Cisco ASR 9000 Series Aggregation Services Router System Management Configuration Guide, Release 5.1.x
Configuring Frequency Synchronization on the Cisco ASR 9000 Series Router
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Configuring Frequency Synchronization on the Cisco ASR 9000 Series Router

Frequency Synchronization is used to distribute precision frequency around a network. This module describes the tasks required to configure frequency synchronization on the Cisco IOS XR software.

For more information about frequency synchronization on the Cisco IOS XR software and complete descriptions of the commands listed in this module, see Additional References. To locate documentation for other commands that might appear in the course of running a configuration task, search online in Cisco ASR 9000 Series Aggregation Services Router Commands Master List.

Table 1 Feature History for Implementing Frequency Synchronization on Cisco IOS XR Software

Release

Modification

Release 3.9.0

This feature was introduced.

This module contains the following topics:

Information About Frequency Synchronization

Frequency or timing synchronization is the ability to distribute precision frequency around a network. In this context, timing refers to precision frequency, not an accurate time of day. Precision frequency is required in next generation networks for applications such as circuit emulation. To achieve compliance to ITU specifications for TDM, differential method circuit emulation must be used, which requires a known, common precision frequency reference at each end of the emulated circuit.

The incumbent example of frequency synchronization is provided by SDH and SONET equipment. This is used in conjunction with an external timing technology (such as Cesium oscillators or GPS) to provide synchronization of precision timing across the network. As, increasingly, SDH and SONET equipment is replaced by Ethernet equipment this frequency synchronization ability is required over Ethernet ports. Synchronous Ethernet (SyncE) provides the Ethernet physical layer network level frequency distribution of known common precision frequency references.

To maintain SyncE links, a set of operations messages are required. These messages ensure a node is always deriving timing from the most reliable source, and transfers information about the quality of the timing source being used to clock the SyncE link. In SONET/SDH networks, these are known as Synchronization Status Messages (SSM). SyncE uses Ethernet Synchronization Message Channel (ESMC) to provide transport for SSMs.

Frequency Synchronization Timing Concepts

The Cisco IOS XR frequency synchronization infrastructure is used to select between different time sources to set the router backplane frequency and time-of-day. There are two important concepts that must be understood with respect to the frequency synchronization implementation.

Sources

A source is a piece of hardware that inputs frequency signals into the system or transmits them out of the system. There are four types of sources:

  • Line interfaces. This includes SyncE interfaces and SONET interfaces.
  • Clock interfaces. These are external connectors for connecting other timing signals, such as BITS, UTI and GPS.
  • PTP clock. If IEEE 1588 version 2 is configured on the router, a PTP clock may be available to frequency synchronization as a source of the time-of-day and frequency.
  • Internal oscillator. This is a free-running internal oscillator chip.

Each timing source has a Quality Level (QL) associated with it which gives the accuracy of the clock. This QL information is transmitted across the network via SSMs over the Ethernet Synchronization Messaging Channel (ESMC) or SSMs contained in the SONET/SDH frames so that devices know the best available source to synchronize to. In order to define a preferred network synchronization flow, and to help prevent timing loops, you can assign priority values to particular timing sources on each router. The combination of QL information and user-assigned priority levels allows each router to choose a timing source to use to clock its SyncE and SONET/SDH interfaces, as described in the ITU standard G.781.

Selection Points

A selection point is any point where a choice is made between several frequency signals, and possibly one or more of them are selected. Selection points form a graph representing the flow of timing signals between the different cards in a router running Cisco IOS XR software. For example, one or multiple selection points select between the different Synchronous Ethernet inputs available on a single line card, and the result of these selection points is forwarded to a selection point on the RSP to select between the selected source from each card.

The input signals to the selection points can be:

  • Received directly from a source.
  • The output from another selection point on the same card.
  • The output from a selection point on a different card.

Note that the output of a selection point can be used in a number of ways:

  • To drive the signals sent out of a set of sources.
  • As input into another selection point on the card.
  • As input into a selection point on another card.

Use the show frequency synchronization selection command to see a detailed view of the different selection points within the system.

Configuring Frequency Synchronization

Enabling Frequency Synchronization on the Router

This task describes the router-level configuration required to enable frequency synchronization.

