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CHAPTER

4-1

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

78-5897-01

Troubleshooting the System

This chapter contains troubleshooting information. The chapter includes the following sections:

• Using a Cable Modem at the Headend to Verify Downstream Signals

• Managing Cable Modems on the HFC Network

• Polling Cable Modems

• Understanding Show Command Responses

• Troubleshooting Using Cable Flap Lists

• Performing Amplitude Averaging

• Setting Downstream Test Signals

• Pinging Unresponsive Cable Modems

• Using Cable Interface Debug Commands

• Managing the Cisco uBR7246 VXR Clock Card

Using a Cable Modem at the Headend to Verify

Downstream Signals

You can use a Cisco uBR924 cable access router to verify the downstream signal originating from a

Cisco uBR7200 series universal broadband router. Be sure you configure the Cisco uBR924 according

to DOCSIS cable modem practises. To verify the downstream signal from a

Cisco uBR7200 series universal router using a Cisco uBR924, follow the procedure below:

Step 1 After the Cisco uBR924 is operational and you have an input signal between 0 and +5 dBmV, enter the

show controller c0 tuner command.

Step 2 Scan the output for the value corresponding to the signal to noise (SNR) estimate variable. If this value

is at least 35 dB, then you have an optimized signal. If the value is less than 34 dB, adjust the

upconverter at the cable headend.

1 2 3 4 5 6 ... 57 58

Inhaltsverzeichnis

Seite 1 - Troubleshooting the System

CHAPTER4-1Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-014Troubleshooting the SystemThis chapter contains troub

Seite 2

4-10Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

Seite 3 - Verify Sync Message Interval

4-11Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

Seite 4 - Range, and Data Backoffs)

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Seite 6 - Configure Per Modem Filters

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Seite 7 - <acl>

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Seite 8 - Clear Cable Modem Reset

4-16Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemPolling Cable ModemsSamp

Seite 9 - Clear Cable Modem Counters

4-17Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemPolling Cable ModemsEnab

Seite 10 - Configure Traffic Shaping

4-18Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 11 - Modem Card)

4-19Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 12 - Guided Frequency Hop

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Seite 13

4-20Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 14 - Show Cable Hop Command

4-21Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

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4-22Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 16 - Polling Cable Modems

4-23Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 17 - Enable SNMP

4-24Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 18 - General Show Commands

4-25Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 19 - Show Cable Modem

4-26Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

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4-28Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

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4-29Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

Seite 23 - Show Cable Modem Maintenance

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Seite 24 - Show Interface Cable

4-30Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

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4-32Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUnderstanding Show Comma

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4-34Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-36Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

Seite 31 - Show Interface Cable SID

4-37Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-38Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-39Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

Seite 34 - Show Cable QoS Profile

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4-40Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-41Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

Seite 37 - Display the Flap List

4-42Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-43Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-44Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemTroubleshooting Using Ca

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4-45Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemPerforming Amplitude Ave

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4-46Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemPerforming Amplitude Ave

Seite 42

4-47Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemSetting Downstream Test

Seite 43 - Clear Cable Flap List

4-48Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemPinging Unresponsive Cab

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4-49Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUsing Cable Interface De

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4-50Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUsing Cable Interface De

Seite 47

4-51Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUsing Cable Interface De

Seite 48 - Ping a Cable Modem

4-52Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUsing Cable Interface De

Seite 49 - Debug Cable ARP Requests

4-53Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemUsing Cable Interface De

Seite 50 - Debug Cable MAC Messages

4-54Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging the Cisco uBR72

Seite 51 - Activate QoS Debug

4-55Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging the Cisco uBR72

Seite 52 - Debug Upstream Messages

4-56Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging the Cisco uBR72

Seite 53 - Debug CMTS Transmissions

4-57Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging the Cisco uBR72

Seite 54 - Clear Clock Counters

4-58Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging the Cisco uBR72

Seite 55 - Display Clock Values

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Seite 58 - Show General Information

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