Configuring Headend Broadband Access Router Features
Troubleshooting Using Cable Flap Lists
Command | Purpose |
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CMTS01(config)# cable | Specifies the minimum power adjustment that will |
| constitute a flap list event. |
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Verifying Cable Flap List Power Adjustment Threshold
To verify the cable flap list power adjustment threshold, enter the show cable flap list command:
CMTS01# show cable flap list |
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Mac Addr | CableIF | Ins | Hit | Miss | CRC | Flap | Time |
| |
0010.7b6b.5d1d | C3/0 U0 | 0 | 688 | 169 | 0 | 0 | 3 | Nov 5 | 12:28:50 |
0010.7b6b.5e15 | C3/0 U0 | 1 | 707 | 185 | 0 | 0 | 5 | Nov 5 | 12:29:52 |
0010.7b6b.5e27 | C3/0 U0 | 1 | 707 | 198 | 0 | 0 | 5 | Nov 5 | 12:29:55 |
0010.7b6b.5d29 | C3/0 U0 | 1 | 709 | 205 | 0 | 0 | 5 | Nov 5 | 12:29:52 |
0010.7b6b.5e2b | C3/0 U0 | 1 | 710 | 204 | 0 | 0 | 7 | Nov 5 | 12:30:16 |
Setting Cable Flap List Miss Threshold
You can specify the miss threshold for recording a flap list event. A miss is the number of times a cable modem does not acknowledge a
8 percent miss rate is normal for the Cisco cable modem cards. When the number of misses exceeds the threshold, the cable modem is placed in the flap list.
Note A high miss rate can indicate intermittent upstream problems, fiber laser clipping, or
To set the miss threshold for recording a flap list event, use the following command in global configuration mode:
Command | Purpose |
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|
CMTS01(config)# cable | Specifies the number of |
| misses that will result in the cable modems being |
| place in the flap list. |
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|
Verifying Cable Flap List Miss Threshold
To verify the cable flap list miss threshold, enter the show cable flap list command:
CMTS01# show cable flap list |
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Mac Addr | CableIF | Ins | Hit | Miss | CRC | Flap | Time |
| |
0010.7b6b.5d1d | C3/0 U0 | 0 | 688 | 169 | 0 | 0 | 3 | Nov 5 | 12:28:50 |
0010.7b6b.5e15 | C3/0 U0 | 1 | 707 | 185 | 0 | 0 | 5 | Nov 5 | 12:29:52 |
0010.7b6b.5e27 | C3/0 U0 | 1 | 707 | 198 | 0 | 0 | 5 | Nov 5 | 12:29:55 |
0010.7b6b.5d29 | C3/0 U0 | 1 | 709 | 205 | 0 | 0 | 5 | Nov 5 | 12:29:52 |
0010.7b6b.5e2b | C3/0 U0 | 1 | 710 | 204 | 0 | 0 | 7 | Nov 5 | 12:30:16 |
Cisco IOS Multiservice Applications Configuration Guide