SUMMARY STEPS

    1.    configure

    2.    frequency synchronization

    3.    clock-interface timing-mode {independent | system

    4.    quality itu-t option {1 | 2 generation {1 | 2}}

    5.    log selection {changes | errors}

    6.    Use one of these commands:

    • end
    • commit


DETAILED STEPS
      Command or Action Purpose
    Step 1 configure


    Example:
    RP/0/RSP0/CPU0:router# configure
     

    Enters global configuration mode.

     
    Step 2 frequency synchronization


    Example:
    RP/0/RSP0/CPU0:router(config)# frequency synchronization
     

    Enables frequency synchronization on the router.

     
    Step 3 clock-interface timing-mode {independent | system


    Example:
    RP/0/RSP0/CPU0:router(config-freqsync)# clock-interface 
    timing-mode system
     

    (Optional) Configures the type of timing sources that can be used to drive the output from a clock interface. If this command is not used, the default quality mode is used. In the default mode, the clock interface output is driven only by input from line interfaces and the internal oscillator; it is never driven by input from another clock interface. In addition, some heuristic tests are run to detect if the signal being sent out of one clock interface can be looped back by some external box and sent back in via the same, or another clock interface.

    • independent—Specifies that the output of clock interfaces is driven only by the line interfaces (SyncE and SONET/SDH), as in the default mode. Loopback detection is disabled.
    • system—Specifies that the output of a clock interface is driven by the system-selected timing source (the source used to drive all SyncE and SONET/SDH interfaces), including clock interfaces. Loopback detection is disabled.
     
    Step 4 quality itu-t option {1 | 2 generation {1 | 2}}


    Example:
    RP/0/RSP0/CPU0:router(config-freqsync)# quality itu-t 
    option 2 generation 1
     

    (Optional) Specifies the quality level for the router. The default is option 1.

    • option 1—Includes PRC, SSU-A, SSU-B, SEC and DNU.
    • option 2 generation 1—Includes PRS, STU, ST2, ST3, SMC, ST4, RES and DUS.
    • option 2 generation 2—Includes PRS, STU, ST2, ST3, TNC, ST3E, SMC, ST4, PROV and DUS.
    Note   

    The quality option configured here must match the quality option specified in the quality receive and quality transmit commands in interface frequency synchronization configuration mode.

     
    Step 5 log selection {changes | errors}


    Example:
    RP/0/RSP0/CPU0:router(config-freqsync)# log selection changes
     

    Enables logging to frequency synchronization.

    • changes—Logs every time there is a change to the selected source, in addition to errors.
    • errors—Logs only when there are no available frequency sources, or when the only available frequency source is the internal oscillator.
     
    Step 6 Use one of these commands:
    • end
    • commit


    Example:
    RP/0/RSP0/CPU0:router(config-freqsync)# end

    or

    RP/0/RSP0/CPU0:router(config-freqsync)# commit
     

    Saves configuration changes.

    • When you issue the end command, the system prompts you to commit changes:
      Uncommitted changes found, commit them
      before exiting(yes/no/cancel)? [cancel]:
      
      • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.
      • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.
      • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.
    • Use the commit command to save the configuration changes to the running configuration file, and remain within the configuration session.
     
    What to Do Next

    Configure frequency synchronization on any interfaces that should participate in frequency synchronization.

    Configuring Frequency Synchronization on an Interface

    By default, there is no frequency synchronization on line interfaces. Use this task to configure an interface to participate in frequency synchronization.

    Before You Begin

    You must enable frequency synchronization globally on the router.

    SUMMARY STEPS

      1.    configure

      2.    interface type interface-path-id

      3.    frequency synchronization

      4.    selection input

      5.    priority priority-value

      6.    wait-to-restore minutes

      7.    ssm disable

      8.    time-of-day-priority priority

      9.    quality transmit {exact | highest | lowest} itu-t option ql-option

      10.    quality receive {exact | highest | lowest} itu-t option ql-option

      11.    Use one of these commands:

      • end
      • commit


    DETAILED STEPS
        Command or Action Purpose
      Step 1 configure


      Example:
      RP/0/RSP0/CPU0:router# configure
       

      Enters global configuration mode.

       
      Step 2 interface type interface-path-id


      Example:
      RP/0/RSP0/CPU0:router(config)# interface GigabitEthernet0/1/1/0
       

      Enters interface configuration mode.

       
      Step 3 frequency synchronization


      Example:
      RP/0/RSP0/CPU0:router(config-if)# frequency synchronization
       

      Enables frequency synchronization on the interface and enters interface frequency synchronization mode to configure the various options. By default, this causes the system selected frequency signal to be used for clocking transmission, but does not enable the use of the interface as an input.

