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Cisco Systems uBR7200 Series Průvodce řešením problémů

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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. 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.
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Shrnutí obsahu

Strany 1 - Troubleshooting the System

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

Strany 2

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

Strany 3 - Verify Sync Message Interval

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

Strany 4 - Range, and Data Backoffs)

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Strany 5

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Strany 6 - Configure Per Modem Filters

4-14Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

Strany 7 - <acl>

4-15Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

Strany 8 - Clear Cable Modem Reset

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

Strany 9 - Clear Cable Modem Counters

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

Strany 10 - Configure Traffic Shaping

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

Strany 11 - Modem Card)

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

Strany 12 - Guided Frequency Hop

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Strany 13

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Strany 14 - Show Cable Hop Command

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Strany 15

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

Strany 16 - Polling Cable Modems

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

Strany 17 - Enable SNMP

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

Strany 18 - General Show Commands

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

Strany 19 - Show Cable Modem

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Strany 20

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Strany 21 - 78-5897-01

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Strany 22

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

Strany 23 - Show Cable Modem Maintenance

4-3Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

Strany 24 - Show Interface Cable

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

Strany 25

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Strany 28

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Strany 29

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Strany 30

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

Strany 31 - Show Interface Cable SID

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

Strany 32

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

Strany 33

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

Strany 34 - Show Cable QoS Profile

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

Strany 35

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Strany 36

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

Strany 37 - Display the Flap List

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

Strany 38

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

Strany 39

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Strany 40

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

Strany 41

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

Strany 42

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

Strany 43 - Clear Cable Flap List

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

Strany 44

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

Strany 45

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Strany 46

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

Strany 47

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

Strany 48 - Ping a Cable Modem

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

Strany 49 - Debug Cable ARP Requests

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

Strany 50 - Debug Cable MAC Messages

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

Strany 51 - Activate QoS Debug

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

Strany 52 - Debug Upstream Messages

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

Strany 53 - Debug CMTS Transmissions

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

Strany 54 - Clear Clock Counters

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

Strany 55 - Display Clock Values

4-6Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

Strany 56

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Strany 57

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Strany 58 - Show General Information

4-9Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide78-5897-01Chapter 4 Troubleshooting the SystemManaging Cable Modems on

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