From: Mohamed M Moustafa (mmma@gawab.com)
Date: Wed Oct 03 2007 - 04:48:58 ART
Hi Scott,
Totally agree with you, and i will go on with this strategy, but here comes
the last question if i was ordered to use a method rather than tagging,
lets say AD or route filtering, would i have to go back and remove all the
tagging that i've done, or can i peacefully keep it.
BR,
Mohammed Mahmoud.
Scott Morris <smorris@ipexpert.com> wrote on 3 Oct 2007, 04:42 AM:
Subject: RE: Mutual redistribution and loop prevention
>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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>>
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