From: Joseph Brunner (joe@affirmedsystems.com)
Date: Sat Sep 01 2007 - 06:52:47 ART
Things that can go wrong with the real gear, and only with the real gear...
Will burn your time bad in the real lab to try and fix (loops, bad
interfaces, two routers talking together through 3 switches over a
dot1q-tunnel, etc)
I'm not saying you can't learn the technologies on the dynagen, but I'm
saying spend some practices sessions on a full 10 piece rack.
That's all
Happy Dynagening...
-Joe
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Scott Vermillion
Sent: Saturday, September 01, 2007 12:38 AM
To: Cisco certification
Subject: RE: Dynagen folks...
I am a true Dynamips/Dynagen believer and have built my lab prep "rack"
around it/them. Please explain, Joe, how I will fail the CCIE lab
because of it ("nothing else can prepare you for the real thing")? What
is it about that "feel" that makes the difference (can you go "feel" the
routers during the practical? Can you "feel" the routers in that remote
rack?)?
This has the potential to become the next "CCIE vs. college degree"
topic, me thinks. It's probably not a very good use of bandwidth, come
to think of it LOL, but I can't resist asking you to elaborate on these
seemingly unfounded generalizations. I would prefer that you answer with
"I have hardware routers and I also run Dynamips/Dynagen on a machine of
sufficient horsepower, and here are the things I can do on the former
that I can't do on the latter *that matter in the lab* (i.e. don't tell
me about toggling the power switch...yawn...you can't do that in the lab
anyway by all accounts I've ever heard).
I'll start, going the opposite direction:
I run Dynamips/Dynagen on a machine of sufficient horsepower, and I can
directly capture traffic from a router interface into a .cap file and
scrutinize every one and zero using open source WireShark. When I want
to do that w/ physical routers, I have to use Ethernet (no serial) and
set up a span port on a switch or put a hub in between the two routers,
with a machine running WireShark hanging off of the hub (and I'm
obviously in HDX at this point, which means the test environment is
different than the non-test environment). Otherwise, I'm limited to only
debug. I, of course, acknowledge that you're limited to only debug in
the lab, but in your preparation for the lab, it's powerful to have such
a tool at your disposal so that you can truly understand what's going on
under the hood when you see certain debug output.
BTW, I'm told Juniper has this capability to write .cap files on physical
routers, but I cannot personall y verify. I have never heard of such a
capability on Cisco routers, but I'd love to be proven wrong.
There are more, of course, but I've already stated many of them in other
recent threads and posts...
-------- Original Message --------
Subject: Dynagen folks...
From: "Joseph Brunner" <joe@affirmedsystems.com>
Date: Fri, August 31, 2007 9:53 pm
To: "'Cisco certification'" <ccielab@groupstudy.com>
Nothing feels as good as the real thing. And else nothing can prepare
you
for the real thing.
(Remember if you only have had sex with a condom, your still a
virgin, LOL)
Check out the Brian's racks!
http://www.affirmedsystems.com/photos/IERACKS.JPG
Rack12R6#sh vers
Cisco IOS Software, 2800 Software (C2800NM-ADVENTERPRISEK9-M),
Version
12.4(13a), RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Tue 06-Mar-07 17:01 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
Rack12R6 uptime is 6 hours, 4 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-adventerprisek9-mz.124-13a.bin"
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Cisco 2811 (revision 53.50) with 196608K/65536K bytes of memory.
Processor board ID FTX1101A1Z0
2 FastEthernet interfaces
1 Serial(sync/async) interface
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
253160K bytes of USB Flash usbflash1 (Read/Write)
62720K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2142 (will be 0x2102 at next reload)
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