Cisco Broadband Cable Command Reference Guide

show cable flap-list
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Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
Usage Guidelines The sort options operate differently on the different Cisco CMTS routers. On the Cisco uBR7100 series
and Cisco uBR7200 series routers, the sort options apply to all cable interface line cards and merge the
output into a single display.
On the Cisco uBR10012 router, the sort options apply to individual cable interface line cards. For
example, the sort-time option sorts all of the flap entries on the first cable interface line card (c5/0/0),
then the entries on the second card (c5/1/0), and so forth.
Examples The following example shows the output of the show cable flap-list command:
router# show cable flap-list
MAC Address Upstream Ins Hit Miss CRC P-Adj Flap Time
0010.7bb3.fd19 Cable5/0/U1 0 2792 281 0 *45 58 Jul 27 16:54:50
0010.7bb3.fcfc Cable5/0/U1 0 19 4 0 !43 43 Jul 27 16:55:01
0010.7bb3.fcdd Cable5/0/U1 0 19 4 0 *3 3 Jul 27 16:55:01
Note The asterisk (*) in the P-Adj field indicates that a power adjustment has been made for that CM. The
exclamation point (!) indicates that the CM has reached its maximum power transmit level and cannot
increase its power level further.
The following examples show the display of flap-list tables sorted by MAC address and by time:
router# show cable flap-list sort-flap
Mac Addr CableIF Ins Hit Miss CRC P-Adj Flap Time
.1eab.2c0b C6/0 U0 108 318 27 0 0 108 Sep 10 15:26:56
.1eb2.bb07 C6/0 U0 0 293 31 1 1 1 Sep 10 15:15:49
.7b6b.71cd C6/0 U0 1 288 32 0 0 1 Sep 10 15:12:13
.1eb2.bb8f C6/0 U0 1 295 30 0 0 1 Sep 10 15:11:44
Router# show cable flap-list sort-time
Mac Addr CableIF Ins Hit Miss CRC P-Adj Flap Time
00e0.2222.2202 C4/0 U0 464 2069 242 0 421 885 Oct 16 22:47:23
0010.7b6b.57e1 C4/0 U0 0 2475 43 0 1041 1041 Oct 16 22:47:04
Table 2-18 describes the fields displayed by the show flap-list command.
Table 2-18 show cable flap-list Command Field Descriptions
Field Description
Mac Addr The customer account or street address.
CableIF The physical port, including the upstream port.
Ins The number of times the CM comes up and inserts itself into the
network. It can indicate intermittent downstream sync loss or
DHCP or modem registration problems.
Hit The number of times the CM responds to MAC layer keepalive
messages. (The minimum hit rate is once per 30 seconds. It can
indicate intermittent upstream, laser clipping, or common-path
distortion.
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