Contents

Network synchronization commands· 1

display network-clock source· 1

display network-clock status· 2

network-clock source forcessm·· 3

network-clock source priority· 4

network-clock source ssm·· 4

network-clock ssmcontrol 5

network-clock work-mode· 6

Synchronous Ethernet commands· 8

display esmc· 8

esmc enable· 9

synce state· 10

synchronous mode· 10

Network synchronization commands

Only the IE4300-28P-M and IE4320-28P switches support network synchronization.

Network synchronization is not supported between IRF member devices.

display network-clock source

Use display network-clock source to display the states of clock sources.

Syntax

display network-clock source

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display the states of clock sources.

<Sysname> display network-clock source

Port       State  Priority  SSM level  Force SSM  LPU port

Pos3/1/1   Normal 10        Unknown    OFF        Yes

Cpos4/1/9  Normal 15        Unknown    ON         No

Table 1 Command output

Field	Description
Port	Line clock input port.
State	State of the clock source: ·     Normal—The clock source is operating correctly. ·     Lost—The clock source is not available or is in an error condition. ·     N/A—PTP is used for time synchronization.
Priority	Priority of the clock source.
SSM level	Clock source quality level in the SSM, by descending order of quality: ·     PRC—G.811 primary reference clock. ·     SSU-A—G.812 primary-level SSU. ·     SSU-B—G.812 second-level SSU. ·     SEC—SDH equipment clock. ·     DNU—Do not use for synchronization. ·     Unknown—Unknown quality level.
Force SSM	Method for setting the quality of the clock source: ·     ON—Sets the clock source's quality level to the user-assigned SSM value. ·     OFF—Extracts the SSM quality level from the timing signal sent by the clock source.
LPU port	Line clock input role of the port: ·     Yes—The port has been specified as a line clock input port. ·     No—The port is not specified as a line clock input port.

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display network-clock status

Use display network-clock status to display the operating state of the network clock monitoring module.

Syntax

display network-clock status

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display the operating state of the network clock monitoring module.

<Sysname> display network-clock status

Mode              : Auto

Reference         : N/A

Traced reference  : N/A

Lock mode         : Unknown

SSM output level  : SSUB

SSM control enable: On

Table 2 Command output

Field	Description
Mode	Clock reference selection mode: ·     Auto—Automatic reference selection. ·     Manual—Manual reference selection.
Reference	Line clock input port
Traced reference	Clock reference that has been selected and traced. This field displays N/A if no clock reference has been selected.
Lock mode	Phase lock state of the clock monitoring module: ·     Freerun—Freerun mode. ·     Locked—Locked (traced) mode. ·     Holdover—Holdover state. ·     Pre-locked—Pre-locked mode. ·     Lost—The clock signal has been lost. ·     Unknown—No timing signal is available. The network clock monitoring module is in an exceptional condition.
SSM output level	Signal quality level of the clock source in the SSM, by descending order of quality: ·     PRC—G.811 primary reference clock. ·     SSU-A—G.812 primary-level SSU. ·     SSU-B—G.812 second-level SSU. ·     SEC—SDH equipment clock. ·     DNU—Do not use for synchronization. ·     Unknown—Unknown quality level.
SSM control enable	Contribution of SSM to automatic reference selection: ·     On—SSM is used in the selection process. ·     Off—SSM is not used in the selection process.

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network-clock source forcessm

Use network-clock source forcessm to configure the method for setting the quality level of a clock source.

Use undo network-clock source forcessm to restore the default.

Syntax

network-clock source { lpuport interface-type interface-number | ptp } forcessm { off | on }

undo network-clock source { lpuport interface-type interface-number | ptp } forcessm

Default

The network clock monitoring module sets the quality level of a clock source to the user-assigned value. It does not extract the quality level from the SSM sent by the clock source.

Views

System view

Predefined user roles

network-admin

Parameters

lpuport interface-type interface-number: Specifies a line clock. The interface-type interface-number arguments specify the type and number of the line clock input port.

ptp: Specifies the Precision Timing Protocol (PTP).

off: Sets the quality level of a clock source to the value extracted from the SSM sent by the clock source.

on: Sets the quality level of a clock source to the user-assigned value.

