Re: Best practices for Redistribution

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Sun Sep 03 2006 - 11:11:16 ART

Hello,

With complex redistribution, try to follow three simple rules of thumb:

1) Make sure that every protocol's native (internal) AD is lower than any
other protocol's external AD.

2) Make sure external routes' metric is higher (worser) than any native
prefix metric.

3) Make sure you don't import back into routing domain it's own routes.
Usually a tagging or prefix filtering is used to accomplish this goal.

HTH

2006/9/3, Joshua Lauer <jslauer@hotmail.com>:
>
> I'll second that,
>
> redistribution is an important key area in any lab,
> knowing when to redistribute (and why) can make or
> break you as you have found out.
>
>
> josh
>
>
> Joshua Lauer
>
> CCIE#16024
>
> CCNP, CCSP, CCDP, CCIP, INFOSEC
>
>
> ----- Original Message -----
> From: "Sean C." <Upp_and_Upp@hotmail.com>
> To: "Paul Thomas" <paultf@emirates.net.ae>; "'Cisco
> certification'" <ccielab@groupstudy.com>
> Sent: Sunday, September 03, 2006 10:57 AM
> Subject: Re: Best practices for Redistribution
>
>
> > Hi Paul,
> >
> > Unfortunately, I can't offer one redistribution
> > document, because there are
> > soooo many items that go into redistributing
> > between routing protocols.
> > But, having glanced at most some of the labs from
> > each of the major vendors
> > (ccBoot, InternetworkExpert, IPExpert, & NMC),
> > concerning redistribution, I
> > can suggest you invest in NMC's lab books. Each
> > vendor has their
> > strengths - and I think the general consensus is
> > that one of NMC's strengths
> > are their routing redistribution scenarios. Yes,
> > it's easy to create
> > complex routing scenarios, but where NMC excels is
> > in explaining the
> > ins-and-outs and nuances of different
> > redistribution scenarios.
> >
> > It's an older document, but look on their website
> > for a .pdf called 'A
> > Scenario with Multiple Redistribution Points' at:
> > http://www.netmasterclass.net/site/libpdf.php#
> > The doc certainly doesn't cover everything, but
> > can give you a primer of
> > what you're in for.
> >
> > Drop Indy an email. HTH,
> > Sean
> >
> > ----- Original Message -----
> > From: "Paul Thomas" <paultf@emirates.net.ae>
> > To: "'Cisco certification'"
> > <ccielab@groupstudy.com>
> > Sent: Sunday, September 03, 2006 1:36 AM
> > Subject: Best practices for Redistribution
> >
> >
> > Hi All,
> >
> > I am looking for best practices in redistributing
> > between routing protocols.
> > I always fails in my practice lab when it reaches
> > the redistribution part.
> > If anyone in this group could light me up to find
> > a document on
> > redistribution will be great.
> >
> > Regards
> > PT
> >
> > _______________________________________________________________________
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> >
> > _______________________________________________________________________
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>
> _______________________________________________________________________
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> 

-- 
Petr Lapukhov, CCIE #16379
petr@internetworkexpert.com

Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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