I have to say that I was surprised when I found a show command that will
crash a router in the first releases of 12.0.
The first time I played in a customers 8500 Series running 12.0 I did a
bunch if show commands until I found out Cisco added "show diag ? ". I
decided it would be interesting to try every option possible behind it and
see what was shown. Then, the router completely quit responding. Of course
this happened around 2 AM 800 miles away from my building. So I contacted
the customer to go in and reboot the box. The customer said that all the
lights on the entire chassis were bright red. After the reboot the box
recovered saying possible write erase preformed and of course went right to
the setup dialog. The config was not in the router anyway and the customer
failed to back it up. So of course I spent the next three hours helping the
customer figure out how to restore the configuration by tracing cable and
looking at IP addresses assigned on each machine.
Now I can't tell my new employees that show commands will never cause a
problem...But if it does you blame it on that Cisco IOS.
James Hilving
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Ben Lovegrove
Sent: Tuesday, August 08, 2000 2:20 AM
To: [EMAIL PROTECTED]
Subject: "You can call yourself and internetworking engineer when . . .
."
(tongue firmly in cheek)
I have this theory that you can call yourself and internetworking
engineer when . . . .
1. You have run a debug command on a customer router while
investigating a performance problem, or perhaps a security issue, and
you have caused the CPU to exceed 100% and the router has hung/crashed.
2. You have edited an ACL remotely and reapplied it only to find you
have blocked all traffic including telnet from your desk and you are
now locked out.
3. In both of the above scenarios you have made up some story for the
Help Desk/1st Line Support and asked them to get the customer to reboot
the router, claiming that "a reboot may help the performance problem .
. blah . . blah"
4. In each of points 1 & 2 the customer in question is a major account
that has threatened legal action against your company for failing to
maintain SLAs, or to close the account altogether.
Does this sound familiar to anyone? Have you every felt that cold
feeling in the pit of your stomach when you entered a command and the
screen froze? Did you blame hardware/software/customer/gremlins i.e.
anybody and anything but not yourself?
;-)
Ben
=====
Ben Lovegrove, CCNP
Redspan Solutions Ltd
http://www.redspan.com
Cisco: Products, Training, Jobs, Study Guides, Resources.
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