string
```
Configure the quality-mode-enable statement to enable Synchronous Ethernet ESMC quality mode.
```
[edit chassis synchronization]
user@host# set quality-mode-enable
```
Configure the selection mode for the incoming ESMC quality as configured-quality or received-quality.
```
[edit chassis synchronization]
user@host# set selection-mode (configured-quality | received-quality)
```
Configure the options for the ESMC source related external clock source interface on the basis of the type of Enhanced Switch Control Board on your MX Series router.
For SCBE:
1. Go to the [edit chassis synchronization source interfaces external] hierarchy level or the [edit chassis synchronization source interfaces ethernet-interface-name] hierarchy level.
  [edit chassis synchronization] user@host# edit source interfaces external
  OR
  [edit chassis synchronization] user@host# edit source interfaces ethernet-interface-name
2. Configure the external clock interface and the Ethernet interface with their options. Configure the priority statement from 1 through 5; the quality-level statement as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the request statement as force-switch or lockout; the wait-to-restore statement from 0 minutes to 12 minutes; and the hold-off-time statement from 300 through 1800 milliseconds. You can configure the same options for the Ethernet interfaces as well.
  [edit chassis synchronization source interfaces (external | ethernet-interface-name)] user@host# set priority value user@host# set quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc) user@host# set request (force-switch | lockout) user@host# set wait-to-restore minutes user@host# set hold-off-time time
For SCBE2 Control Board:
1. Go to the [edit chassis synchronization source interfaces (external-0/0] hierarchy level or the [edit chassis synchronization source interfaces (external-1/0] hierarchy level.
  [edit chassis synchronization] user@host# edit source interfaces external-0/0
  OR
  [edit chassis synchronization] user@host# edit source interfaces external-1/0
2. Configure the options on the external-0/0 interface or the external-1/0 interface. Set the priority statement from 1 through 5; the quality-level statement as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the request statement as force-switch or lockout; the wait-to-restore statement from 0 minutes to 12 minutes; and the hold-off-time statement from 300 through 1800 milliseconds.
  [edit chassis synchronization source interfaces (external-0/0 |external-1/0)] user@host# set priority value user@host# set quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc) user@host# set request (force-switch | lockout) user@host# set wait-to-restore minutes user@host# set hold-off-time time
For MX2020 Control Board:
1. Go to the [edit chassis synchronization source interfaces (external-a] hierarchy level or the [edit chassis synchronization source interfaces (external-b] hierarchy level.
  [edit chassis synchronization] user@host# edit source interfaces external-a
  OR
  [edit chassis synchronization] user@host# edit source interfaces external-b
2. Configure the options on the external-a interface or the external-b interface. Set the priority statement from 1 through 5; the quality-level statement as prc, prs, sec, ssu-a, ssu-b, st2, st3e, stu, or tnc; the request statement as force-switch or lockout; the wait-to-restore statement from 0 minutes to 12 minutes; and the hold-off-time statement from 300 through 1800 milliseconds.
  [edit chassis synchronization source interfaces (external-a |external-b)] user@host# set priority value user@host# set quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e | stu | tnc) user@host# set request (force-switch | lockout) user@host# set wait-to-restore minutes user@host# set hold-off-time time

Configure the switchover mode as revertive or non-revertive.

content_copy zoom_out_map
[edit chassis synchronization]
user@host# set switchover-mode (non-revertive | revertive)

Display the External Clock Synchronization Configuration for SCB

Purpose
Action

Purpose

Display the options for external clock synchronization for SCB.

Action

Execute the show command at [edit chassis] hierarchy level.

content_copy zoom_out_map
[edit chassis]
user@host# show
synchronization {
    clock-mode (auto-select | free-run);
    esmc-transmit {
        interfaces (all | <interface-name>);
    }
    hold-interval {
        configuration-change <seconds>;
        restart <seconds>;
        switchover <seconds>;
    }
    interfaces <interface-name> {
        hold-off-time <time>;
			  priority <number>;
        quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc);
        request (force-switch | lockout);
        wait-to-restore <minutes>;
    }
}
    max-transmit-quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e |stu | tnc);    # Applicable from 13.3 onwards
    network-type (option-1 | option-2);
    quality-mode-enable;
    selection-mode (configured-quality | received-quality);
    source {
        (external-a | external-b) {
        priority <number>;
        quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc);
        request (force-switch | lockout);
    }
    switchover-mode (revertive | non-revertive);
}

Display the External Clock Synchronization Configuration for SCBE

Purpose
Action

Purpose

Display the options for external clock synchronization for SCBE. Note that the SCBE has only one external interface.

Action

Execute the show command at [edit chassis] hierarchy level.

content_copy zoom_out_map
[edit chassis]
user@host# show
synchronization {
    clock-mode (auto-select | free-run);
    esmc-transmit {
        interfaces (all | <interface-name>);
    }
    hold-interval {
        configuration-change <seconds>;
        restart <seconds>;
        switchover <seconds>;
    }
    interfaces {
        external {
            e1-options {
                framing (g704 | g704-no-crc4);
                line-encoding (ami | hdb3);
                sabit <number>;
            }
            pulse-per-second-enable;
            signal-type (1mhz | 5mhz | 10mhz | 2048khz | t1 | e1);
            t1-options {
                framing (esf | sf);
                line-encoding (ami | b8zs);
            }
        }
    }
    max-transmit-quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e |stu | tnc);   # Applicable from 13.3 onwards
    network-option (option-1 | option-2);
    output {
        interfaces {
            external {
                holdover-mode-disable;
                minimum-quality (prc | prs | sec | smc | ssu-a | ssu-b |st2 | st3 | st3e | st4 | stu | tnc);
                source-mode (chassis | line);
                tx-dnu-to-line-source-enable;
                wander-filter-disable;
            }
       }
    }
    port {
        auxiliary client {
           time-of-day-format {
               ascii <string>;
           }
        }
    }
    quality-mode-enable;
    selection-mode (configured-quality | received-quality);
    source {
        interfaces (<interface-name> | external) {
				hold-off-time <time>;
				priority <number>;
           	quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc);
           	request (force-switch | lockout);
			wait-to-restore <minutes>;
        }
    }
    switchover-mode (revertive | non-revertive);
}

Display the External Clock Synchronization Configuration for SCBE2

Purpose
Action

Purpose

Display the options for external clock synchronization for SCBE2. SCBE2 has two external interfaces, external-0/0 and external-1/0.

