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H3C CR16000-F, Руководство пользователя

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11 

By default, Ethernet interfaces are in the non-synchronous mode. An interface can participate 
in the clock reference selection only when it is in the synchronous mode. 

4. 

Enable ESMC to transmit QL information. 

esmc enable

   

By default, ESMC is disabled on Ethernet interfaces. 

Display and maintenance commands for SyncE 

Execute 

display

 commands in any view. 

 

Task Command 

Display ESMC information. 

display esmc 

[

 

interface

 

interface-type 

interface-number

 

]

 

 

Synchronous Ethernet configuration examples 

Example: Configuring synchronous Ethernet 

Network configuration 

As shown in 

Figure 2

, configure SyncE between the devices. 

Figure 2 Network diagram 

 

 

Procedure 

# On Device A, enable the synchronous mode and ESMC on Ten-GigabitEthernet 3/1/1. 

<DeviceA> system-view 

[DeviceA] interface ten-gigabitethernet 3/1/1 

[DeviceA-Ten-GigabitEthernet3/1/1] synchronous mode 

[DeviceA-Ten-GigabitEthernet3/1/1] esmc enable 

[DeviceA-Ten-GigabitEthernet3/1/1] quit 

# On Device B, enable the synchronous mode and ESMC on Ten-GigabitEthernet 3/1/1. 

<DeviceB> system-view 

[DeviceB] interface ten-gigabitethernet 3/1/1 

[DeviceB-Ten-GigabitEthernet3/1/1] synchronous mode 

[DeviceB-Ten-GigabitEthernet3/1/1] esmc enable 

[DeviceB-Ten-GigabitEthernet3/1/1] quit 

Verifying the configuration 

# Verify that ESMC is enabled on both Device A and Device B when they are connected to their 
respective clock references. The clock QLs of Device A and Device B are 

QL-PRC

 and 

QL-SEC

, 

respectively. Device A provides more precise timing than Device B.   

[DeviceA] display esmc 

Interface   :  Ten-GigabitEthernet3/1/1 

Содержание CR16000-F

Страница 1: ...ity level for a clock source 6 Controlling the use of SSM in automatic reference selection 6 Setting a priority for a clock source 6 Display and maintenance commands for network clock monitoring modul...

Страница 2: ...he WAN port is called a line processing unit LPU port Line timing signal is less precise than BITS timing signal PTP Timing signal obtained through PTP PTP timing signal is less precise than BITS timi...

Страница 3: ...nce When the signal of the best clock source can be traced again the module selects the best clock source to replace the less optimal clock source as the reference NOTE A clock source will not be sele...

Страница 4: ...rence selection Setting a priority for a clock source Configuring clock reference selection Restrictions and guidelines To use the timing signal from an interface as the synchronization reference you...

Страница 5: ...source bits0 bits1 sa bit sa4 sa5 sa6 sa7 sa8 By default BITS clocks use Sa 4 to transmit the SSM Setting the frequency of a BITS clock About setting the frequency of a BITS clock You can set the fre...

Страница 6: ...the received timing signal Uses the SSM quality level manually assigned as described in Specifying an SSM quality level for a clock source Procedure 1 Enter system view system view 2 Configure the met...

Страница 7: ...odule display network clock source It takes time for the SSM quality level change to take effect To verify the effectiveness of the change you can also check the logs Controlling the use of SSM in aut...

Страница 8: ...f test result of the network clock monitoring module In standalone mode display network clock self test result In IRF mode display network clock self test result chassis chassis number Display the ope...

Страница 9: ...ter 2 On Device B Specify POS 3 1 1 as a line clock input port DeviceB system view DeviceB network clock lpuport pos 3 1 1 Specify the slave clock mode on the POS interface DeviceB interface pos 3 1 1...

Страница 10: ...A G 812 primary level SSU SSU B G 812 second level SSU SEC SDH equipment clock DNU Do not use for synchronization UNK Synchronization quality unknown DNU clock sources cannot participate in clock refe...

Страница 11: ...262 Timing Characteristics of a Synchronous Ethernet Equipment Slave Clock EEC ITU T G 8264 Y 1364 Distribution of Timing Information through Packet Networks Restrictions and guidelines synchronous Et...

Страница 12: ...e the synchronous mode and ESMC on Ten GigabitEthernet 3 1 1 DeviceA system view DeviceA interface ten gigabitethernet 3 1 1 DeviceA Ten GigabitEthernet3 1 1 synchronous mode DeviceA Ten GigabitEthern...

Страница 13: ...sent 1 ESMC information rate 1 packets sec ESMC expiration 5 seconds Verify that QL information is exchanged correctly after synchronization between Device A and Device B Ten GigabitEthernet 3 1 1 on...

Страница 14: ...QL PRC QL sent QL DNU ESMC information packets received 6412 ESMC information packets sent 2573 ESMC event packets received 1 ESMC event packets sent 1 ESMC information rate 1 packets sec ESMC expira...

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