       
      Step 4 selection input


      Example:
      RP/0/RSP0/CPU0:router(config-if-freqsync)# selection input
       

      (Optional) Specifies the interface as a timing source to be passed to the selection algorithm.

       
      Step 5 priority priority-value


      Example:
      RP/0/RSP0/CPU0:router(config-if-freqsync)# priority 100
       

      (Optional) Configures the priority of the frequency source on a controller or an interface. Values can range from 1 (highest priority) to 254 (lowest priority). The default value is 100.

      This command is used to set the priority for an interface or clock interface. The priority is used in the clock-selection algorithm to choose between two sources that have the same quality level (QL). Lower priority values are preferred.

       
      Step 6 wait-to-restore minutes


      Example:
      RP/0/RSP0/CPU0:router(config-if-freqsync)# wait-to-restore 300
       

      (Optional) Configures the wait-to-restore time, in minutes, for frequency synchronization on an interface. This is the amount of time after the interface comes up before it is used for synchronization. Values can range from 0 to 12. The default value is 5.

       
      Step 7 ssm disable


      Example:
      RP/0/RSP0/CPU0:router(config-if-freqsync)# ssm disable
       
      (Optional) Disables Synchronization Status Messages (SSMs) on the interface.
      • For SyncE interfaces, this disables sending ESMC packets, and ignores any received ESMC packets.
      • For SONET and clock interfaces, this causes DNUs to be sent, and ignores any received QL value.
       
      Step 8 time-of-day-priority priority


      Example:
      RP/0/RSP0/CPU0:router(config-if-freqsync)# time-of-day-priority 50
       

      (Optional) Specifies the priority of this time source as the time-of-day (ToD) source. The priority is used as the first criterion when selecting between sources for a time-of-day selection point. Values can range from 1 (highest priority) to 254 (lowest priority); the default value is 100.

       
      Step 9 quality transmit {exact | highest | lowest} itu-t option ql-option


      Example:
      RP/0/RSP0/CPU0:router(config-clk-freqsync)# quality transmit 
      highest itu-t option 1 prc
       

      (Optional) Adjusts the QL that is transmitted in SSMs.

      • exact ql—Specifies the exact QL to send, unless DNU would otherwise be sent.
      • highest ql—Specifies an upper limit on the QL to be sent. If the selected source has a higher QL than the QL specified here, this QL is sent instead.
      • lowest ql—Specifies a lower limit on the QL to be sent. If the selected source has a lower QL than the QL specified here, DNU is sent instead.

      The quality option specified in this command must match the globally-configured quality option in the quality itu-t option command.

      Note   

      For clock interfaces that do not support SSM, only the lowest QL can be specified. In this case, rather than sending DNU, the output is squelched, and no signal is sent.

       
      Step 10 quality receive {exact | highest | lowest} itu-t option ql-option


      Example:
      RP/0/RSP0/CPU0:router(config-clk-freqsync)# quality receive 
      highest itu-t option 1 prc
       

      (Optional) Adjusts the QL value that is received in SSMs, before it is used in the selection algorithm.

      • exact ql—Specifies the exact QL regardless of the value received, unless the received value is DNU.
      • highest ql—Specifies an upper limit on the received QL. If the received value is higher than this specified QL, this QL is used instead.
      • lowest ql—Specifies a lower limit on the received QL. If the received value is lower than this specified QL, DNU is used instead.

      The quality option specified in this command must match the globally-configured quality option in the quality itu-t option command.

      Note   

      For clock interfaces that do not support SSM, only the exact QL can be specified.

       
      Step 11 Use one of these commands:
      • end
      • commit


      Example:
      RP/0/RSP0/CPU0:router(config-if-freqsync)# end

      or

      RP/0/RSP0/CPU0:router(config-if-freqsync)# commit
       

      Saves configuration changes.

      • When you issue the end command, the system prompts you to commit changes:
        Uncommitted changes found, commit them
        before exiting(yes/no/cancel)? [cancel]:
        
        • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.
        • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.
        • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.
      • Use the commit command to save the configuration changes to the running configuration file, and remain within the configuration session.
       

      Configuring Frequency Synchronization on a Clock Interface

      To enable a clock interface to be used as frequency input or output, you must configure the port parameters and frequency synchronization, as described in this task.

