H3C CR16000-F Manual
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Also See for CR16000-F:
- Hardware information and procedures (289 pages) ,
- Installation manual (206 pages) ,
- Command reference manual (55 pages)
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Contents
Configuring network synchronization ···················································· 1
About network synchronization ····································································································· 1
Clock sources ····················································································································· 1
Clock source levels ·············································································································· 1
Clock reference selection ······································································································ 2
Clock mode on a port ··········································································································· 2
Network synchronization tasks at a glance ······················································································ 3
Configuring clock reference selection ····························································································· 3
Configuring BITS clocks ·············································································································· 4
Setting an Sa bit for the SSM of BITS clocks ············································································· 4
Setting the frequency of a BITS clock ····························································································· 4
Specifying a line clock input port ··································································································· 4
Configuring automatic reference selection parameters ······································································· 5
Configuring the method for setting the SSM quality level of a clock source······································· 5
Specifying an SSM quality 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 module ············································ 7
Network synchronization configuration examples ·············································································· 8
Example: Configuring network synchronization ·········································································· 8
Configuring synchronous Ethernet ······················································· 9
About synchronous Ethernet ········································································································ 9
Quality levels of clocks ········································································································· 9
Clock reference selection ······································································································ 9
System clock QL distribution and SyncE port input QL updating ···················································· 9
Protocols and standards ····································································································· 10
Restrictions and guidelines: synchronous Ethernet configuration ························································ 10
Configuring SyncE on an Ethernet interface ··················································································· 10
Display and maintenance commands for SyncE ············································································· 11
Synchronous Ethernet configuration examples ··············································································· 11
Example: Configuring synchronous Ethernet ··········································································· 11
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Summary of Contents for H3C CR16000-F
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Page 1: Table Of Contents
Contents Configuring network synchronization ···················································· 1 About network synchronization ····································································································· 1 Clock sources ····················································································································· 1 Clock source levels ·············································································································· 1 Clock reference selection ······································································································ 2 Clock mode on a port ··········································································································· 2 Network synchronization tasks at a glance ······················································································ 3 ... -
Page 2: Configuring Network Synchronization
Configuring network synchronization About network synchronization The network clock monitoring module provides network clock synchronization for all interface cards in the system. It ensures that all ports on the interface cards operate at the same clock rates for network synchronization. The network clock monitoring module provides the following functions: •... -
Page 3: Clock Reference Selection
Clock reference selection The network clock monitoring module supports automatic and manual clock reference selection. Automatic reference selection In an automatic reference selection process, the network clock monitoring module uses the SSM quality level, clock source priority, and clock source number to make a selection decision. The use of SSM in the automatic reference selection process is user configurable. -
Page 4: Network Synchronization Tasks At A Glance
• Slave—The port uses the timing signal received from the peer end. For the network clock monitoring module to extract timing signal from a port, you must place the port in slave clock mode. If the port is in master clock mode, the module does not extract the timing signal from the incoming traffic on the port. -
Page 5: Configuring Bits Clocks
It takes time for the clock reference selection mode change to take effect. To verify the effectiveness of the change, you can also check the logs. Configuring BITS clocks Setting an Sa bit for the SSM of BITS clocks About setting an Sa bit for the SSM of BITS clocks Sa bits from Sa4 through Sa8 can be used to transmit the SSM quality level of BITS timing signal. -
Page 6: Configuring Automatic Reference Selection Parameters
system view Enter interface view. interface interface-type interface-number Set the clock mode to slave. clock slave By default, slave clock mode is enabled on ports. Return to system view. quit Specify the port as a line clock input port. network-clock lpuport interface-type interface-number By default, no line clock input port is configured. -
Page 7: Specifying An Ssm Quality Level For A Clock Source
Specifying an SSM quality level for a clock source Restrictions and guidelines The SSM quality level you specify for a clock source takes effect only when manual SSM quality level assignment is enabled. Procedure Enter system view. system-view Assign an SSM quality level to a clock source. In standalone mode: network-clock source { bits0 | bits1 | lpuport interface-type interface-number | ptp } ssm { dnu | prc | sec | ssua | ssub | unknown }... -
Page 8: Display And Maintenance Commands For Network Clock Monitoring Module
Procedure Enter system view. system-view Set a priority for a clock source. In standalone mode: network-clock source { bits0 | bits1 | lpuport interface-type interface-number | ptp } priority In IRF mode: network-clock chassis chassis-number source { bits0 | bits1 | ptp } priority network-clock source lpuport interface-type interface-number priority... -
Page 9: Network Synchronization Configuration Examples
Task Command reset network-clock [ chassis chassis-number ] Network synchronization configuration examples Example: Configuring network synchronization Network configuration As shown in Figure 1, Device A obtains its timing signal from an external BITS clock. Configure Device B to derive its timing from Device A through POS 3/1/1. Figure 1 Network diagram Pos3/1/1 Pos3/1/1... -
Page 10: Configuring Synchronous Ethernet
Configuring synchronous Ethernet About synchronous Ethernet Synchronous Ethernet (SyncE) provides high-quality frequency synchronization on Ethernet at the physical layer. It can provide the same level of clock precision as SONET/SDH. Transferring frequency signals at the physical layer, SyncE functions regardless of the network conditions such as congestion, packet loss, and delay. -
Page 11: Protocols And Standards
• If the clock reference is not from a SyncE port, the system distributes the QL out of all SyncE ports. • If the clock reference is from a SyncE port, the system distributes the QL out of all SyncE ports except for the reference input port. -
Page 12: Display And Maintenance Commands For Synce
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. 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. - Page 13 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 ESMC event packets sent ESMC information rate : 1 packets/sec ESMC expiration...
- Page 14 QL received : QL-PRC QL sent : QL-DNU ESMC information packets received : 6412 ESMC information packets sent : 2573 ESMC event packets received ESMC event packets sent ESMC information rate : 1 packets/sec ESMC expiration : 5 seconds...
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