Cisco Systems uBR7200 Series Force Alternate Clock, Set Midplane TDM Clock as Primary Reference

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Chapter 4 Troubleshooting the System

Managing the Cisco uBR7246 VXR Clock Card

Force Alternate Clock

To select the external timing source when the clock card is in holdover mode, use the cable clock force global configuration command. To disable the selection and return to the default, use the no form of this command.

cable clock force {primary secondary} no cable clock force

Setting the cable clock to primary forces the primary source to act as the clock reference. Setting the cable clock to secondary forces the secondary source to act as the clock reference.

The clock card automatically uses the primary external source, if available. If the primary source fails, the clock card enters holdover mode and after a few seconds, switches to the secondary external source. The clock card switches back to the primary source when it becomes available.

Note This command overrides the default behavior of the clock card, when the clock card is in holdover mode. If the clock card is not in holdover mode, this command is ignored. You cannot force the reference to a port if the clock card is in free-running mode. The clock card enters holdover mode if the forced reference is lost, even if the other external reference is available.

Set Midplane TDM Clock as Primary Reference

To make the midplane TDM clock the primary timing reference for the clock card, use the cable clock source-midplaneglobal configuration command. To disable the selection and return to the default, use the no form of this command.

cable clock source-midplane

Note Because the clock card automatically provides the timing reference to the midplane TDM clock, the midplane cannot in turn act as the reference for the clock card. This means that the cable clock source-midplanecommand does not take effect unless a port adapter is configured as the primary clock reference source for the midplane.

Caution Although the cable clock source-midplanecommand is configurable, it is ignored, until a port adapter that can serve as the midplane clock reference source is supported in the Cisco uBR7246 VXR. Currently, there are no port adapters on the Cisco uBR7246 VXR that support this.

Display Clock Values

To display clock reference status information for the clock card, use the show cable clock privileged EXEC command:

show cable clock

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

 

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Contents Troubleshooting the System Managing Cable Modems on the HFC Network Configure Sync Message IntervalVerify Sync Message Interval Activate Cable Modem AuthenticationVerify Cable Modem Authentication Activate Cable Modem Upstream Address VerificationCMTS01config-if#no cable source-verify CMTS01config-if#cable source-verify dhcpVerify Cable Modem Upstream Address Verification Automatic CMTS01config-if#no cable insertion-intervalCMTS01config-if#cable insertion-interval max CMTS01config-if#cable insertion-intervalConfigure Per Modem Filters Configure access lists to be specified on a Clear Cable Modem Reset Configure Cable Modem Registration TimeoutCMTS01config-if#cable registration-timeout n Clear Cable Modem Counters Verify Clear Cable Modem ResetVerify Clear Cable Modem Counters Configure Traffic ShapingConfigure Downstream Rate Limiting and Shaping Configure Upstream Rate Limiting and ShapingCMTS01# show interface c3/0 sid 1 counters CMTS01config-if#nocable upstream n1 rate-limitBlind Strategies and Time Scheduled Combined Token-bucketGuided Frequency Hop Field Description Sample outputShow Cable Hop Command Spectrum Management Debug and Test Commands14 Show Cable Hop Parameter Descriptions Polling Cable Modems Debug and Test CommandsVerifying Remote Query Information Enable SnmpConfigure Remote Modem Monitoring Allows you to configure accessGeneral Show Commands Understanding Show Command ResponsesMonitoring and Maintaining Remote Querying Show Cable Modem See the sample command output below Page SID Cable modem cable 3/0 upstream 0 unregistered Show Cable Modem MaintenanceCable modem cable 3/0 upstream 0 offline Show Interface Cable UBR7200#show cable modem maintenanceMTU CRC Router# show interface cable 6/0 downstream Field Description18 Show Interface Cable Upstream Command Field Descriptions ATP Enhanced Show Interface Upstream Output Cable slot 3, port Show Interface Cable SIDConnectivity Router# show interface c3/0 sid counters verboseShow Router# show interface c3/0 sid connectivityRouter# show interface c3/0 sid 1 counters Show Cable QoS Profile Troubleshooting Using Cable Flap ListsUBR7200#show cable qos profile Page Page UBR7200#show cable flap Display the Flap ListMAC ID Statistic DescriptionPlant troubleshooting. The CRC counter indicates Troubleshoot with the Flap List Verify Cable Flap List Insertion Time Set Cable Flap List AgingSet Cable Flap List Insertion Time Verify Cable Flap List AgingVerify Cable Flap List Power Adjustment Threshold Set Cable Flap List Power Adjustment ThresholdSet Cable Flap List Miss Threshold Verify Cable Flap List Size Set Cable Flap List SizeClear Cable Flap List Verify Cable Flap List Miss ThresholdCustomize Other Flap List Values and Related Commands Performing Amplitude Averaging Enable or Disable Power AdjustmentSyntax Valid Values Set Frequency Threshold to Affect Power AdjustmentConfigure Unmodulated Test Signals Setting Downstream Test SignalsStep Command Purpose Pinging Unresponsive Cable Modems Configure Prbs Test SignalsVerify Test Signal Output Step CommandVerify the Ping Using Cable Interface Debug CommandsDebug Cable ARP Requests Debug Baseline Privacy Activity Debug Cable MAC Protocol ErrorsDebug Environmental Monitor Messages Activate Debug of Baseline PrivacyActivate QoS Debug Debug Cable MapsDebug Cable Modems Debug Cable PHY MessagesDebug Cable Modem Registration Requests Debug Cable Modem Reset MessagesDebug Cable Modem Ranging Messages Debug Upstream MessagesDebug Upstream Channel Change UCC Messages Debug Spectrum ManagementDebug Channel Allocations Debug Cmts TransmissionsShow diag Show frame-clocks Show tech support Show version Managing the Cisco uBR7246 VXR Clock CardDebug Upstream Channel Description UCD Messages Clear Clock CountersCable clock force primary secondary no cable clock force Force Alternate ClockSet Midplane TDM Clock as Primary Reference Display Clock ValuesShow controllers clock-reference Show Clock Diagnostic InformationShow Clock Hardware Information and Register Values Router# show cable clock33 describes the fields shown in the show diag display Show General Information Show Clock FramesRouter# show frame-clocks