      Note


      The configuration on clock interfaces must be the same for corresponding clock interfaces across all RSPs to avoid changes in frequency synchronization behavior in the event of an RSP switchover.


      SUMMARY STEPS

        1.    configure

        2.    clock-interface sync port-no location node-id

        3.    port-parameters {bits-input mode | bits-output mode | dti}

        4.    frequency synchronization

        5.    selection input

        6.    priority priority-value

        7.    wait-to-restore minutes

        8.    ssm disable

        9.    time-of-day-priority priority

        10.    quality transmit {exact | highest | lowest} itu-t option ql-option

        11.    quality receive {exact | highest | lowest} itu-t option ql-option

        12.    Use one of these commands:

        • end
        • commit


      DETAILED STEPS
          Command or Action Purpose
        Step 1 configure


        Example:
        RP/0/RSP0/CPU0:router# configure
         

        Enters global configuration mode.

         
        Step 2 clock-interface sync port-no location node-id


        Example:
        RP/0/RSP0/CPU0:router(config)# clock-interface sync 2 location 0/2/0
         

        Enters clock interface configuration mode to configure the clock interface.

         
        Step 3 port-parameters {bits-input mode | bits-output mode | dti}


        Example:
        RP/0/RSP0/CPU0:router(config-clock-if)# port-parameters dti
         

        Specifies the type of external clock source for the clock interface. Options are BITS RX, BITS TX or DTI. The possible mode values for BITS interfaces are 2m, 6m-output-only, e1 or t1.

         
        Step 4 frequency synchronization


        Example:
        RP/0/RSP0/CPU0:router(config-clock-if)# frequency synchronization
        RP/0/RSP0/CPU0:router(config-clk-freqsync)#
         

        Enters clock interface frequency synchronization mode to configure frequency synchronization parameters.

        Note   

        The remaining steps in this task are the same as those used to configure the interface frequency synchronization.

         
        Step 5 selection input


        Example:
        RP/0/RSP0/CPU0:router(config-if-freqsync)# selection input
         

        (Optional) Specifies the interface as a timing source to be passed to the selection algorithm.

         
        Step 6 priority priority-value


        Example:
        RP/0/RSP0/CPU0:router(config-if-freqsync)# priority 100
         

        (Optional) Configures the priority of the frequency source on a controller or an interface. Values can range from 1 (highest priority) to 254 (lowest priority). The default value is 100.

        This command is used to set the priority for an interface or clock interface. The priority is used in the clock-selection algorithm to choose between two sources that have the same quality level (QL). Lower priority values are preferred.

         
        Step 7 wait-to-restore minutes


        Example:
        RP/0/RSP0/CPU0:router(config-if-freqsync)# wait-to-restore 300
         

        (Optional) Configures the wait-to-restore time, in minutes, for frequency synchronization on an interface. This is the amount of time after the interface comes up before it is used for synchronization. Values can range from 0 to 12. The default value is 5.

         
        Step 8 ssm disable


        Example:
        RP/0/RSP0/CPU0:router(config-if-freqsync)# ssm disable
         
        (Optional) Disables Synchronization Status Messages (SSMs) on the interface.
        • For SyncE interfaces, this disables sending ESMC packets, and ignores any received ESMC packets.
        • For SONET and clock interfaces, this causes DNUs to be sent, and ignores any received QL value.
         
        Step 9 time-of-day-priority priority


        Example:
        RP/0/RSP0/CPU0:router(config-if-freqsync)# time-of-day-priority 50
         

        (Optional) Specifies the priority of this time source as the time-of-day (ToD) source. The priority is used as the first criterion when selecting between sources for a time-of-day selection point. Values can range from 1 (highest priority) to 254 (lowest priority); the default value is 100.

         
        Step 10 quality transmit {exact | highest | lowest} itu-t option ql-option


        Example:
        RP/0/RSP0/CPU0:router(config-clk-freqsync)# quality transmit 
        highest itu-t option 1 prc
         

        (Optional) Adjusts the QL that is transmitted in SSMs.

        • exact ql—Specifies the exact QL to send, unless DNU would otherwise be sent.
        • highest ql—Specifies an upper limit on the QL to be sent. If the selected source has a higher QL than the QL specified here, this QL is sent instead.
        • lowest ql—Specifies a lower limit on the QL to be sent. If the selected source has a lower QL than the QL specified here, DNU is sent instead.

