content="Undocumented IOS commands"> Heinz Ulm 's undocumented IOS stuff (Tuesday, 31/03/26)
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'Heinz Ulm"-CCIE 37813

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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
releases

The filenames in cd system:/vfiles are NOT:
tmstats.ascii
tmstast.binary

CORRECT is:
tmstats_ascii
tmstast_binary



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



Acknowledgements


CCIE 34633
CCIE 34633
"I could summarize the Heinz Bootcamp in one sentence 'If You really think SERIOUSLY about CCIE, just do it!'. But to be more specific it's the best way to refine Your knowledge and gives You all of that little details needed to pass the CCIE exam. Heinz labs are really different from anything on the market, they're unique. Sometimes simply quest but with hidden traps and sometimes difficult one but with reasonable solution, the labs will help You find Your weakest points. That's the best value of the camp. Not to learn You everything from the basics, but to show You where You should improve and verify Your knowledge. This is the most difficult side of preparation to the exam.
And Heinz assures that You're receiving a naked truth about Your preparation status, sometimes it's rough but it's always to help You. And You're receiving tips from the man who knows what CCIE means and how to pass it.
If You think that You're well prepared, then good for You and try with Heinz :) You can be surprised how after the Camp You'll start to think in different way, the exam way. Then there is only one thing left to do :)           CCIE 34633 (Poland)"
"Ich könnte das Heinz Bootcamp in einem Satz zusammenfassen: 'Wenn Sie wirklich ERNSTHAFT über die CCIE nachdenken, machen Sie es einfach!'.
Um aber genauer zu sein, ist es der beste Weg, Ihr Wissen zu vertiefen und Ihnen all die kleinen Details zu vermitteln, die man braucht, um die CCIE-Prüfung zu bestehen.
Die Heinz Labs sind wirklich anders als alles andere auf dem Markt, sie sind einzigartig. Manchmal sind sie einfach, aber mit versteckten Fallen, und manchmal schwierig,
aber mit einer vernünftigen Lösung. Die Labs helfen Ihnen, Ihre schwächsten Punkte zu finden. Das ist der größte Mehrwert des Camps.
Nicht, um Ihnen alles von Grund auf beizubringen, sondern um Ihnen zu zeigen, wo Sie sich verbessern müssen und Ihr Wissen zu überprüfen.
Das ist der schwierigste Teil der Vorbereitung auf die Prüfung. Und Heinz stellt sicher, dass Sie die nackte Wahrheit über Ihren Vorbereitungsstand erhalten, manchmal ist es hart,
aber es dient immer dazu, Ihnen zu helfen. Und Sie erhalten Tipps von einem Mann, der weiß, was CCIE bedeutet und wie man sie besteht.
Wenn Sie denken, dass Sie gut vorbereitet sind, dann ist das gut für Sie und versuchen Sie es mit Heinz :-)
Sie könnten überrascht sein, wie Sie nach dem Camp anfangen, auf andere Art und Weise zu denken - die Prüfungsweise. Dann bleibt nur noch eine Sache zu tun :)
CCIE 34633 (Polen)"
CCIE 34633

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