Cisco uBR7200 Series - Manuals

Page 2 - Managing Cable Modems on the HFC Network; Configure Sync Message Interval; Command

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 and39 dB. Although the exact value displaye...

Page 3 - Verify Sync Message Interval; Activate Cable Modem Authentication; Verify Cable Modem Authentication; Activate Cable Modem Upstream Address Verification

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 To verify whether or not a sync message interval is configured, enter the show running-configcommand ...

Page 4 - Verify Cable Modem Upstream Address Verification

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 To activate cable modem upstream address verification, use the following cable interface configurationcommand. Verify Cable Modem ...

Page 5 - Configure the Dynamic Map Advance Algorithm

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 backoff algorithm operates in a distributed fashion at different CMs,the CMTS provides centralized...

Page 6 - Configure Per Modem Filters

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 values. To configure the dynamic map advance algorithm, use the foll...

Page 8 - Configure the Maximum Number of Hosts Attached to a Cable Modem

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 of Hosts Attached to a Cable Modem To specify the maximum number of hosts that can be attached to a s...

Page 9 - Verify Clear Cable Modem Reset; Clear Cable Modem Counters

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 To verify whether or not the clear cable modem reset command has removed a cable modem from thestat...

Page 10 - Verify Clear Cable Modem Counters; Configure Traffic Shaping; Configure Downstream Rate Limiting and Shaping; Configure Upstream Rate Limiting and Shaping

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 To verify whether or not the counters in the Station Maintenance List are cleared, enter the fo...

Page 11 - Blind Strategies and Time Scheduled Combined

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 To configure this, use the following command in cable interface configuration mode. Using Cisco IOS Release 12.0(5)T1 or higher, ...

Page 12 - Guided Frequency Hop

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 reassignmentprocess is initiated at a configured time ...

Page 13 - Field

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. Band Port Availability Level Spe...

Page 14 - Spectrum Management Debug and Test Commands; Show Cable Hop Command

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 cable hop Upstream Port Poll Missed Min Missed Hop Hop Corr Uncorr Port Status Rate Poll Poll Poll Thr...

Page 16 - Debug and Test Commands; Polling Cable Modems

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 Port Poll Missed Min Missed Hop Hop Corr Uncorr Port Status Rate Poll Poll Poll Thres Period FEC FEC (m...

Page 17 - Enable SNMP

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 To display information from a queried modem, enter the show cable mo...

Page 18 - Monitoring and Maintaining Remote Querying; Understanding Show Command Responses; General Show Commands; show cable modem

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 show commands to gather status information about the specified modems. U...

Page 19 - Show Cable Modem

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 flap-list and show cable modem commands now indicate when the CiscouBR7200 series router has detected an unstable re...

Page 23 - Show Cable Modem Maintenance

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 of unregistered modems connected on upstream channel 0 for cableinterface 3, port 0: router#show cabl...

Page 24 - Show Interface Cable

4-24 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Understanding Show Command Responses Following is a response to the show cable modem maintenance command usingCisco IOS Release 12.0(5)T1: uBR7200#show cable modem mainte...

Page 30 - Enhanced Show Interface Upstream Output

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 upstream command is enhanced in Cisco IOS Release 12.0(7)XR2,Cisco I...

Page 31 - Show Interface Cable SID

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 upstream slot scheduled in the MAPs for this upstream channel---The“Init Mtn IEs 800” means that the MAC ...

Page 34 - Show Cable QoS Profile; Troubleshooting Using Cable Flap Lists

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 Following is a response to the show cable qos profile command. The display shows ToS specifications: uBR7200...

Page 35 - cable flap-list insertion-time—180 seconds

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 modem MAC address, up and down transitions, registration events, missedperiodic ranging packets, upst...

Page 37 - Following is a sample response to the show cable flap command:; Display the Flap List

4-37 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Following is a sample response to the show cable flap command: uBR7200#show cable flap Mac Addr CableIF Ins Hit Miss CRC P-Adj Flap...

