Router(config)# [no] network-clock synchronization automatic
Example:
Router(config)# network-clock synchronization automatic
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Enables G.781 based automatic clock selection process. G.781 is the ITU-T Recommendation that specifies the synchronization layer functions.
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Router(config)# [no] network-clock eec {1 | 2}
Example:
Router(config)# network-clock eec 1
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Configures the clocking system hardware with the desired parameters. These are the options:
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For option 1, the default value is EEC-Option 1 (2048).
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For option 2, the default value is EEC-Option 2 (1544).
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Router(config)# [no] network-clock synchronization ssm option {1| 2 {GEN1 | GEN2}}
Example:
Router(config)# network-clock synchronization ssm option 2 GEN1
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Configures the router to work in a synchronized network mode, as described in G.781. The following are the options:
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Option 1: Refers to synchronization networks designed for Europe (SDH/ E1 framings are compatible with this option).
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Option 2: Refers to synchronization networks designed for the US (SONET/T1 framings are compatible with this option).
The default option is 1. While choosing option 2, you must specify whether it is second-generation message (GEN2) or first-generation message (GEN1).
Note
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Network clock configurations that are not common between options should be configured again. |
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Router(config)# [no] network-clock synchronization mode QL-enabled
Example:
Router(config)# network-clock synchronization mode QL-enabled
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Configures the automatic selection process for quality-level QL-enabled mode.
Note
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QL-enabled mode succeeds only if there are any synchronization interfaces that are capable of sending SSM. |
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Router(config)# [no] esmc process
Example:
Router(config)# esmc process
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Enables or disables the ESMC process at the system level.
Note
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This command fails if no SyncE-capable interface is installed on the platform. |
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Router(config)# network-clock hold-off {0 | <50-10000>} global
Example:
Router(config)# network-clock hold-off 75 global
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Configures general hold-off timer in milliseconds. The default value is 300 milliseconds.
Note
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Displays a warning message for values below 300 ms and above 1800 ms. |
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Router(config)# network-clock external <slot/card/port> hold-off {0 | <50-10000>}
Example:
Router(config)# network-clock external 3/1/1 hold-off 300
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Overrides hold-off timer value for external interface.
Note
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Displays a warning message for values above 1800 ms, as waiting longer causes the clock to go into the holdover mode. |
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Router(config)# network-clock wait-to-restore <0-86400> global
Example:
Router(config)# network-clock external wait-to-restore 1000 global
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Sets the value for the wait-to-restore timer globally.
The wait to restore time is configurable in the range of 0 to 86400 seconds. The default value is 300 seconds.
Caution
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Ensure that you set the wait-to-restore values above 50 seconds to avoid a timing flap.
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Router(config)# [no] network-clock input-source <priority> {interface <interface_name> <slot/card/port> | top <slot/card/port/session> | {external <slot/card/port> [t1 {sf | efs | d4} | e1 [crc4| fas| cas [crc4] | 2m | 10m]}}
Example:
Router(config)# network-clock input-source 23 top 2/0/1/3
Example for GPS interface:
Router(config)# network-clock input-source 1 external 3/0/0 10m
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Configures a clock source line interface, an external timing input interface, GPS interface, or a packet-based timing recovered clock as the input clock for the system and defines its priority. Priority is a number between 1 and 250.
This command also configures the type of signal for an external timing input interface. These signals are:
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T1 with Standard Frame format or Extended Standard Frame format.
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E1 with or without CRC4
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2 MHz signal
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Default for Europe or Option I is e1 crc4 if the signal type is not specified.
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Default for North America or Option II is t1 esf if signal type is not specified.
Note
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The no version of the command reverses the command configuration, implying that the priority has changed to undefined and the state machine is informed. |
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Router(config)# [no] network-clock revertive
Example:
Router(config)# network-clock revertive
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Specifies whether or not the clock source is revertive. Clock sources with the same priority are always non-revertive. The default value is non-revertive.
In non-revertive switching, a switch to an alternate reference is maintained even after the original reference recovers from the failure that caused the switch. In revertive switching, the clock switches back to the original reference after that reference recovers from the failure, independent of the condition of the alternate reference.
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Router(config)# network-clock quality-level {tx | rx} <value> {interface <interface name> <slot/card/port> | external <slot/card/port> | controller <slot/card/port>}
Example:
Router(config)# network-clock quality-level rx QL-PRC external 4/0/0 e1 crc4
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Specifies the QL value for line or external timing input or output. The value is based on a global interworking Option.
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If Option 1 is configured, the available values are QL-PRC, QL-SSU-A, QL-SSU-B, QL-SEC, and QL-DNU.
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If Option 2 is configured with GEN 2, the available values are QL-PRS, QL-STU, QL-ST2, QL-TNC, QL-ST3, QL-SMC, QL-ST4 and QL-DUS.
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If option 2 is configured with GEN1, the available values are QL-PRS, QL-STU, QL-ST2, QL-SMC, QL-ST4 and QL-DUS
Note
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This command is not supported for synchronous ethernet interfaces. |
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Router(config)# network-clock output-source line <priority> {interface <interface_name> | controller {t1 | e1} <slot/card/port>} {external <slot/card/port> [t1 {sf | efs | d4} | e1 [crc4| fas| cas [crc4] | 2m | 10m] }
Example:
Router(config)# network-clock output-source line 1 interface GigabitEthernet3/0/0
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Transmits the line clock sources to external timing output interfaces.
Note
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A line can be configured to be the output source for only one external interface. |
This command provides the station clock output as per G.781. We recommend that you use the interface level command instead of global commands. Global command should preferably be used for interfaces that do not have an interface sub mode. For more information on configuring network clock in interface level mode, see Configuring the Network Clock in Interface Configuration Mode.
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Router(config)# network-clock output-source system <priority> {external <slot/card/port> [t1 {sf | efs | d4} | e1 [crc4| fas| cas [crc4] | 2m | 10m] }
Example:
Router(config)# network-clock output-source system 55 external 3/0/1 t1 efs
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Allows transmitting the system clock to external timing output interfaces.
This command provides station clock output as per G.781. We recommend that you use the interface level command instead of global commands. Global command should preferably be used for interfaces that do not have an interface sub mode. For more information on configuring network clock in interface level mode, see Configuring the Network Clock in Interface Configuration Mode.
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Router(config)# [no] network-clock synchronization participate <slot number>
Example:
Router(config)# [no] network-clock synchronization participate 2
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Enables or disables a slot from participating in network-clock algorithm.
By default all slots are participating slots.
Note
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A slot cannot be disabled from participation if it's primary source, secondary source, or system to external is valid. |
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