Contents

Network synchronization commands· 1

display network-clock source· 1

display network-clock status· 2

network-clock ssmcontrol 4

network-clock work-mode· 4

Synchronous Ethernet commands· 6

display esmc· 6

esmc enable· 7

synce state· 8

synchronous mode· 9

Network synchronization commands

All these commands are supported on the default MDC. The network-clock ssmcontrol and network-clock work-mode manual mdc commands and the bits0 and bits1 keywords are not configurable on non-default MDCs. For more information about MDCs, see Virtual Technologies Configuration Guide.

display network-clock source

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

Syntax

In standalone mode:

display network-clock source

In IRF mode:

display network-clock source [ chassis chassis-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

chassis chassis-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays the states of clock sources on all IRF member devices.

Usage guidelines

This command displays the states of clock sources only for the current MDC.

 To display information about a line clock source, you must execute this command on the MDC that contains the line clock input port. This command does not display the line clock source if all settings of the clock source are default.

Examples

# Display the states of clock sources.

<Sysname> display network-clock source

Traced reference: XGE3/0/1

Reference   State   Priority  SSM level Force SSM Sa-Bit  LPU port  Frequency

XGE3/0/1    Normal  10        Unknown   OFF       N/A     Yes       N/A

Table 1 Command output

Field	Description
Traced reference	Traced clock source. If a clock source is traced, the network clock monitoring module distributes its timing signal to all interface cards. If no clock source has been traced, this field displays N/A.
Reference	Line clock input port, which is a link clock source. This information is displayed only when a line clock input port is configured.
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	SSM quality level in descending order: ·     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	Whether to use the manually assigned SSM quality level: ·     ON—Uses the manually assigned SSM quality level. ·     OFF—Extracts the SSM quality level from the received timing signal.
Sa bit	Sa bit used by BITS to transmit the SSM: ·     sa4—Bit Sa4. ·     sa5—Bit Sa5. ·     sa6—Bit Sa6. ·     sa7—Bit Sa7. ·     sa8—Bit Sa8. This field displays N/A for line clock sources, because line clocks do not support the Sa bit configuration.
LPU port	Whether the port is a line clock input 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. This field displays N/A for BITS 0, BITS 1, and PTP clock sources.
Frequency	Frequency of the BITS clock: ·     2 Mbps. ·     2 MHz.

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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

In standalone mode:

display network-clock status

In IRF mode:

display network-clock status [ chassis chassis-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

mdc-admin

mdc-operator

Parameters

chassis chassis-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays information for all IRF member devices.

Examples

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

<Sysname> display network-clock status

Mode              : Auto

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.
Traced reference	Clock reference that has been selected manually. This field displays N/A if no clock reference has been selected manually.
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. ·     Pre-locked2—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 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

In standalone mode:

network-clock ssmcontrol { off | on }

undo network-clock ssmcontrol

In IRF mode:

network-clock chassis chassis-number ssmcontrol { off | on }

undo network-clock chassis chassis-number ssmcontrol

Default

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

Views

System view

Predefined user roles

network-admin

Parameters

chassis chassis-number: Specifies an IRF member device by its member ID.

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.

This command is configurable only on the default MDC. However, the command setting takes effect on all MDCs.

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

In standalone mode:

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

undo network-clock work-mode

In IRF mode:

network-clock chassis chassis-number work-mode { auto | manual source }

network-clock work-mode manual source lpuport interface-type interface-number

undo network-clock chassis chassis-number work-mode

Default

Automatic reference selection mode applies.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

chassis chassis-number: Specifies an IRF member device by its member ID.

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 specify a line clock input port, use the network-clock work-mode command on the MDC that contains the port.

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

network-clock lpuport

Synchronous Ethernet commands

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

mdc-admin

mdc-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   : Ten-GigabitEthernet3/0/1

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

Layer 3 Ethernet interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

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

Examples

# Enable ESMC on Ten-GigabitEthernet 3/0/1.

<Sysname> system-view

[Sysname] interface ten-gigabitethernet 3/0/1

[Sysname-Ten-GigabitEthernet3/0/1] 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

Layer 3 Ethernet interface view

Predefined user roles

network-admin

mdc-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 Ten-GigabitEthernet 3/0/1 to operate in master mode.

<Sysname> system-view

[Sysname] interface ten-gigabitethernet 3/0/1

[Sysname-Ten-GigabitEthernet3/0/1] 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

Layer 3 Ethernet interface view

Predefined user roles

network-admin

mdc-admin

Usage guidelines

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

Examples

# Enable the synchronous mode on Ten-GigabitEthernet 3/0/1.

<Sysname> system-view

[Sysname] interface ten-gigabitethernet 3/0/1

[Sysname-Ten-GigabitEthernet3/0/1] synchronous mode

Related commands

display esmc

esmc enable