Cisco Systems uBR7200 Series manual Customize Other Flap List Values and Related Commands

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Chapter 4 Troubleshooting the System

Troubleshooting Using Cable Flap Lists

Customize Other Flap List Values and Related Commands

The following displays flap list with different sorting options:

show cable modem flap-list[cable <n> sort-flap sort-time sort-interface]

The following sets the threshold value for link establishment:

[no] cable flap-list insertion-time <sec>

Note A modem is tagged as flapping if the insertion time exceeds this value. Its value can be set from 60 to 86400 seconds with a default of 180 seconds.

The following sets the number of consecutive missed station maintenance(RNG-RSP) messages that must be missed for a ‘flap’ event to occur. Value ranges from 1-12 with a default of 6 seconds. The hits and miss counters are not affected:

[no] cable flap-list miss-threshold <miss-threshold>

The following clears the counters for a cable modem (or all cable modems) in the station maintenance list:

clear cable modem { <mac-addr> <ip-addr> all } counters

The following displays the QoS, modem status, In and Out octets, IP and MAC addresses per SID:

show int cable slot/port sid

The following drops the modem's RF link by removing a modem from the keep-alive polling list. This forces the modem to reset:

clear cable-modem{ <mac-addr> <ip-addr> all } reset

The following uses a MAC layer ping to determine if the cable modem is online. It uses smaller data units on the wire than a standard IP ping, resulting in lower overhead. Works even if the IP layer in the modem is down or hasn’t completed registration:

ping DOCSIS cable-modem <mac-addr IP address >

The following displays the timing offset, receive power, and QoS values by cable interface, SID, and MAC address:

show cable modem [<ip-address> <MAC-address>]

The following displays the current allocation table and frequency assignments:

show cable spectrum-group [spectrum group number]

The following displays maximum, average, and minimum% online time and offline times for a given SID on a given Cisco uBR7200 interface:

show int slot/port sid connectivity

The following displays input and output rates, input errors, CRC, frames, overruns, underruns, collisions, interface resets. High input errors in the CMTS retrieved from this query suggests noisy upstream. In older versions of the chassis, loose midplane and line card screws caused a similar problem:

show interface slot/downstream-port

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

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Contents Troubleshooting the System Configure Sync Message Interval Managing Cable Modems on the HFC NetworkActivate Cable Modem Authentication Verify Cable Modem AuthenticationActivate Cable Modem Upstream Address Verification Verify Sync Message IntervalVerify Cable Modem Upstream Address Verification CMTS01config-if#cable source-verify dhcpCMTS01config-if#no cable source-verify CMTS01config-if#no cable insertion-interval CMTS01config-if#cable insertion-interval maxCMTS01config-if#cable insertion-interval AutomaticConfigure Per Modem Filters Configure access lists to be specified on a CMTS01config-if#cable registration-timeout n Configure Cable Modem Registration TimeoutClear Cable Modem Reset Verify Clear Cable Modem Reset Clear Cable Modem CountersConfigure Traffic Shaping Configure Downstream Rate Limiting and ShapingConfigure Upstream Rate Limiting and Shaping Verify Clear Cable Modem CountersCMTS01config-if#nocable upstream n1 rate-limit Blind Strategies and Time Scheduled CombinedToken-bucket CMTS01# show interface c3/0 sid 1 countersGuided Frequency Hop Sample output Field DescriptionSpectrum Management Debug and Test Commands Show Cable Hop Command14 Show Cable Hop Parameter Descriptions Debug and Test Commands Polling Cable ModemsEnable Snmp Configure Remote Modem MonitoringAllows you to configure access Verifying Remote Query InformationMonitoring and Maintaining Remote Querying Understanding Show Command ResponsesGeneral Show Commands Show Cable Modem See the sample command output below Page SID Cable modem cable 3/0 upstream 0 offline Show Cable Modem MaintenanceCable modem cable 3/0 upstream 0 unregistered UBR7200#show cable modem maintenance Show Interface CableMTU CRC Field Description Router# show interface cable 6/0 downstream18 Show Interface Cable Upstream Command Field Descriptions ATP Enhanced Show Interface Upstream Output Show Interface Cable SID Cable slot 3, portRouter# show interface c3/0 sid counters verbose ShowRouter# show interface c3/0 sid connectivity ConnectivityRouter# show interface c3/0 sid 1 counters UBR7200#show cable qos profile Troubleshooting Using Cable Flap ListsShow Cable QoS Profile Page Page Display the Flap List UBR7200#show cable flapStatistic Description MAC IDPlant troubleshooting. The CRC counter indicates Troubleshoot with the Flap List Set Cable Flap List Aging Set Cable Flap List Insertion TimeVerify Cable Flap List Aging Verify Cable Flap List Insertion TimeSet Cable Flap List Miss Threshold Set Cable Flap List Power Adjustment ThresholdVerify Cable Flap List Power Adjustment Threshold Set Cable Flap List Size Clear Cable Flap ListVerify Cable Flap List Miss Threshold Verify Cable Flap List SizeCustomize Other Flap List Values and Related Commands Enable or Disable Power Adjustment Performing Amplitude AveragingSet Frequency Threshold to Affect Power Adjustment Syntax Valid ValuesStep Command Purpose Setting Downstream Test SignalsConfigure Unmodulated Test Signals Configure Prbs Test Signals Verify Test Signal OutputStep Command Pinging Unresponsive Cable ModemsDebug Cable ARP Requests Using Cable Interface Debug CommandsVerify the Ping Debug Cable MAC Protocol Errors Debug Environmental Monitor MessagesActivate Debug of Baseline Privacy Debug Baseline Privacy ActivityDebug Cable Maps Debug Cable ModemsDebug Cable PHY Messages Activate QoS DebugDebug Cable Modem Reset Messages Debug Cable Modem Ranging MessagesDebug Upstream Messages Debug Cable Modem Registration RequestsDebug Spectrum Management Debug Channel AllocationsDebug Cmts Transmissions Debug Upstream Channel Change UCC MessagesManaging the Cisco uBR7246 VXR Clock Card Debug Upstream Channel Description UCD MessagesClear Clock Counters Show diag Show frame-clocks Show tech support Show versionForce Alternate Clock Set Midplane TDM Clock as Primary ReferenceDisplay Clock Values Cable clock force primary secondary no cable clock forceShow Clock Diagnostic Information Show Clock Hardware Information and Register ValuesRouter# show cable clock Show controllers clock-reference33 describes the fields shown in the show diag display Router# show frame-clocks Show Clock FramesShow General Information