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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

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English

Configuring Precision Time Protocol

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You can configure the primary clock and the client clock for Precision Time Protocol (PTP) to help synchronize clocks in a distributed system. This time synchronization is achieved through packets that are transmitted and received in a session between the primary clock and the client clock.

Configuring PTP Options

To configure PTP options:

In configuration mode, go to the [edit protocols ptp] hierarchy level:
```
[edit]
user@host# edit protocols ptp
```
Configure the clock mode as either boundary or ordinary. This attribute is mandatory and has no default value.
The boundary option signifies that the clock can be both a primary clock and a client clock. The ordinary option signifies that the clock is either a primary clock or a client clock.
```
[edit protocols ptp]
user@host# set clock-mode (boundary | ordinary)
```
Configure the PTP domain option with values from 0 through 127. The default value is 0.
```
[edit protocols ptp]
user@host# set domain domain-value
```
Configure the priority1 option with values from 0 through 254. The default value is 128.
The priority1 value determines the best primary clock. The priority1-value is also advertised in the primary clock’s announce message to other slaves.
```
[edit protocols ptp]
user@host# set priority1 priority1-value
```
Configure the priority2 option with values from 0 through 255. The default value is 128.
The priority2 value differentiates and prioritizes the primary clock to avoid confusion when priority1-value is the same for different primary clocks in a network.
```
[edit protocols ptp]
user@host# set priority2 priority2-value
```
Configure the unicast-negotiation option to enable unicast negotiation.
Unicast negotiation is a method by which the announce, sync, and delay response packet rates are negotiated between the primary clock and the client clock before a PTP session is established.
```
[edit protocols ptp]
user@host# set unicast-negotiation
```
Note:
Unicast negotiation, when enabled, does not allow you to commit any packet rate–related configuration.

Configuring Member Clock Options

Configure the following options after the aforementioned PTP options have been set.

Configure the client clock.
```
[edit protocols ptp]
user@host# edit slave
```
Configure the announce-timeout option in the client node with values from 2 through 10. The default value is 3.
The announce timeout value signifies the number of times an announce interval message has to pass through the client without receiving the announce message—that is, the timeout period for announce messages.
```
[edit protocols ptp slave]
user@host# set announce-timeout announce-timeout-value
```
Configure the delay-request option in the client node with values from –6 through 6. The default value is –4.
The delay request value is the logarithmic mean interval in seconds between the delay request messages sent by the client to the primary.
```
[edit protocols ptp slave]
user@host# set delay-request delay-request-value
```
Configure the frequency-only option to enable only frequency synchronization in the client.
```
[edit protocols ptp slave]
user@host# set frequency-only
```
Note:
This option is configured only when PTP is used for frequency synchronization and not for phase synchronization. Also, note that this option can only be set for an ordinary clock acting as client.

Configure the interface for the client.

content_copy zoom_out_map
[edit protocols ptp slave]
user@host# edit interface interface-name

Configure the unicast-mode option for the client. You can set this option when PTP unicast mode of messaging is needed.
```
[edit protocols ptp slave interface interface-name]
user@host# edit unicast-mode
```
Configure the transport option in unicast mode as IPv4.
The encapsulation type for PTP packet transport is IPv4.
```
[edit protocols ptp slave interface interface-name unicast-mode]
user@host# set transport ipv4
```

Configure the IP address of the client.

content_copy zoom_out_map
[edit protocols ptp slave interface interface-name unicast-mode]
user@host# edit clock-source ip-address

Configure the IP address of the interface acting as the local PTP client port.
```
[edit protocols ptp slave interface interface-name unicast-mode clock-source ip-address]
user@host# set local-ip-address local-ip-address
```
Note:
You must configure this IP address at the [edit interfaces interface-name] hierarchy level.
You can configure PTP over IPv4 over a link aggregation group for MPC2E NG, MPC3E NG, MPC5E, MPC6E, MPC7E-10G, MPC7E-MRATE, MPC8E, and MPC9E.
For each aggregated Ethernet link configured as PTP client, you can specify one member link of the aggregated Ethernet bundle as primary and another as secondary.
```
[edit protocols ptp slave interface interface-name ]
user@host# set primary interface-name
user@host# set secondary interface-name
```
Starting in Junos OS Release 15.2R1, you can configure multicast mode option for the client port. In this mode, PTP over Ethernet uses multicast addresses and a client port can automatically start receiving the multicast announce messages transmitted by the primary ports on a network. The client port can start communicating with the primary port with minimal or no configuration.
```
[edit protocols ptp slave interface interface-name ]
user@host# set multicast-mode
```
Configure Ethernet as the encapsulation type of transport for the PTP packets. You can further enable 802.3 Ethernet encapsulation to use a specific set of multicast MAC addresses while transmitting the PTP packets over Ethernet.
```
[edit protocols ptp slave interface interface-name multicast-mode]
asymmetry number;
transport 802.3 link-local;
```
Note:
It is mandatory to use the transport statement while configuring the multicast-mode for primary and client interfaces.
You can configure PTP over Ethernet over a link aggregation group for MPC5E, MPC6E, MPC7E-10G, MPC7E-MRATE, MPC8E, MPC9E, and MPC10E line cards.
For each aggregated Ethernet link configured as PTP client, you can specify one member link of the aggregated Ethernet bundle as primary and another as secondary.
```
[edit protocols ptp slave interface interface-name ]
user@host# set primary interface-name
user@host# set secondary interface-name
```

Configuring Primary Clock Options

Configure the following options after the aforementioned PTP options and client clock options have been set.

