Installation guide

5-39
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 5 Troubleshooting the System
Troubleshooting Cable Flap Lists
Setting Cable Flap List Insertion Time
You can set the cable flap list insertion time. When a cable interface makes an insertion request more
frequently than the amount of insertion time defined by this command, the cable interface 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.
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 P-Adj Flap Time
0010.7b6b.5d1d C1/0 U0 0 688 169 0 0 3 Nov 5 12:28:50
0010.7b6b.5e15 C1/0 U0 1 707 185 0 0 5 Nov 5 12:29:52
0010.7b6b.5e27 C1/0 U0 1 707 198 0 0 5 Nov 5 12:29:55
0010.7b6b.5d29 C1/0 U0 1 709 205 0 0 5 Nov 5 12:29:52
0010.7b6b.5e2b C1/0 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 interface meets or exceeds the threshold, the cable interface 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. Cisco
recommends 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.
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
Mac Addr CableIF Ins Hit Miss CRC P-Adj Flap Time
0010.7b6b.5d1d C1/0 U0 0 688 169 0 0 3 Nov 5 12:28:50
0010.7b6b.5e15 C1/0 U0 1 707 185 0 0 5 Nov 5 12:29:52
0010.7b6b.5e27 C1/0 U0 1 707 198 0 0 5 Nov 5 12:29:55
0010.7b6b.5d29 C1/0 U0 1 709 205 0 0 5 Nov 5 12:29:52
0010.7b6b.5e2b C1/0 U0 1 710 204 0 0 7 Nov 5 12:30:16
Command Purpose
CMTS01(config)# cable flap-list
insertion-time
seconds
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.
Command Purpose
CMTS01(config)# cable flap-list
power-adjust threshold
dbmv
Specifies the minimum power adjustment that will constitute
a flap-list event.