Cisco Systems uBR7200 Series manual Display the Flap List, UBR7200#show cable flap

Page 37

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

Time

 

0010.9500.461f C3/0 U1

56

18857

887

0

1

116

Jun 1

14:09:12

0010.9500.446e C3/0 U1

38

18686

2935

0

1

80

Jun 2

19:03:57

0010.9500.38ec C3/0 U2

63

18932

1040

0

8

138

Jun 2

23:50:53

0010.9500.4474 C3/0 U2

65

18913

1053

0

3

137

Jun 2

09:30:09

0010.9500.4672 C3/0 U2

56

18990

2327

0

6

124

Jun 2

10:44:14

0010.9500.38f0 C3/0 U2

50

18964

2083

0

5

111

Jun 2

20:46:56

0010.9500.e8cb C3/0 U2

0

6537

183

0

1

5

Jun 2

22:35:48

0010.9500.38f6 C3/0 U3

50

19016

2511

0

2

104

Jun 2

07:46:31

0010.9500.4671 C3/0 U4

43

18755

3212

1

1

89

Jun 1

19:36:20

0010.9500.38eb C4/0 U0

57

36133

1608

0

6

126

Jun 2

20:04:58

0010.9500.3ce2 C4/0 U0

44

35315

1907

0

4

99

Jun 2

16:42:47

0010.9500.e8d0 C4/0 U2

0

13213

246

0

1

5

Jun 3

04:15:30

0010.9500.4674 C4/0 U4

56

36037

2379

0

4

121

Jun 3

00:34:12

0010.9500.4677 C4/0 U4

40

35781

2381

0

4

91

Jun 2

12:14:38

0010.9500.4614 C5/0 U5

40

21810

2362

0

502

586

Jun 2

21:43:02

0010.9500.3be9 C6/0 U5

63

22862

969

0

0

128

Jun 1

14:09:03

0010.9500.4609 C6/0 U5

55

22723

2127

0

0

112

Jun 1

14:08:02

0010.9500.3cb8 C6/0 U5

49

22607

1378

0

0

102

Jun 1

14:08:58

0010.9500.460d C6/0 U5

46

22477

2967

0

2

96

Jun 2

17:03:48

0010.9500.3cba C6/0 U5

39

22343

3058

0

0

81

Jun 1

14:13:16

0010.9500.3cb4 C6/0 U5

38

22238

2936

0

0

79

Jun 1

14:09:26

0010.9500.4612 C6/0 U5

38

22306

2928

0

0

79

Jun 1

14:09:29

The command line with an arrow next to it reveals a cable modem that is continuously flapping. A high flap rate indicates that the cable modem is power adjusting frequently. This can indicate a problem with an amplifier. The number reveals the number of times the CMTS instructed the cable modem to adjust the transmit power more than 3 dB.

Cable modems are automatically added to the flap list when any of the following conditions are detected:

•When the cable modem re-registers more frequently than the user-specified insertion time.

•When intermittent keepalive messages are detected between the CMTS and the cable modem.

•When the cable modem’s upstream transmit power is adjusted beyond the user-specified power threshold.

Display the Flap List

The flap list can be queried either using the standard Simple Network Management (SNMP) API or the CLI. Using any third party SNMP Management Information Base (MIB) browser, you can query the ccsFlapTable in the CISCO-CABLE-SPECTRUM-MIB, a proprietary extension to the DOCSIS MIBs.

Using the show cable flap list command, the flap list statistics are accessed. A sample appears below. Each of the columns in the display are described in Table 4-20:

MAC ID___ CableIF

 

Ins _Hit__

Miss

CRC

P-Adj

Flap ___Time____

 

 

 

 

 

 

 

 

 

 

0010.7b6b.60ad C3/0 U0

0

14386

1390

1

38

41

Nov 24

21:34:24

0010.7b6b.65a3

C3/0

U0

0

14503

1264

1

33

37

Nov

24

21:28:09

0010.7b6b.6b9d

C3/0

U0

0

14060

1726

3

40

43

Nov

24

21:18:36

Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide

 

78-5897-01

4-37

 

 

 

