Re: Lab - Best Method to Verfiy Reachibility

From: Carlos G Mendioroz (tron@huapi.ba.ar)
Date: Fri Dec 26 2008 - 10:46:19 ARST

I thought I had already published those, but I could not find them :(
I do not have handy a copy of the scripts I used, but the idea was to
use a couple of tricks:

-use a list of networks your lab has. You can build it in notepad
as you learn the topology. I used the x.x.x.x/nn format for ease of
keeping, which forced me to create a small function to convert to
mask format.
-use tcl capability to run "show ip route <net> <mask>" to test
if every net is in the router. That testing is done by parsing the
output and only print a message if the network is not there.
-use rcmd to be able to do that in every router, but controlled by
one.

Final output was like:

190.0.3.4/24 not there at R3
...

Also, as I did say a couple of times, "full tcl" is mostly for
programmers. You can benefit from tcl by using recipes, but there's a
lot of potential for good and bad :)
My current view is that this may not be such a good idea for actual lab
time, but is a great way of practicing and learning. Lab, for me,
was mainly a trigger to learn things. It's amazing how many things I
thought I knew before I discovered them :) How many more to come ?
And you learn far more by investigating how to do things than by
receiving a recipe on how to do them.

-Carlos

Andy Hogard @ 26/12/2008 9:50 -0200 dixit:
> Hey Carlos,
>
> It would be nice if you could elaborate, and even better if you can give
> us an ex ..using small three router topolgy.
>
> Regards,
> Andy.
>
> On Fri, Dec 26, 2008 at 4:13 PM, Carlos G Mendioroz <tron@huapi.ba.ar
> <mailto:tron@huapi.ba.ar>> wrote:
>
> It depends on you too.
> Ping scripts will tell you something may be wrong.
> I used a tcl script to test route presence on every router, which was
> more complicated to prepare but gave more visibility to what was wrong.
> I just knew how to do it in case I run into some trouble
> (those pesty redistributions which route instabilities).
> debug ip routing was a nice complement.
>
> -Carlos
>
> ramiz sardar @ 24/12/2008 11:09 -0200 dixit:
> > Hi Experts,
> >
> > After completion of IGP section, what is the best method to verify
> > reachibility? Most of people use ping tclscript so if this is the
> > recomendation then should we ping each and every interface or some
> of them? I
> > think if we ping loopback interfaces of all devices and interfaces
> of that are
> > connected with BBs, this is fine.
> >
> > kindly add your comments. Best Regards,Rameez
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> --
> Carlos G Mendioroz <tron@huapi.ba.ar <mailto:tron@huapi.ba.ar>>
> LW7 EQI Argentina
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-- 
Carlos G Mendioroz  <tron@huapi.ba.ar>  LW7 EQI  Argentina

Blogs and organic groups at http://www.ccie.net

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