Troubleshooting guide

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 7 Troubleshooting the CMTS
Troubleshooting the Cisco uBR7246VXR
Verifying Cable Flap List Miss Threshold
To verify the cable flap list miss threshold, enter the show cable flap list command and note the values
in the Miss column:
show cable flap list
Mac Addr CableIF Ins Hit Miss CRC P-Adj 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 Size
You can specify the maximum number of cable modems that can be listed in the cable flap list tables.
The valid range is from 1 to 8192 cable modems. The default is 8192 cable modems.
To specify the maximum number of cable modems that can be listed in the flap list, use the cable
flap-list size command in global configuration mode. To specify the default flap-list table size, use the
no form of this command.
Command:
[no] cable flap-list size number
Syntax Description
number
Specifies the maximum number of cable modems that will report flap performance to the flap-list
table. Valid values are from 1 to 8192. The default value is 8192.
The following example shows how to limit the flap-list table size to no more than 200 modems:
router(config)# cable flap-list size 200
Verifying Cable Flap List Size
To verify the cable flap list size, enter the show cable flap list command, and note the number of modems
in the list:
show cable flap list
Mac Addr CableIF Ins Hit Miss CRC P-Adj 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
Clearing Cable Flap List
To remove a single cable modem from the flap list or to remove all cable modems from the flap list, use
the clear cable flap-list command in privileged EXEC mode.
Command:
clear cable flap-list [mac-addr | all]