Configuring Headend Broadband Access Router Features
Troubleshooting Using Cable Flap Lists
Verifying Cable Flap List Aging
To verify that cable flap list aging is set, enter the show cable flap list command:
CMTS01# show cable flap list |
|
|
|
|
|
|
| ||
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 Insertion Time
You can set the cable flap list insertion time. When a cable modem makes an insertion request more frequently than the amount of insertion time defined by this command, the cable modem is placed in the flap list for activity recording. The valid range is from 60 to 86400 seconds.
To set the cable flap list insertion time, use the following command in global configuration mode:
Command | Purpose |
|
|
CMTS01(config)# cable | Specifies the insertion time in seconds. Any cable modem |
| that makes an insertion request more frequently than this |
| period of time is placed in the flap list. |
|
|
Verifying Cable Flap List Insertion Time
To verify cable flap list insertion time, enter the show cable flap list command:
CMTS01# show cable flap list |
|
|
|
|
|
|
| ||
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 Power Adjustment Threshold
You can specify the power adjustment threshold that will cause a flap list event to be recorded. When the power adjustment of a cable modem meets or exceeds the threshold, the cable modem is placed in the flap list. The valid range is from 1 to 10 dBmV.
Note A power adjustment threshold of less than 2 dBmV might cause excessive flap list event recording. We recommend setting this threshold value to 3 dBmV or higher.
To set the power adjustment threshold for flap list events, use the following command in global configuration mode:
Cisco IOS Multiservice Applications Configuration Guide