Page 38 - Statistic

4-38 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Troubleshooting Using Cable Flap Lists Table 4-20 Flap List Statistics Description Statistic Description MAC ID This is the MAC-layer address of a cable modem. The first ...

Page 40 - Troubleshoot with the Flap List

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 This section includes suggestions on how to interpret different network conditions based on the fla...

Page 41 - Set Cable Flap List Aging; Verify Cable Flap List Aging; Set Cable Flap List Insertion Time; Verify Cable Flap List Insertion Time

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 You can specify the number of days to record and retain flapping activity on cable modems currently inthe...

Page 42 - Set Cable Flap List Power Adjustment Threshold; Verify Cable Flap List Power Adjustment Threshold; Set Cable Flap List Miss Threshold

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 You can specify the power adjustment threshold that will cause a flap-list event to ...

Page 43 - Verify Cable Flap List Miss Threshold; Set Cable Flap List Size; Verify Cable Flap List Size; Clear Cable Flap List

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 Threshold To verify the cable flap list miss threshold, enter the show cable flap list command: CMTS01#...

Page 44 - Customize Other Flap List Values and Related Commands; show int cable slot/port sid

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 Values and Related Commands The following displays flap list with different sorting options: show cable m...

Page 45 - Performing Amplitude Averaging; Output of the show cable modem command appears below:; cable upstream power-adjust noise; Enable or Disable Power Adjustment; no cable upstream power-adjust

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 Cisco uBR7200 series uses an averaging algorithm to determine the optimum power level for acable modem w...

Page 46 - Set Frequency Threshold to Affect Power Adjustment; no cable upstream freq-adj averaging; Syntax

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 value default is 2 dB. The power adjustmentis 30 percent. Caution Default settings are ad...

Page 47 - Setting Downstream Test Signals; Configure Unmodulated Test Signals; Step

4-47 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Setting Downstream Test Signals The following example shows how to change the power adjustment method when the frequencyadjustment packet count reaches 50 percent: router...

Page 48 - Configure PRBS Test Signals; Pinging Unresponsive Cable Modems; Ping a Cable Modem

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 Test Signal Output To verify the output of a continuous-wave test signal or the output of a PRBS test...

Page 49 - Verify the Ping; Using Cable Interface Debug Commands; Debug Cable ARP Requests

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 command returns a verification from a cable modem that is pinged: Queueing 5 MAC-layer station mainte...

Page 50 - Debug Environmental Monitor Messages; Debug Cable MAC Messages

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 activates debugging of the Cisco uBR7200 series environmental monitor. When thiscom...

Page 51 - Debug Cable Maps; Debug Cable Modems

4-51 Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide 78-5897-01 Chapter 4 Troubleshooting the System Using Cable Interface Debug Commands To deactivate debugging of cable MAC messages, use the following command: CMTS01# no debug cable mac-messages Debug Cable Maps This c...

Page 52 - Debug Cable Modem Ranging Messages

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 activates debugging of ranging messages from cable modems on the HFC network.When thi...

Page 53 - Debug Spectrum Management

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 activates debugging of spectrum management (frequency agility) on the HFC network.When this co...

Page 54 - Debug Upstream Channel Description (UCD) Messages; Managing the Cisco uBR7246 VXR Clock Card; Clear Clock Counters

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 activates debugging of upstream channel descriptor (UCD) messages...

Page 55 - Force Alternate Clock; Set Midplane TDM Clock as Primary Reference; Display Clock Values

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 To select the external timing source when the clock card is in holdover mode, use the cable clock forceglo...

Page 56 - Show Clock Hardware Information and Register Values; Show Clock Diagnostic Information

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 following sample output from the show cable clock command shows both external sources areavailable and the clock card is pro...

Page 58 - Show Clock Frames; Show General Information

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 To display information about the midplane TDM clock reference, use the show frame-clocks privilegedEXEC comman...