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2016: 21 Years CCIE Bootcamps 31 Years IT Trainings and Consulting !

yessssssss, I killed the beast with my first shot!!!!
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'Heinz Ulm"-CCIE 34847

Undocumented or widely unknown IOS and CAT commands

Bert Boerland from Netherlands maintains a raw list of IOS commands, most of them unknown.
Click here to link to his list !

Real output from some undocumented OSPF, EIGRP and other useful IOS commands.

I plan to add more and more of these samples and show them here.

Undocumented CatOS Command for WS-X6608-T1 (or E1)

Wanna know some undocumented CAT commands ?

Wanna know about the secret engineer mode in a Catalyst 5K ?

(I heard it works in a Cat6K also ! And it works with Engine III as well)

Some more undocumented IOS commands:

Some (or most) are IOS-version-dependent of course.
Please don't mail to ask me what they do.

If you do know more about this commands please let me know. Thanks.

set dummy

Selective Packet Drop (spd) is now documented on CCO:

show ip spd

Sample output:
Router# sh ip spd
Current mode: normal.
Queue min/max thresholds: 73/74, Headroom: 100
IP normal queue: 1, priority queue: 0.
SPD special drop mode: none

The following info updates (or adds to) some comments on Bert Boerlands's site:

The "test appletalk" command appeared already in some 11.2.x and 11.3.x

The filenames in cd system:/vfiles are NOT:


Here is a new one: this is closely held secret at CISCO:

There is a quiet recall on some catalyst gear that have the EARL 1 chip NFFC
and a data rate that exceeds 80MBS accross the backplane that causes the ECB
to reset often. Test to see if your catalyst is having this problem: (users
usually report slowness.)

cat5000#> sh banff-reset

will display the number of time it has reset since last power on, a number
of 1 for each ECB is normal

number in the hundreds ar thousands means you need to call CISCO for the
replacement boards.

For those which have tried the "no service password-recovery", a very dangerous
thing to do BTW, click here for some more info.

Undocumented CatOS Command for WS-X6608-T1 (or E1)
(thanks to Martin Gagnon, Canada)

tracy_start [MOD] [PORT]
tracy_close [MOD] [PORT] (to stop the output...)

In fact, you will get the same output as using DickTracy win32 tool



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"I scheduled the 3 weeks Bootcamp at Heinz Ulm with 7 weeks in advance of my lab date. At first I thaught that was a long time, because I was feeling pretty good with my knowledge. But it turned out I was wrong. I wasn't as prepared as I thaught I was. After the 3 weeks spent with Heinz I knew exactly where I was and what I needed to do. The 7 weeks after the bootcamp were gold for me.
I passed the lab on my first attempt. Thanks Heinz for everything.           CCIE 22805 (Romania)"
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