Step 1 | enable
Example:
Router> enable
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Enables privileged EXEC mode.
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Enter your password if prompted.
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Step 2 | configure terminal
Example:
Router# configure terminal
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Enters global configuration mode.
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Step 3 | network-clock synchronization automatic
Example:
Router(config)# network-clock synchronization automatic
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Enables the network clock selection algorithm. This command disables the Cisco-specific network clock process and turns on the G.781-based automatic clock selection process.
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Step 4 | network-clock eec {1 | 2}
Example:
Router(config)# network-clock eec 1
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Specifies the Ethernet Equipment Clock (EEC) type. Valid values are
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1—ITU-T G.8262 option 1 (2048)
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2—ITU-T G.8262 option 2 and Telcordia GR-1244 (1544)
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Step 5 | network-clock synchronization ssm option {1 | 2 {GEN1 | GEN2}}
Example:
Router(config)# network-clock synchronization ssm option 2 GEN2
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Configures the G.781 synchronization option used to send synchronization messages. The following guidelines apply for this command:
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Option 1 refers to G.781 synchronization option 1, which is designed for Europe. This is the default value.
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Option 2 refers to G.781 synchronization option 2, which is designed for the United States.
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GEN1 specifies option 2 Generation 1 synchronization.
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GEN2 specifies option 2 Generation 2 synchronization.
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Step 6 | network-clock input-source priority {interface interface_name slot/card/port | ptp domain domain_num | {external {R0 | R1 [ { t1 {sf | esf } linecode {ami | b8zs} line-build-out length} | e1 [crc4 | fas] [125ohm | 75ohm] linecode [hdb3 | ami] } | 10m] }}
Example:
Router(config)# network-clock input-source 1 interface GigabitEthernet 0/0/1
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Enables you to select an interface as an input clock for the router. You can select the BITS, Gigabit Ethernet 0/0, Gigabit Ethernet 0/1 interfaces, or GPS interfaces, or an external interface.
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Step 7 | network-clock synchronization mode ql-enabled
Example:
Router(config)# network-clock synchronization mode ql-enabled
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Enables automatic selection of a clock source based on quality level (QL).
Note
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This command is disabled by default. |
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Step 8 | network-clock hold-off {0 | milliseconds}
Example:
Router(config)# network-clock hold-off 0
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(Optional) Configures a global hold-off timer specifying the amount of time that the router waits when a synchronous Ethernet clock source fails before taking action.
Note
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You can also specify a hold-off value for an individual interface using the network-clock hold-off command in interface mode. |
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Step 9 | network-clock wait-to-restore seconds
Example:
Router(config)# network-clock wait-to-restore 70
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(Optional) Configures a global wait-to-restore timer for synchronous Ethernet clock sources. The timer specifies how long the router waits before including a restored clock source in the clock selection process.
Valid values are 0 to 86400 seconds. The default value is 300 seconds.
Note
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You can also specify a wait-to-restore value for an individual interface using the network-clock wait-to-restore command in interface mode. |
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Step 10 | network-clock revertive
Example:
Router(config)# network-clock revertive
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(Optional) Sets the router in revertive switching mode when recovering from a failure. To disable revertive mode, use the no form of this command.
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Step 11 | esmc process
Example:
Router(config)# esmc process
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Enables the ESMC process globally.
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Step 12 | network-clock external slot/card/port hold-off {0 | milliseconds}
Example:
Router(config)# network-clock external 0/1/0 hold-off 0
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Overrides the hold-off timer value for the external interface.
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Step 13 | network-clock quality-level {tx | rx} value {interface interface-name slot/card/port | controller [E1| BITS] slot/card/port |
external
[2m | 10m] }
Example:
Router(config)# network-clock quality-level rx qL-pRC external R0 e1 cas crc4
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Specifies a quality level for a line or external clock source.
The available quality values depend on the G.781 synchronization settings specified by the network-clock synchronization ssm option command:
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Option 1—Available values are QL-PRC, QL-SSU-A, QL-SSU-B, QL-SEC, and QL-DNU.
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Option 2, GEN1—Available values are QL-PRS, QL-STU, QL-ST2, QL-SMC, QL-ST4, and QL-DUS.
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Option 2, GEN 2—Available values are QL-PRS, QL-STU, QL-ST2, QL-TNC, QL-ST3, QL-SMC, QL-ST4, and QL-DUS.
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Step 14 | interface type number
Example:
Router(config)# interface GigabitEthernet 0/0/1
Example:
Router(config-if)#
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Enters interface configuration mode.
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Step 15 | synchronous mode
Example:
Router(config-if)# synchronous mode
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Configures the Ethernet interface to synchronous mode and automatically enables the ESMC and QL process on the interface.
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Step 16 | esmc mode [ql-disabled | tx | rx] value
Example:
Router(config-if)# esmc mode rx QL-STU
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Enables the ESMC process at the interface level. The no form of the command disables the ESMC process.
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Step 17 | network-clock hold-off {0 | milliseconds}
Example:
Router(config-if)# network-clock hold-off 0
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(Optional) Configures an interface-specific hold-off timer specifying the amount of time that the router waits when a synchronous Ethernet clock source fails before taking action.
You can configure the hold-off time to either 0 or any value between 50 to 10000 ms. The default value is 300 ms.
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Step 18 | network-clock wait-to-restore seconds
Example:
Router(config-if)# network-clock wait-to-restore 70
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(Optional) Configures the wait-to-restore timer for an individual synchronous Ethernet interface.
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Step 19 | end
Example:
Router(config-if)# end
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Exits interface configuration mode and returns to privileged EXEC mode.
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