Cisco Systems Clear Cable Modem and Show Cable Modem Commands for Troubleshooting

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Chapter 4 Troubleshooting the System

Managing Cable Modems on the HFC Network

Table 4-9 Instructions to Clear Cable Modem Reset

Command

Purpose

 

 

CMTS01(config-if)#clear cable modem mac-addrreset

Remove the cable modem with a specific MAC address

 

from the station maintenance list and reset it.

CMTS01(config-if)#clear cable modem ip-addrreset

Remove the cable modem with a specific IP address

 

from the station maintenance list and reset it.

CMTS01(config-if)#clear cable modem all reset

Remove all cable modems from the station

 

maintenance list and reset them.

 

 

Verify Clear Cable Modem Reset

To verify whether or not the clear cable modem reset command has removed a cable modem from the station maintenance list and forced it to start a reset sequence, enter the show cable modem command.

Tips Be sure you entered the correct cable modem IP address or MAC address when you typed the command. It might take up to 30 seconds for the cable modem to start the reset sequence.

Note This command is useful if an SNMP manager is not available, or if the cable modem is unable to obtain an IP address or respond to SNMP messages.

Clear Cable Modem Counters

To clear the counters for a cable modem (or for all cable modems) in the station maintenance list, use one of the following commands in cable interface configuration mode.

Table 4-10 Instructions to Clear Cable Modem Counters

Command

Purpose

 

 

CMTS01(config-if)#clear cable modem mac-addrcounters

Clear the counters in the station maintenance list for

 

the cable modem with a specific MAC address.

CMTS01(config-if)#clear cable modem ip-addrcounters

Clear the counters in the station maintenance list for

 

the cable modem with a specific IP address.

CMTS01(config-if)#clear cable modem all counters

Clear the counters in the station maintenance list for all

 

cable modems.

 

 

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

 

78-5897-01

4-9

 

 

 

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Contents Troubleshooting the System Managing Cable Modems on the HFC Network Configure Sync Message IntervalVerify Cable Modem Authentication Activate Cable Modem AuthenticationActivate Cable Modem Upstream Address Verification Verify Sync Message IntervalCMTS01config-if#cable source-verify dhcp CMTS01config-if#no cable source-verifyVerify Cable Modem Upstream Address Verification CMTS01config-if#cable insertion-interval max CMTS01config-if#no cable insertion-intervalCMTS01config-if#cable insertion-interval AutomaticConfigure Per Modem Filters Configure access lists to be specified on a Configure Cable Modem Registration Timeout Clear Cable Modem ResetCMTS01config-if#cable registration-timeout n Clear Cable Modem Counters Verify Clear Cable Modem ResetConfigure Downstream Rate Limiting and Shaping Configure Traffic ShapingConfigure Upstream Rate Limiting and Shaping Verify Clear Cable Modem CountersBlind Strategies and Time Scheduled Combined CMTS01config-if#nocable upstream n1 rate-limitToken-bucket CMTS01# show interface c3/0 sid 1 countersGuided 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 CommandsConfigure Remote Modem Monitoring Enable SnmpAllows you to configure access Verifying Remote Query InformationUnderstanding Show Command Responses General Show CommandsMonitoring and Maintaining Remote Querying Show Cable Modem See the sample command output below Page SID Show Cable Modem Maintenance Cable modem cable 3/0 upstream 0 unregisteredCable 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 SIDShow Router# show interface c3/0 sid counters verboseRouter# show interface c3/0 sid connectivity ConnectivityRouter# show interface c3/0 sid 1 counters Troubleshooting Using Cable Flap Lists Show Cable QoS ProfileUBR7200#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 Set Cable Flap List Insertion Time Set Cable Flap List AgingVerify Cable Flap List Aging Verify Cable Flap List Insertion TimeSet Cable Flap List Power Adjustment Threshold Verify Cable Flap List Power Adjustment ThresholdSet Cable Flap List Miss Threshold Clear Cable Flap List Set Cable Flap List SizeVerify Cable Flap List Miss Threshold Verify Cable Flap List SizeCustomize Other Flap List Values and Related Commands Performing Amplitude Averaging Enable or Disable Power AdjustmentSyntax Valid Values Set Frequency Threshold to Affect Power AdjustmentSetting Downstream Test Signals Configure Unmodulated Test SignalsStep Command Purpose Verify Test Signal Output Configure Prbs Test SignalsStep Command Pinging Unresponsive Cable ModemsUsing Cable Interface Debug Commands Verify the PingDebug Cable ARP Requests Debug Environmental Monitor Messages Debug Cable MAC Protocol ErrorsActivate Debug of Baseline Privacy Debug Baseline Privacy ActivityDebug Cable Modems Debug Cable MapsDebug Cable PHY Messages Activate QoS DebugDebug Cable Modem Ranging Messages Debug Cable Modem Reset MessagesDebug Upstream Messages Debug Cable Modem Registration RequestsDebug Channel Allocations Debug Spectrum ManagementDebug Cmts Transmissions Debug Upstream Channel Change UCC MessagesDebug Upstream Channel Description UCD Messages Managing the Cisco uBR7246 VXR Clock CardClear Clock Counters Show diag Show frame-clocks Show tech support Show versionSet Midplane TDM Clock as Primary Reference Force Alternate ClockDisplay Clock Values Cable clock force primary secondary no cable clock forceShow Clock Hardware Information and Register Values Show Clock Diagnostic InformationRouter# show cable clock Show controllers clock-reference33 describes the fields shown in the show diag display Show Clock Frames Show General InformationRouter# show frame-clocks