        The quality option specified in this command must match the globally-configured quality option in the quality itu-t option command.

        Note   

        For clock interfaces that do not support SSM, only the lowest QL can be specified. In this case, rather than sending DNU, the output is squelched, and no signal is sent.

         
        Step 11 quality receive {exact | highest | lowest} itu-t option ql-option


        Example:
        RP/0/RSP0/CPU0:router(config-clk-freqsync)# quality receive 
        highest itu-t option 1 prc
         

        (Optional) Adjusts the QL value that is received in SSMs, before it is used in the selection algorithm.

        • exact ql—Specifies the exact QL regardless of the value received, unless the received value is DNU.
        • highest ql—Specifies an upper limit on the received QL. If the received value is higher than this specified QL, this QL is used instead.
        • lowest ql—Specifies a lower limit on the received QL. If the received value is lower than this specified QL, DNU is used instead.

        The quality option specified in this command must match the globally-configured quality option in the quality itu-t option command.

        Note   

        For clock interfaces that do not support SSM, only the exact QL can be specified.

         
        Step 12 Use one of these commands:
        • end
        • commit


        Example:
        RP/0/RSP0/CPU0:router(config-if-freqsync)# end

        or

        RP/0/RSP0/CPU0:router(config-if-freqsync)# commit
         

        Saves configuration changes.

        • When you issue the end command, the system prompts you to commit changes:
          Uncommitted changes found, commit them
          before exiting(yes/no/cancel)? [cancel]:
          
          • Entering yes saves configuration changes to the running configuration file, exits the configuration session, and returns the router to EXEC mode.
          • Entering no exits the configuration session and returns the router to EXEC mode without committing the configuration changes.
          • Entering cancel leaves the router in the current configuration session without exiting or committing the configuration changes.
        • Use the commit command to save the configuration changes to the running configuration file, and remain within the configuration session.
         

        Verifying the Frequency Synchronization Configuration

        After performing the frequency synchronization configuration tasks, use this task to check for configuration errors and verify the configuration.

        SUMMARY STEPS

          1.    show frequency synchronization configuration-errors

          2.    show frequency synchronization interfaces brief

          3.    show frequency synchronization interfaces node-id

          4.    show processes fsyncmgr location node-id


        DETAILED STEPS
          Step 1   show frequency synchronization configuration-errors


          Example:
          RP/0/RSP0/CPU0:router# show frequency synchronization configuration-errors
          
          Node 0/2/CPU0:
          ==============
            interface GigabitEthernet0/2/0/0 frequency synchronization
              * Frequency synchronization is enabled on this interface, but isn't enabled globally.
          
            interface GigabitEthernet0/2/0/0 frequency synchronization quality transmit exact itu-t option 2 generation 1 PRS
              * The QL that is configured is from a different QL option set than is configured globally.
          
            

          Displays any errors that are caused by inconsistencies between shared-plane (global) and local-plane (interface) configurations. There are two possible errors that can be displayed:

          • Frequency Synchronization is configured on an interface (line interface or clock-interface), but is not configured globally. Refer to Enabling Frequency Synchronization on the Router
          • The QL option configured on some interface does not match the global QL option. Under an interface (line interface or clock interface), the QL option is specified using the quality transmit and quality receive commands. The value specified must match the value configured in the global quality itu-t option command, or match the default (option 1) if the global quality itu-t option command is not configured.

          Once all the errors have been resolved, meaning there is no output from the command, continue to the next step.

          Step 2   show frequency synchronization interfaces brief


          Example:
          RP/0/RSP0/CPU0:router# show frequency synchronization interfaces brief
          
          Flags:  > - Up                D - Down              S - Assigned for selection
                  d - SSM Disabled      x - Peer timed out    i - Init state
          
          Fl  Interface                QLrcv QLuse Pri QLsnt Source
          === ======================== ===== ===== === ===== ========================
          >Sx GigabitEthernet0/2/0/0   Fail  Fail  100 DNU   None                    
          Dd  GigabitEthernet0/2/0/1   n/a   Fail  100 n/a   None  
          
          RP/0/RSP0/CPU0:router# show frequency synchronization clock-interfaces brief
          
          Flags:  > - Up                D - Down              S - Assigned for selection
                  d - SSM Disabled      s - Output squelched  L - Looped back
          
