CCBot/2.0 (
for more!
heinz ulm jpg picture on website
2016: 21 Years CCIE Bootcamps 31 Years IT Trainings and Consulting !

A student: "I don't know how anyone can even think of doing the exam without beeing drilled like this"

Random CCIEs
          " Remote attendance" possible now for CCIE Bootcamps saving lots of expenses!!!
(refresh for more)

A happy
'Heinz Ulm"-CCIE 26856

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



CCIE 25215
CCIE 25215
"Hi Professor Heinz, Coming to your boot camp was the dawn of CCIE reality and a big wakeup call for me. Prior to my arrival at your boot camp, I actually deluded myself 'in thinking that I was close to being ready for the LAB' I was so wrong, and so far from the truth. With Professor Heinz, I discovered exactly 'how LIMITED I was in terms of knowledge and CCIE readiness' and exactly what the CCIE standard was and how distant from it I was at the time (i.e. in another galaxy). Thanks to Professor Heinz, I was able to make the transformation from mere 'contender status' to 'actual champion' i.e. passing the CCIE Lab. Warning & Advisory Notice, if you are NOT prepared to sacrifice 'your life' to pass the CCIE Lab, then my advice would be to just forget it, cause believe me, it DEFINITELY has the potential to be FATAL !!!! "          CCIE 25215 (UK) CCIE 25215

free counters Tested with:

mozilla firefox logo ie internet explorer logo safari logo
opera logo flock logo

Valid CSS!

html 5 logo