Configure the primary clock.
```
[edit protocols ptp]
user@host# edit master
```
Configure the announce interval option for the primary with values from 0 through 4. The default value is 1.
The announce interval is the logarithmic mean interval between announce messages that is sent by the primary. By default, one announce message is sent in every two seconds.
```
[edit protocols ptp master]
user@host# set announce-interval announce-interval-value
```
Configure the clock step option as either one-step or two-step for the primary. The default value is one-step.
The clock step determines whether the timing information is sent along with the sync message only (one-step) or a subsequent follow-up message (two-step) is sent corresponding to the previous sync message.
```
[edit protocols ptp master]
user@host# set clock-step (one-step | two-step)
```
Configure the sync interval option for the primary clock with values from –6 through 6. The default value is –6.
The sync interval is the logarithmic mean interval between synchronous messages that is sent by the primary. By default, 64 synchronous interval messages are sent per second.
```
[edit protocols ptp master]
user@host# set sync-interval sync-interval-value
```

Configure the interface for the primary.

content_copy zoom_out_map
[edit protocols ptp master]
user@host# edit interface interface-name

Configure the unicast mode option for the primary. You can set this option when PTP unicast mode of messaging is needed.
```
[edit protocols ptp master interface interface-name]
user@host# edit unicast-mode
```
Configure the transport option in unicast mode as IPv4.
The encapsulation type for PTP packet transport is IPv4.
```
[edit protocols ptp master interface interface-name unicast-mode]
user@host# set transport ipv4
```

Configure the IP address for the client.

content_copy zoom_out_map
[edit protocols ptp master interface interface-name unicast-mode]
user@host# edit clock-client ip-address

Configure the IP address of the interface acting as the local PTP primary port.

content_copy zoom_out_map
[edit protocols ptp master interface interface-name unicast-mode clock-client ip-address]
user@host# set local-ip-address local-ip-address

You can configure PTP over IPv4 over a link aggregation group for MPC2E NG, MPC3E NG, MPC5E, MPC6E, MPC7E-10G, MPC7E-MRATE, MPC8E, and MPC9E.
For each aggregated Ethernet link configured as PTP primary, you can specify one member link of the aggregated Ethernet bundle as primary and another as secondary.
```
[edit protocols ptp master interface interface-name ]
user@host# set primary interface-name
user@host# set secondary interface-name
```
Starting with Junos OS Release 15.2R1, you can configure multicast mode option for the primary port. In this mode, PTP over Ethernet uses multicast addresses and a client port can automatically start receiving the multicast announce messages transmitted by the primary ports on a network. The client port can start communicating with the primary port with minimal or no configuration.
```
[edit protocols ptp master interface interface-name ]
user@host# set multicast-mode
```
Configure Ethernet as the encapsulation type of transport for the PTP packets. You can further enable 802.3 Ethernet encapsulation to use a specific set of multicast MAC addresses while transmitting the PTP packets over Ethernet.
```
[edit protocols ptp master interface interface-name multicast-mode]
asymmetry number;
transport 802.3 link-local;
```
Note:
It is mandatory to use the transport statement while configuring the multicast-mode for primary and client interfaces.
You can configure PTP over Ethernet over a link aggregation group for MPC5E, MPC6E, MPC7E-10G, MPC7E-MRATE, MPC8E, MPC9E, and MPC10E line cards.
For each aggregated Ethernet link configured as PTP primary, you can specify one member link of the aggregated Ethernet bundle as primary and another as secondary.
```
[edit protocols ptp master interface interface-name ]
user@host# set primary interface-name
user@host# set secondary interface-name
```

Change History Table

Feature support is determined by the platform and release you are using. Use Feature Explorer to determine if a feature is supported on your platform.

Release

Description

15.2R1

Starting in Junos OS Release 15.2R1, you can configure multicast mode option for the client port.

15.2R1

Starting with Junos OS Release 15.2R1, you can configure multicast mode option for the primary port.

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Timing and Synchronization Guide

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Configuring Precision Time Protocol

Configuring PTP Options

Configuring Member Clock Options

Configuring Primary Clock Options

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Timing and Synchronization Guide

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Configuring Precision Time Protocol

Configuring PTP Options

Configuring Member Clock Options

Configuring Primary Clock Options

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