
How to Monitor and Troubleshoot Using Flap Lists
Displaying the Flap List Using the show cable flap-list Command
To display the current contents of the flap list, use the show cable flap-list command in privileged EXEC
mode. This command has the following syntax:
•
show cable flap-list
—
Displays the complete flap list.
•
show cable flap-list sort-interface
—
Displays the complete flap list sorted by cable interface.
•
show cable flap-list cable interface upstream port
—
Displays the flap list for a specific cable interface,
or for a specific upstream port on that cable interface.
To change the way the output is sorted, add one of the following optional keywords:
•
sort-flap
—
Sorts the output by the number of times that the cable modem has flapped.
•
sort-time
—
Sorts the output by the most recent time that the cable modem flapped.
The following example shows typical output of the
show cable flap-list
command.
Router#
show cable flap-list
Mac Addr
CableIF Ins
Hit
Miss
CRC
P-Adj
Flap
Time
0010.9500.461f C1/0 U1 56
18857
887
0
1
116 Jun 1
14:09:12
0010.9500.446e C1/0 U1 38
18686
2935
0
1
80 Jun 2
19:03:57
0010.9500.38ec C1/0 U2 63
18932
1040
0
8
138 Jun 2
23:50:53
0010.9500.4474 C1/0 U2 65
18913
1053
0
3
137 Jun 2
09:30:09
0010.9500.4672 C1/0 U2 56
18990
2327
0
6
124 Jun 2
10:44:14
0010.9500.38f0 C1/0 U2 50
18964
2083
0
5
111 Jun 2
20:46:56
0010.9500.e8cb C1/0 U2
0
6537
183
0
1
5 Jun 2
22:35:48
0010.9500.38f6 C1/0 U3 50
19016
2511
0
2
104 Jun 2
07:46:31
0010.9500.4671 C1/0 U3 43
18755
3212
1
1
89 Jun 1
19:36:20
0010.9500.38eb C1/0 U0 57
36133
1608
0
6
126 Jun 2
20:04:58
0010.9500.3ce2 C1/0 U0 44
35315
1907
0
4
99 Jun 2
16:42:47
0010.9500.e8d0 C1/0 U2
0
13213
246
0
1
5 Jun 3
04:15:30
0010.9500.4674 C1/0 U2 56
36037
2379
0
4
121 Jun 3
00:34:12
0010.9500.4677 C1/0 U2 40
35781
2381
0
4
91 Jun 2
12:14:38
0010.9500.4614 C1/0 U2 40
21810
2362
0
502
586 Jun 2
21:43:02
0010.9500.3be9 C1/0 U2 63
22862
969
0
0
128 Jun 1
14:09:03
0010.9500.4609 C1/0 U2 55
22723
2127
0
0
112 Jun 1
14:08:02
0010.9500.3cb8 C1/0 U2 49
22607
1378
0
0
102 Jun 1
14:08:58
0010.9500.460d C1/0 U3 46
22477
2967
0
2
96 Jun 2
17:03:48
0010.9500.3cba C1/0 U3 39
22343
3058
0
0
81 Jun 1
14:13:16
0010.9500.3cb4 C1/0 U3 38
22238
2936
0
0
79 Jun 1
14:09:26
0010.9500.4612 C1/0 U3 38
22306
2928
0
0
79 Jun 1
14:09:29
Router#
Displaying the Flap List Using the show cable modem flap Command
To display the contents of the flap list for a specific cable modem, use the
show cable modem flap
command
in privileged EXEC mode. This command has the following syntax:
•
show cable modem
[
ip-address
|
mac-address
]
flap
—
Displays the flap list for a specific cable modem,
as identified by its IP address or MAC address.
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Flap List Troubleshooting
How to Monitor and Troubleshoot Using Flap Lists