Instruction/ maintenance manual of the product uBR7200 Series Cisco Systems
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CHAPTER 4-1 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 4 Troubleshooting the System This chapter contains troubleshooting information.
4-2 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Tips The SNR estimate for a cable modem installed at a headend should be between 35 dB and 39 dB.
4-3 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Verify Sync Message Interval T.
4-4 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network T o acti v ate cable modem upstream address verif ication, use the following cable interf ace conf iguration command.
4-5 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Although the binary exponential backof f algorithm operates in a distributed fashion at dif ferent CMs, the CMTS provides centralized control for the backof f algorithm.
4-6 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Caution Only a trained CMTS administrator should adjust these v alues.
4-7 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network T o conf igure per modem f ilters, use the follo wing commands in cable interf ace conf iguration mode.
4-8 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Configure the Maximum Number o.
4-9 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Verify Clear Cable Modem Reset.
4-10 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Verify Clear Cable Modem Counters T o verify whether or not the counters in the Station Maintenance List are cleared, enter the follo wing command.
4-11 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network T o conf igure this, use the following command in cable interface conf iguration mode.
4-12 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network • Using time scheduled spectrum management, the upstream channel frequency reassignment process is initiated at a conf igured time of day or week.
4-13 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Sample output: noisy1# show cable spec Group Frequency Upstream Weekly Scheduled Power Shared No.
4-14 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network Sample output: noisy1# show c.
4-15 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing Cable Modems on the HFC Network noisy1# show cable hop Upstre.
4-16 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Polling Cable Modems Sample output: noisy1# show cable hop Upstream Po.
4-17 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Polling Cable Modems Enable SNMP Configure Remote Modem Monitoring Verifying Remote Query Information T o display information from a queried modem, enter the show cable modem r emote-query command.
4-18 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses Monitoring and Maintaining Remote Querying Use the following sho w commands to gather status information about the specif ied modems.
4-19 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses • The show cable f lap-list and.
4-20 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses See the sample command output below: router# show cable modem Interface Prim Online Timing Rec QoS CPE IP address MAC address Sid State Offset Power Cable3/0/U0 1 online 2257 0.
4-21 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses Note * means the noise po wer adj.
4-22 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses See the follo wing sample for det.
4-23 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses See the following sample output o.
4-24 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses Follo wing is a response to the show cable modem maintenance command using Cisco IOS Release 12.
4-25 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses T able 4-16 Show Interface Cable Command F ield Descriptions Field Description Cable slot/port is up/.
4-26 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses drops Indicates the number of pac.
4-27 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses See the following sample output f.
4-28 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses T able 4-18 Show Interface Cable Upstream Command F ield Descriptions Field Description Cable Indicates the location of the upstream interface Upstream is up/.
4-29 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses CIR admission control (formerly: .
4-30 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses Enhanced Show Interface Upstream Output The show interface cable upstr eam command is enhanced in Cisco IOS Release 12.
4-31 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses • Counters for each type of ups.
4-32 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses See the follo wing display output.
4-33 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses See the following display for the.
4-34 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Show Cable QoS Profile Follo wing is a response to the show cable qos pr of ile command.
4-35 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists list keeps track of the cable m.
4-36 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Tips In Cisco IOS Release 12.0(7)XR2, Cisco IOS Release 12.1(1a)T1, and higher , the system supports automatic po wer adjustments.
4-37 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Follo wing is a sample response to the show cable f lap command: uBR7200# show cable flap Mac Addr CableIF Ins Hit Miss CRC P-Adj Flap Time 0010.
4-38 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists T able 4-20 Flap List Statistics Description Statistic Description MA C ID This is the MA C-layer address of a cable modem.
4-39 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Hit and Miss The HIT and MISS columns are keepaliv e polling statistics between the Cisco uBR7200 series and the cable modem.
4-40 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Troubleshoot with the Flap List.
4-41 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Set Cable Flap List Aging Y ou can specify the number of days to record and retain f lapping activity on cable modems currently in the f lap-list table.
4-42 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Set Cable Flap List Power Adjustment Threshold Y ou can specify the po wer adjustment threshold that will cause a f lap-list event to be recorded.
4-43 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Verify Cable Flap List Miss Thr.
4-44 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Customize Other Flap List Value.
4-45 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Performing Amplitude Averaging Performing Amplitude Averaging The Cisc.
4-46 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Performing Amplitude Averaging Note The threshold default is 1 dB. The tolerable v alue default is 2 dB. The po wer adjustment is 30 percent.
4-47 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Setting Downstream Test Signals The follo wing example sho ws ho w to .
4-48 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Pinging Unresponsive Cable Modems Configure PRBS Test Signals Verify T.
4-49 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Using Cable Interface Debug Commands Verify the Ping The ping docsis c.
4-50 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Using Cable Interface Debug Commands Debug Environmental Monitor Messages This command acti vates deb ugging of the Cisco uBR7200 series en vironmental monitor .
4-51 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Using Cable Interface Debug Commands T o deacti v ate debugging of cab.
4-52 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Using Cable Interface Debug Commands Debug Cable Modem Ranging Messages This command acti vates deb ugging of ranging messages from cable modems on the HFC network.
4-53 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Using Cable Interface Debug Commands Debug Spectrum Management This command activ ates deb ugging of spectrum management (frequency agility) on the HFC netw ork.
4-54 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing the Cisco uBR7246 VXR Clock Card Debug Upstream Channel Description (UCD) Messages This command acti vates deb ugging of upstream channel descriptor (UCD) messages.
4-55 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing the Cisco uBR7246 VXR Clock Card Force Alternate Clock T o select the external timing source when the clock card is in holdov er mode, use the cable clock f orce global conf iguration command.
4-56 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing the Cisco uBR7246 VXR Clock Card The follo wing sample output.
4-57 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing the Cisco uBR7246 VXR Clock Card The follo wing is sample out.
4-58 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Managing the Cisco uBR7246 VXR Clock Card Show Clock Frames T o display information about the midplane TDM clock reference, use the show frame-clocks pri vile ged EXEC command.
An important point after buying a device Cisco Systems uBR7200 Series (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Cisco Systems uBR7200 Series yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Cisco Systems uBR7200 Series - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Cisco Systems uBR7200 Series you will learn all the available features of the product, as well as information on its operation. The information that you get Cisco Systems uBR7200 Series will certainly help you make a decision on the purchase.
If you already are a holder of Cisco Systems uBR7200 Series, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Cisco Systems uBR7200 Series.
However, one of the most important roles played by the user manual is to help in solving problems with Cisco Systems uBR7200 Series. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Cisco Systems uBR7200 Series along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