          Node 0/0/CPU0:
          ==============
            Fl    Clock Interface     QLrcv  QLuse  Pri QLsnd  Source
            ===== =================== ====== ====== === ====== ========================
            >S    Sync0               PRC    Fail   100 SSU-B  Internal0 [0/0/CPU0]    
            >     Sync1               SSU-A  Fail   100 SSU-B  Internal0 [0/0/CPU0]    
            >S    Internal0           n/a    SSU-B  255 n/a    None                    
          
          Node 0/1/CPU0:
          ==============
            Fl    Clock Interface     QLrcv  QLuse  Pri QLsnd  Source
            ===== =================== ====== ====== === ====== ========================
            D     Sync0               None   Fail   100 SSU-B  Internal0 [0/1/CPU0]    
            D     Sync1               None   Fail   100 SSU-B  Internal0 [0/1/CPU0]    
            >S    Internal0           n/a    SSU-B  255 n/a    None                    
          
            

          Verifies the configuration. Note the following points:

          • All line interface that have frequency synchronization configured are displayed.
          • All clock interfaces and internal oscillators are displayed.
          • Sources that have been nominated as inputs (in other words, have selection input configured) have ‘S’ in the Flags column; sources that have not been nominated as inputs do not have ‘S’ displayed.
            Note   

            Internal oscillators are always eligible as inputs.

          • ‘>’ or ‘D’ is displayed in the flags field as appropriate.

          If any of these items are not true, continue to the next step.

          Step 3   show frequency synchronization interfaces node-id


          Example:
          RP/0/RSP0/CPU0:router# show frequency synchronization interfaces GigabitEthernet0/2/0/2
          
          Interface GigabitEthernet0/2/0/2 (shutdown)
            Assigned as input for selection
            SSM Enabled
            Input:
              Down
              Last received QL: Failed
              Effective QL:     Failed, Priority: 100
            Output:
              Selected source:    Sync0 [0/0/CPU0]
              Selected source QL: Opt-I/PRC
              Effective QL:       Opt-I/PRC
            Next selection points: LC_INGRESS
            
          RP/0/RSP0/CPU0:router# show frequency synchronization clock-interfaces location 0/1/CPU0
          
          Node 0/1/CPU0:
          ==============
            Clock interface Sync0 (Down: mode not configured)
              SSM supported and enabled
              Input:
                Down
                Last received QL: Opt-I/PRC
                Effective QL:     Failed, Priority: 100
              Output:
                Selected source:    Internal0 [0/1/CPU0]
                Selected source QL: Opt-I/SSU-B
                Effective QL:       Opt-I/SSU-B
            Next selection points: RP_SYSTEM
          
            Clock interface Sync1 (Down: mode not configured)
              SSM supported and enabled
              Input:
                Down
                Last received QL: Opt-I/PRC
                Effective QL:     Failed, Priority: 100
              Output:
                Selected source:    Internal0 [0/1/CPU0]
                Selected source QL: Opt-I/SSU-B
                Effective QL:       Opt-I/SSU-B
            Next selection points: RP_SYSTEM
          
            Clock interface Internal0 (Up)
              Assigned as input for selection
              Input:
                Default QL:   Opt-I/SSU-B
                Effective QL: Opt-I/SSU-B, Priority: 255
            Next selection points: RP_SYSTEM RP_CLOCK_INTF
          
            

          Investigates issues within individual interfaces. If the clock interface is down, a reason is displayed. This may be because there is missing or conflicting platform configuration on the clock interface.

          Step 4   show processes fsyncmgr location node-id


          Example:
          RP/0/RSP0/CPU0:router# show processes fsyncmgr location 0/0/CPU0
          
                            Job Id: 134
                               PID: 30202
                   Executable path: /pkg/bin/fsyncmgr
                        Instance #: 1
                        Version ID: 00.00.0000
                           Respawn: ON
                     Respawn count: 1
            Max. spawns per minute: 12
                      Last started: Mon Mar  9 16:30:43 2009
                     Process state: Run
                     Package state: Normal
                 Started on config: cfg/gl/freqsync/g/a/enable
                              core: MAINMEM 
                         Max. core: 0
                         Placement: None
                      startup_path: /pkg/startup/fsyncmgr.startup
                             Ready: 0.133s
                  Process cpu time: 1730768.741 user, -133848.-361 kernel, 1596920.380 total
            --------------------------------------------------------------------------------
          
             

          Verifies that the fsyncmgr process is running on the appropriate nodes.