Examples

Examples

# Extract the SSM level of the PTP clock source from the received timing signal.

<Sysname> system-view

[Sysname] network-clock source ptp forcessm off

Related commands

display network-clock source

network-clock source priority

Use network-clock source priority to set the priority of a clock source.

Use undo network-clock source priority to restore the default.

Syntax

network-clock source { lpuport interface-type interface-number | ptp } priority priority

undo network-clock source { lpuport interface-type interface-number | ptp } priority

Default

All clock sources have a priority of 255.

Views

System view

Predefined user roles

network-admin

Parameters

lpuport interface-type interface-number: Specifies a line clock. The interface-type interface-number arguments specify the type and number of the line clock input port.

ptp: Specifies PTP.

priority priority: Sets a priority value in the range of 1 to 255. The lower the value, the higher quality the timing signal.

Examples

# Assign a priority of 3 to PTP clock source.

<Sysname> system-view

[Sysname] network-clock source PTP priority 3

Related commands

display network-clock source

network-clock source ssm

Use network-clock source ssm to assign an SSM quality level to a clock source.

Use undo network-clock source ssm to restore the default.

Syntax

network-clock source { lpuport interface-type interface-number | ptp } ssm { dnu | prc | sec | ssua | ssub | unknown }

undo network-clock source { lpuport interface-type interface-number | ptp } ssm

Default

The SSM quality level is unknown for all clock sources.

Views

System view

Predefined user roles

network-admin

Parameters

lpuport interface-type interface-number: Specifies a line clock. The interface-type interface-number arguments specify the type and number of the line clock input port.

ptp: Specifies the PTP.

dnu: Sets the SSM quality level to DNU SSM quality level. DNU clock sources cannot participate in automatic clock reference selection.

prc: Sets the SSM quality level to G.811 primary reference clock.

sec: Sets the SSM quality level to SDH equipment clock.

ssua: Sets the SSM quality level to G.812 primary-level SSU.

ssub: Sets the SSM quality level to G.812 second-level SSU.

unknown: Sets the SSM quality level to unknown.

Usage guidelines

For the manually assigned SSM quality level to take effect, you must configure the network-clock source forcessm on command.

It takes time for an SSM quality level change to take effect. To verify the effectiveness of the change, use the display network-clock source command or check the log.

Examples

# Set the SSM quality level of PTP clock source to DNU.

<Sysname> system-view

[Sysname] network-clock source PTP ssm dnu

network-clock ssmcontrol

Use network-clock ssmcontrol to control the use of SSM quality level in the automatic reference selection process.

Use undo network-clock ssmcontrol to restore the default.

Syntax

network-clock ssmcontrol { off | on }

undo network-clock ssmcontrol

Default

The SSM quality level is ignored in the automatic reference selection process.

Views

System view

Predefined user roles

network-admin

Parameters

off: Ignores the SSM quality level in clock reference selection.

on: Includes the SSM quality level as a factor for clock reference selection.

Usage guidelines

This command takes effect for automatic clock reference selection.

Examples

# Include the SSM quality level into the automatic clock reference selection process.

<Sysname> system-view

[Sysname] network-clock ssmcontrol on

Related commands

display network-clock source

network-clock ssm

network-clock work-mode

Use network-clock work-mode to set the clock reference selection mode.

Use undo network-clock work-mode to restore the default.

Syntax

network-clock work-mode { auto | manual source { lpuport interface-type interface-number  }

undo network-clock work-mode

Default

Automatic reference selection mode applies.

Views

System view

Predefined user roles

network-admin

Parameters

auto: Enables automatic reference selection.

manual source: Enables manual reference selection.

lpuport interface-type interface-number: Specifies a line clock input port as the reference. The interface-type interface-number arguments specify an interface by its type and number.

Usage guidelines

To use the timing signal from an interface as the synchronization reference, you must also specify the interface as a line clock input port by using the network-clock lpuport command.

It takes time for a clock reference selection mode change to take effect. To verify the effectiveness of the change, use the display network-clock status command or check the log.

