Cisco Systems uBR7200 Series Instrukcja Naprawy Pobierz pdf (Strona 37)

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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 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

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