Re: Redistribution best practices

I think the question becomes - why are you filleting the redistributed
routes. In the topology that you have, is it required to filter or change
the administrative distance because something is broken?

OR
Is it because you do it out of habit and are not really sure of the why you
are doing it?

I agree that there are best practices in redistribution, but from one
scenario to another there may me variance in which method you use.

So understand the technologies and their interaction with one another is key
in completing a redistribution scenario.

What I did in my preparation ( many years ago ) was to setup a
redistribution scenario and do the redistribution without and filtering or
marking of the routes. I would observe the routing loops take place and
identify why they took place and then was able to deploy a redistribution
method that I could reliably use as my favorite one. Always have a backup in
case you are not allowed to use your favorite.

Thanks
Larry Hadrava
CCIE #12203 CCNP
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com

On Mon, Jul 13, 2009 at 6:14 PM, Con Spathas <ccie19226_at_googlemail.com>wrote:

> If you only have 1 point of redistribution, you shouldn't have any
> issues with loops.
>
> I wouldn't bother with the extra config unless it's required, and risk
> losing points because you inadvertently break some other requirement.
> Spend the time configuring other tasks which can earn you points.
>
> On Mon, Jul 13, 2009 at 10:58 PM, Rameez Khan<rameezk1999_at_gmail.com>
> wrote:
> > thanks salah,
> >
> > tags n route-maps are helpful if you have two redistribution points
> between
> > the same IGP protocols.
> >
> > but i am talking about the scenario in which you have only 1
> redistribution
> > point. using distance command on that point will cause me to loose points
> > even though if its not required?
> >
> > On Tue, Jul 14, 2009 at 12:49 AM, Salah ElShekeil <
> salah.elshekeil_at_gmail.com
> >> wrote:
> >
> >> It depends but I prefer using tag and route-maps as far as I know it's
> >> the best way,
> >>
> >>
> >>
> >> in addition to the distance command,
> >>
> >>
> >>
> >> INE vol 3 is for the core stuff, I strongly recommend you to lab it up
> >>
> >>
> >>
> >> Good luck
> >>
> >>
> >> On Tue, Jul 14, 2009 at 12:43 AM, Rameez Khan <rameezk1999_at_gmail.com
> >wrote:
> >>
> >>> Dear GS,
> >>>
> >>> Whenever i redistribute from a higher Administrative Distance Protocol
> >>> (RIP) to a lower administrative distance protocol (OSPF), i use
> "distance
> >>> ospf external 130" command in ospf routing process as a best practice
> to
> >>> avoid reflect back routes from causing a loop.
> >>>
> >>> Using this practice is useful, if the next downstream neighbor in OSPF
> >>> domain is a HUB with split horizon disabled.
> >>>
> >>> But if the downstream neighbor is a point-to-point end router, than
> using
> >>> the "distance command" does not make sense if the split horizon is
> >>> enabled.
> >>>
> >>> But as a safety measure can i use the "distance" command in the above
> >>> point
> >>> to point topology? what if the proctor disable split horizon the other
> >>> end,
> >>> it will help me in this situation?
> >>>
> >>> using "distance ospf external" command as a safety measure will cause
> me
> >>> to
> >>> loose points in the R/S lab even if it is not required??
> >>>
> >>> please answer
> >>>
> >>>
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> >>>
> >>>
> >>
> >>
> >> --
> >> Salah
> >> CCIE #24207
> >
> >
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Received on Mon Jul 13 2009 - 19:45:49 ART