Examples

# Enable automatic reference selection.

<Sysname> system-view

[Sysname] network-clock work-mode auto

Related commands

display network-clock source

display network-clock status

Synchronous Ethernet commands

Only the IE4300-28P-M and IE4320-28P switches support Synchronous Ethernet.

Synchronous Ethernet  is not supported between IRF member devices.

display esmc

Use display esmc to display ESMC information.

Syntax

display esmc [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, the command displays ESMC information for all interfaces.

Usage guidelines

ESMC information is not available for interfaces in asynchronous mode.

Examples

# Display ESMC information for all interfaces.

<Sysname> display esmc

Interface   : GigabitEthernet1/0/1

Mode        : Synchronous

ESMC status : Enable

Port status : Up

Duplex mode : Full

QL received : QL-SEC

QL sent     : QL-PRC

ESMC information packets received : 2195

ESMC information packets sent     : 6034

ESMC event packets received       : 1

ESMC event packets sent           : 16

ESMC information rate             : 1 packets/sec

ESMC expiration                   : 5 seconds

Table 3 Command output

Field	Description
Interface	Interface that receives ESMC information.
Mode	Ethernet interface mode: ·     Synchronous—Synchronous mode. Non-Synchronous—Asynchronous mode.
ESMC status	Whether ESMC is enabled: ·     Enable—ESMC is enabled. ·     Disable—ESMC is disabled.
QL received QL sent	Quality level in the ESMC packet most recently received or sent on the interface: ·     PRC—G.811 primary reference clock. ·     SSU-A—G.812 primary-level SSU. ·     SSU-B—G.812 second-level SSU. ·     SEC—SDH equipment clock. ·     DNU—Do not use for synchronization. ·     UNK—Unknown quality level.
ESMC information packets received ESMC information packets sent	Number of received or sent ESMC information packets.
ESMC event packets received ESMC event packets sent	Number of received or sent ESMC event packets.
ESMC information rate	Transmission rate of ESMC information packets. The value is fixed at 1 pps.
ESMC expiration	ESMC expiration timer. The timer is fixed at 5 seconds.

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Related commands

esmc enable

synchronous mode

esmc enable

Use esmc enable to enable the Ethernet synchronization messaging channel (ESMC) on an Ethernet interface.

Use undo esmc enable to disable the Ethernet synchronization messaging channel (ESMC) on an Ethernet interface.

Syntax

esmc enable

undo esmc enable

Default

ESMC is disabled on Ethernet interfaces.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

Before you can enable ESMC, you must configure the interface to operate in synchronous mode.

Examples

# Enable ESMC on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] esmc enable

Related commands

display esmc

synchronous mode

synce state

Use synce state to set the clock mode on a copper GE port.

Use undo synce state to restore the default.

Syntax

synce state { master | slave }

undo synce state

Default

The clock mode of a GE copper port is automatically negotiated.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Parameters

master: Specifies the master clock mode.

slave: Specifies the slave clock mode.

Usage guidelines

To avoid a negotiation result that conflicts with your clock synchronization trail design, manually set the clock mode.

·     To derive timing from the upstream clock, set the clock mode to slave.

·     To provide timing for the downstream clock, set the clock mode to master.

Examples

# Configure GigabitEthernet 1/0/1 to operate in master mode.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] synce state master

synchronous mode

Use synchronous mode to enable the synchronous mode on an Ethernet interface.

Use undo synchronous mode to restore the default.

Syntax

synchronous mode

undo synchronous mode

Default

Ethernet interfaces are regular Ethernet interfaces in non-synchronous mode. They do not extract timing signals, send, forward, or process ESMC packets.

Views

Layer 2 Ethernet interface view

Predefined user roles

network-admin

Usage guidelines

You can configure an interface as a line clock input port only after you enable the synchronous mode on the interface.

GigabitEthernet 1/0/25 to GigabitEthernet 1/0/28 on the IE4320-28P switch do not support this command.

Examples

# Enable the synchronous mode on GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface gigabitethernet 1/0/1

[Sysname-GigabitEthernet1/0/1] synchronous mode

Related commands

display esmc

esmc enable