Page 36 Page 38
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Page 36 Page 38
Contents Troubleshooting the System Managing Cable Modems on the HFC Network Configure Sync Message IntervalVerify Cable Modem Authentication Activate Cable Modem AuthenticationActivate Cable Modem Upstream Address Verification Verify Sync Message IntervalCMTS01config-if#no cable source-verify CMTS01config-if#cable source-verify dhcpVerify Cable Modem Upstream Address Verification CMTS01config-if#cable insertion-interval max CMTS01config-if#no cable insertion-intervalCMTS01config-if#cable insertion-interval AutomaticConfigure Per Modem Filters Configure access lists to be specified on a Clear Cable Modem Reset Configure Cable Modem Registration TimeoutCMTS01config-if#cable registration-timeout n Clear Cable Modem Counters Verify Clear Cable Modem ResetConfigure Downstream Rate Limiting and Shaping Configure Traffic ShapingConfigure Upstream Rate Limiting and Shaping Verify Clear Cable Modem CountersBlind Strategies and Time Scheduled Combined CMTS01config-if#nocable upstream n1 rate-limitToken-bucket CMTS01# show interface c3/0 sid 1 countersGuided Frequency Hop Field Description Sample outputShow Cable Hop Command Spectrum Management Debug and Test Commands14 Show Cable Hop Parameter Descriptions Polling Cable Modems Debug and Test CommandsConfigure Remote Modem Monitoring Enable SnmpAllows you to configure access Verifying Remote Query InformationGeneral Show Commands Understanding Show Command ResponsesMonitoring and Maintaining Remote Querying Show Cable Modem See the sample command output below Page SID Cable modem cable 3/0 upstream 0 unregistered Show Cable Modem MaintenanceCable modem cable 3/0 upstream 0 offline Show Interface Cable UBR7200#show cable modem maintenanceMTU CRC Router# show interface cable 6/0 downstream Field Description18 Show Interface Cable Upstream Command Field Descriptions ATP Enhanced Show Interface Upstream Output Cable slot 3, port Show Interface Cable SIDShow Router# show interface c3/0 sid counters verboseRouter# show interface c3/0 sid connectivity ConnectivityRouter# show interface c3/0 sid 1 counters Show Cable QoS Profile Troubleshooting Using Cable Flap ListsUBR7200#show cable qos profile Page Page UBR7200#show cable flap Display the Flap ListMAC ID Statistic DescriptionPlant troubleshooting. The CRC counter indicates Troubleshoot with the Flap List Set Cable Flap List Insertion Time Set Cable Flap List AgingVerify Cable Flap List Aging Verify Cable Flap List Insertion TimeVerify Cable Flap List Power Adjustment Threshold Set Cable Flap List Power Adjustment ThresholdSet Cable Flap List Miss Threshold Clear Cable Flap List Set Cable Flap List SizeVerify Cable Flap List Miss Threshold Verify Cable Flap List SizeCustomize Other Flap List Values and Related Commands Performing Amplitude Averaging Enable or Disable Power AdjustmentSyntax Valid Values Set Frequency Threshold to Affect Power AdjustmentConfigure Unmodulated Test Signals Setting Downstream Test SignalsStep Command Purpose Verify Test Signal Output Configure Prbs Test SignalsStep Command Pinging Unresponsive Cable ModemsVerify the Ping Using Cable Interface Debug CommandsDebug Cable ARP Requests Debug Environmental Monitor Messages Debug Cable MAC Protocol ErrorsActivate Debug of Baseline Privacy Debug Baseline Privacy ActivityDebug Cable Modems Debug Cable MapsDebug Cable PHY Messages Activate QoS DebugDebug Cable Modem Ranging Messages Debug Cable Modem Reset MessagesDebug Upstream Messages Debug Cable Modem Registration RequestsDebug Channel Allocations Debug Spectrum ManagementDebug Cmts Transmissions Debug Upstream Channel Change UCC MessagesDebug Upstream Channel Description UCD Messages Managing the Cisco uBR7246 VXR Clock CardClear Clock Counters Show diag Show frame-clocks Show tech support Show versionSet Midplane TDM Clock as Primary Reference Force Alternate ClockDisplay Clock Values Cable clock force primary secondary no cable clock forceShow Clock Hardware Information and Register Values Show Clock Diagnostic InformationRouter# show cable clock Show controllers clock-reference33 describes the fields shown in the show diag display Show General Information Show Clock FramesRouter# show frame-clocks
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