From: Scott Morris (smorris@ipexpert.com)
Date: Tue Oct 02 2007 - 23:42:56 ART
It would just waste whatever time it took you to type in the extra commands.
But if you are used to thinking/configuring that way, then it would likely
be less time than for you to re-think it all!
Scott
-----Original Message-----
From: Mohamed M Moustafa [mailto:mmma@gawab.com]
Sent: Tuesday, October 02, 2007 4:47 PM
To: smorris@ipexpert.com
Cc: 'Brian Dennis'; ccielab@groupstudy.com
Subject: RE: Mutual redistribution and loop prevention
Scott,
Thank you for your valuable advice, the reason behind my question was that i
was already used to tag routes while redistributing as you advised, but my
concern was if this was going to waste me some points in cases that i was
requested to use AD, but i understood your point that each
scenario/lab/network/experience is a little different, and i'll do my best
to solve this issue with the optimum method, and lets pray that i don't have
such an expensive lunch :)
Again thank you very much for your valuable efforts.
BR,
Mohammed Mahmoud.
Scott Morris <smorris@ipexpert.com> wrote on 2 Oct 2007, 09:54 PM:
Subject: RE: Mutual redistribution and loop prevention
>I don't think there's any simple answer as each
>scenario/lab/network/experience is a little different.
>
>Most of the time, I will tag routes when I redistribute. Whether I
>really need to or not is irrelevant. I can monitor where a route came
>from at any time, and IF I have to filter anything, it's less work to
>implement it 'cause the tag is already there.
>
>I also will typically tag with the tag number equal to the AD of the
>originating protocol. Again, just simple things to bring consistency
>into play.
>
>But watch what your lab tells you. Watch the results of "debug ip routing"
>and determine whether you need to care or not! Simple redistribution
>doesn't need to be that fancy. I always encourage people to enable
>"debug ip routing" on all devices before you start redistribution.
>While practicing, you should be able to anticipate what things you'll
>see and where you will see them. If you are surprised by anything, figure
it out!
>
>But you don't want to wait until your last 30 minute check of things to
>discover that someplace along the way you screwed half of your routing
>table! That makes a very expensive lunch you just had!
>
>HTH,
>
>
>Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
>JNCIE-M #153, CISSP, et al.
>CCSI/JNCI-M/JNCI-ER
>VP - Technical Training - IPexpert, Inc.
>IPexpert Sr. Technical Instructor
>
>A Cisco Learning Partner - We Accept Learning Credits!
>
>smorris@ipexpert.com
>
>Telephone: +1.810.326.1444
>Fax: +1.810.454.0130
>http://www.ipexpert.com
>
>
>-----Original Message-----
>From: Mohamed M Moustafa [mailto:mmma@gawab.com]
>Sent: Tuesday, October 02, 2007 3:27 PM
>To: Scott Morris
>Cc: 'Brian Dennis'; ccielab@groupstudy.com
>Subject: RE: Mutual redistribution and loop prevention
>
>Hi Scott,
>
>Thank you very much, i'll make sure to eliminate all those tedious
>routing loops, but one last question if i may, if i was told to use AD,
>and i used a conjunction of AD and tagging + filtering, am i ok with
>that or what, as most of the scenarios won't go fine with just
>manipulating the AD.
>
>
>Thank you again both of you Brian and Scott for your influence in the
>field.
>
>BR,
>Mohammed Mahmoud.
>
>
>Scott Morris <smorris@ipexpert.com> wrote on 2 Oct 2007, 05:28 PM:
>Subject: RE: Mutual redistribution and loop prevention
>>While optimal routing is not a requirement, I'd venture to say that
>>pure reachability is!
>>
>>
>>Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
>>JNCIE-M #153, CISSP, et al.
>>CCSI/JNCI-M/JNCI-ER
>>VP - Technical Training - IPexpert, Inc.
>>IPexpert Sr. Technical Instructor
>>
>>A Cisco Learning Partner - We Accept Learning Credits!
>>
>>smorris@ipexpert.com
>>
>>Telephone: +1.810.326.1444
>>Fax: +1.810.454.0130
>>http://www.ipexpert.com
>>
>>
>>-----Original Message-----
>>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>>Of Mohamed M Moustafa
>>Sent: Tuesday, October 02, 2007 2:34 AM
>>To: Brian Dennis
>>Cc: ccielab@groupstudy.com
>>Subject: Re: Mutual redistribution and loop prevention
>>
>>Hi Brian,
>>Thank you very much for your response, but do i have to insure full
>>reachability even for example for routes received from the BB routers,
>>and prevent all kind of routing loops, even if i am not asked to, what
>>is scope of full reahability.
>>BR,
>>Mohammed Mahmoud.
>>Brian Dennis <bdennis@internetworkexpert.com> wrote on 2 Oct 2007,
>>08:12
>>AM:
>>Subject: Re: Mutual redistribution and loop prevention Do whatever you
>>need to ensure full reachability. If a routing loop is causing you to
>>not have full reachability then resolve it.
>>HTH,
>>Brian Dennis, CCIE4 #2210 (R&S/ISP-Dial/Security/SP)
>>bdennis@internetworkexpert.com Internetwork Expert, Inc.
>>http://www.InternetworkExpert.com
>>Toll Free: 877-224-8987
>>Direct: 775-745-6404 (Outside the US and Canada) On Oct 2, 2007, at
>>5:12 AM, Mohamed M Moustafa wrote:
>>Hi everybody,
>>I heard a lot about over thinking tasks in the exam, and i've a small
>>question to know if i am over thinking this issue or not, it is
>>regarding mutual redistribution and loop prevention.
>>Lets assume that i was asked to do a lot of mutual redistributions,
>>which eventually will cause routing loops, and after wards i was asked
>>to prevent certain routing loops at certain points in the network,
>>does this mean that i don't have to prevent all routing loops at all
>>points in the network, just the loops i was asked to prevent, or do i
>>have to prevent all routing loops in the topology, which is sometimes
>>cumbersome.
>>BR,
>>Mohammed Mahmoud.
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