From: Ryan (ryan95842@gmail.com)
Date: Wed Oct 25 2006 - 17:23:54 ART
When doing a practice lab, (or the real lab), regarding interpretation of
the objective, when should you use/not use the passive interface?
For example, I was doing one practice lab (forget which one) where it said
to add all the networks in the rip domain on the diagram to rip, fairly
vague but enough. The diagram shows a nice dashed circle encompassing just
the interfaces. I think there was a specific mention to not put one
interface into the rip protocol on a later objective.
Regardless, we have a generalized requirement to add interfaces to RIP and
to not add a specific interface to RIP on a specific router.
So my interpretation would be to ONLY add the networks that fall with in the
circle/drawing, which would mean adding the passive interfaces on the other
interfaces NOT in the circle, and also to specifically add the passive
interface for the later mentioned objective item.
In the solution, at this step there were no passive interfaces applied to
the general objective, but later on the lab when we got to redistribution,
several interfaces had the passive interface applied.
So my question is, when an objective is general like this, should I keep my
solution general as well? or is more precision better? I personally like
precision, but I don't want to shoot myself in the foot either down the
road...
-Ryan
On 10/21/06, Scott Morris <swm@emanon.com> wrote:
>
> Or perhaps a nice "best practice" thing to get in the habit of is using
> "passive default" and then you must deliberately choose which interfaces
> have peers to use the "no passive ..." on. I've always found this helps
> me
> keep things clean without wasting MY OWN cpu cycles. :)
>
> Just a thought....
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
> #153, CISSP, et al.
> CCSI/JNCI-M/JNCI-J
> IPExpert VP - Curriculum Development
> IPExpert Sr. Technical Instructor
> smorris@ipexpert.com
> http://www.ipexpert.com
>
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Brian Dennis
> Sent: Saturday, October 21, 2006 12:50 PM
> To: Laurent Dupraz; ccielab@groupstudy.com
> Subject: RE: Passive-interface for loopback0
>
> If you are referring to the CCIE lab then there aren't any rules. If they
> ask you to make them passive then do. If they don't ask then don't make
> them passive.
>
> In the real world if you don't want to waste CPU cycles you can make any
> interface that will not have a "neighbor" passive (i.e loopback).
>
> HTH,
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Laurent Dupraz
> Sent: Saturday, October 21, 2006 12:58 AM
> To: ccielab@groupstudy.com
> Subject: Passive-interface for loopback0
>
> Dear all,
>
>
>
> what are the rules concerning loopback 0 passive-interface:
>
>
>
>
>
> for example:
>
>
>
> OSPF:
>
>
>
> int loopback0
>
> ip add x.x.x.x x.x.x.x
>
> !
>
> router ospf 1
>
> net ...
>
> passive-interface loopback0
>
> ! ================================= I think not needed
>
>
>
>
>
> RIP
>
> int loopback0
>
> ip add x.x.x.x x.x.x.x
>
> !
>
> router RIP
>
> net ...
>
> passive-interface loopback0
>
> ! ================================= I think needed
>
>
>
>
>
> EIGRP
>
>
>
> int loopback0
>
> ip add x.x.x.x x.x.x.x
>
> !
>
> router EIGRP 1
>
> net ...
>
> passive-interface loopback0
>
> ! ================================= I think needed
>
>
>
> Thanks for your support
>
> Laurent
>
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