11-Network Management and Monitoring Command Reference

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06-Network synchronization commands
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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

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-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 1 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.

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

Usage guidelines

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

Examples

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

<Sysname> system-view

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

[Sysname-Ten-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

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

<Sysname> system-view

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

[Sysname-Ten-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

Layer 3 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.

Examples

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

<Sysname> system-view

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

[Sysname-Ten-GigabitEthernet1/0/1] synchronous mode

Related commands

display esmc

esmc enable

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