Action

Execute the show command at [edit chassis] hierarchy level.

content_copy zoom_out_map
[edit chassis]
user@host# show
synchronization {
    clock-mode (auto-select | free-run);
    esmc-transmit {
        interfaces (all | <interface-name>);
    }
    hold-interval {
        configuration-change <seconds>;
        restart <seconds>;
        switchover <seconds>;
    }
    interfaces {
        (external-0/0 | external-1/0) {
            signal-type (1mhz | 5mhz | 10mhz | 2048khz | t1 | e1);
            e1-options {
                framing (g704 | g704-no-crc4);
                line-encoding (ami | hdb3);
                sabit <number>;
            }
            pulse-per-second-enable;
            t1-options {
                framing (esf | sf);
                line-encoding (ami | b8zs);
            }
        }
    }
    max-transmit-quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e |stu | tnc);
    network-option (option-1 | option-2);
    output {
        interfaces {
            (external-0/0 | external-1/0) {
                holdover-mode-disable;
                minimum-quality (prc | prs | sec | smc | ssu-a | ssu-b |st2 | st3 | st3e | st4 | stu | tnc);
                source-mode (chassis | line);
                tx-dnu-to-line-source-enable;
                wander-filter-disable;
            }
       }
    }
    port {
        auxiliary client {
           time-of-day-format {
               ascii <string>;
           }
        }
    }
    quality-mode-enable;
    selection-mode (configured-quality | received-quality);
    source {
        interfaces {
            (external-0/0 | external-1/0 | <interface-name>) {
                hold-off-time <time>;
										priority <number>;
                quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc);
                request (force-switch | lockout);
                wait-to-restore <minutes>;
        }
    }
    switchover-mode (revertive | non-revertive);
}

Displaying the External Clock Synchronization Configuration for MX2020 Control Board

Purpose
Action

Purpose

Display the options for external clock synchronization for MX2020 Control Board. MX2020 Control Board has two external interfaces, external-a and external-b.

Action

Execute the show command at [edit chassis] hierarchy level.

content_copy zoom_out_map
[edit chassis]
user@host# show
synchronization {
    clock-mode (auto-select | free-run);
    esmc-transmit {
        interfaces (all | <interface-name>);
    }
    hold-interval {
        configuration-change <seconds>;
        restart <seconds>;
        switchover <seconds>;
    }interfaces {
        (external-a | external-b) {
            signal-type (1mhz | 5mhz | 10mhz | 2048khz | t1 | e1);
            e1-options {
                framing (g704 | g704-no-crc4);
                line-encoding (ami | hdb3);
                sabit <number>;
            }
            pulse-per-second-enable;
            t1-options {
                framing (esf | sf);
                line-encoding (ami | b8zs);
            }
        }
    }max-transmit-quality-level (prc | prs | sec | ssu-a | ssu-b | st2 | st3e |stu | tnc);
    network-option (option-1 | option-2);
    output {
        interfaces {
            (external-a | external-b) {
                holdover-mode-disable;
                minimum-quality (prc | prs | sec | smc | ssu-a | ssu-b |st2 | st3 | st3e | st4 | stu | tnc);
                source-mode (chassis | line);
                tx-dnu-to-line-source-enable;
                wander-filter-disable;
            }
       }
    }
    port {
        auxiliary client {
           time-of-day-format {
               ascii <string>;
           }
        }
    }
    quality-mode-enable;
    selection-mode (configured-quality | received-quality);
    source {
        interfaces {
            (external-a | external-b | <interface-name>) {
                hold-off-time <time>;
										priority <number>;
                quality-level (prc | prs |sec | smc | ssu-a | ssu-b | st2 | st3 | st3e | st4 | stu | tnc);
                request (force-switch | lockout);
                wait-to-restore <minutes>;
        }
    }
    switchover-mode (revertive | non-revertive);
}

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Configure Clock Synchronization Interface on MX Series Routers

Configuring Clock Synchronization Options

Display the External Clock Synchronization Configuration for SCB

Purpose

Action

Display the External Clock Synchronization Configuration for SCBE

Purpose

Action

Display the External Clock Synchronization Configuration for SCBE2

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Action

Displaying the External Clock Synchronization Configuration for MX2020 Control Board

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Timing and Synchronization Guide

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Configure Clock Synchronization Interface on MX Series Routers

Configuring Clock Synchronization Options

Display the External Clock Synchronization Configuration for SCB

Purpose

Action

Display the External Clock Synchronization Configuration for SCBE

Purpose

Action

Display the External Clock Synchronization Configuration for SCBE2

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Displaying the External Clock Synchronization Configuration for MX2020 Control Board

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