Re: How would you solve this task?

Good question. My view with EIGRP is that there is absolutely no reason to
NOT disable auto summarization unless you have a really really good reason
(i.e. the lab says so). Disabling auto-summary should be a given every time
you type "router eigrp". With that being said, I think the solutions guide
you have is wrong. Disabling auto-summarization in EIGRP does not disable
summary routes to null0, at least in the recent experiments I have done.

I think your solution of changing the AD on the summary to 255 is a fine
solution and it meets the requirements of the task.

Check out this blog:
http://astorinonetworks.com/2011/07/20/summary-routes-to-null0-the-protocols-that-love-them/

On Tue, Aug 9, 2011 at 12:46 PM, Daniel Dib <daniel.dib_at_reaper.nu> wrote:

> On ti, aug 09, 2011 at 17:31:46, Joe Astorino wrote:
> > Cc: ccielab_at_groupstudy.com
> > Subject: Re: How would you solve this task?
> >
> > Lots of great advice in this thread, but here is my two cents. I like
> > your solution better. It is more specific and in my opinion more
> > technically correct. However, that is not the point of my post. The
> > point is, this is a task that is a great example of when to clarify
> > with the proctor. Make sure you choose your words carefully. I might
> > have said something like "This task wants me to log successful and
> > unsuccessful telnet attempts. I believe there are multiple ways to
> > define a telnet attempt. For example, I could simply log all packets
> > destined for the well known telnet port of TCP 23, or I could be very
> > specific and log login success/failures using the login feature set.
> > Could you clarify which would be more acceptable, or does it matter?"
> >
> > HTH
> >
>
> Hi Joe,
>
> Great advice. What would you recommend for the task below:
>
> 1.10 TROUBLE TICKET 10
> R1's routing table has a summary pointing to Null0. Modify R1 so that there
> are no routes to Null0.
>
> SG solution: Turn off auto-summary under EIGRP.
>
> My solution: Announce summary with AD of 255 on Ethernet interface which
> meant it is not installed locally with the ip summary address eigrp
> command.
> If the task had said something like make sure that classless routing is
> used
> or anything like that I would definitely have removed auto-summary. Maybe
> it
> is a safe assumption that auto-summary should not be used unless a task
> tells you to, guess that is one more for the proctor.
>
> Also one of those tasks that could easily get misinterpreted.
>
> Once again, thanks for your input.
>
>
> /Daniel
>
>

-- 
Regards,
Joe Astorino
CCIE #24347
Blog: http://astorinonetworks.com
"He not busy being born is busy dying" - Dylan
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