SyncE Configuration

Introduction

SyncE is a synchronization technique based on carrying and recovering frequency information from physical layer code streams. It can choose whether the device uses its own crystal frequency or the crystal frequency obtained from the peer-to-peer port. It is common to use SyncE in conjunction with the PTP technique to simultaneously meet the requirements of high accuracy in both frequency and phase, and to achieve nanosecond time synchronization.

SyncE configuration

Configuring the interface SyncE mode

The interface is master by default after enabling SyncE, and it is recommended that the interface SyncE mode is the same as PTP mode.

Operation	Command	Description
Enter the interface configuration view	interface ethernet interface_num
Configure SyncE mode	synce mode {master|slave}

Configuring SyncE Priority

When more than one interface enables SyncE, the interface with the highest priority is used as the selected.

Operation	Command	Description
Enter the interface configuration view	interface ethernet interface_num
Configure SyncE priority	synce priority {priority}	Assignable value range 0-255, the smaller the value the higher the priority

Display and Maintenance

Operation	Command
Display SyncE status of device	show synce status
Display Synce information of interface	show ptp interface status interface_num

SyncE Configuration Example

Network requirements

In this network, Device B uses the crystal frequency of the peer Device A. Configure the interface on which Device B interconnects with Device A as slave. (When multiple interfaces interconnect, select the interface with the lowest priority to synchronize the clock signals).

Procedure

# Device A

sonic(config)# interface ethernet 1
sonic(config-if-1)# synce enable
sonic(config-if-1)# synce mode master

# Device B

sonic(config)# interface ethernet 1
sonic(config-if-1)# synce enable
sonic(config-if-1)# synce mode slave
sonic(config-if-1)# synce priority 10

Verify configuration

# Display SyncE information of interface on Device B

sonic# show ptp interface 1
SyncE Enable: true
SyncE Mode: slave
SyncE Priority: 10

# Display SyncE status on Device B

sonic# show synce status
 Interface  Enable    Mode    Priority   Selected
----------- -------- ------ ---------- ------------
 Ethernet1   true     slave      10      selected

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