RE: Inject Maps

And my take :)

You call your upstream SP 50 times per day asking for some more specific
components they ignore you and since you need them for something like
downstream advertisement; you "create" them yourself! Nice and easy.

HTH

--------------------------
Kambiz Agahian
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-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Roy Waterman
Sent: Friday, May 07, 2010 9:30 AM
To: Joe Astorino
Cc: smith; Cisco certification
Subject: Re: Inject Maps

If I may add to Joes explanation.

You may get asked to advertise a specific prefix 10.0.1.0/24 eg. to
another
BGP peer, yet you are only receiving the aggregate 10.0.0.0/22. Using an
inject map will help here.

Regards
Roy

On 7 May 2010 16:30, Joe Astorino <jastorino_at_ipexpert.com> wrote:

> The idea is that if you have some prefix in your BGP table, you can
> "un-aggregate" it and inject into BGP more specific prefix
> information. For exmaple, let's say you had 10.0.0.0/22 in your
> routing table, which is an aggregate of 10.0.0.0/24, 10.0.1.0/24,
> 10.0.2.0/24, and 10.0.3.0/24 and you want to inject into BGP the more
> specific /24 prefixes. An inject-map could help you with that. So in
> essence you would be taking that aggregate /22 route and
> "un-aggregating" it back to 4 /24 prefixes.
>
> HTH.
>
>
>
> On Fri, May 7, 2010 at 11:12 AM, smith <wilsmith0_at_gmail.com> wrote:
> > Hi Group,
> >
> > I am little bit confused with this. Could anyone please guide me, in
> which
> > situation a Inject Map is essential ?
> >
> > Many thanks.
> >
> > -
> > smith
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
Received on Fri May 07 2010 - 09:36:05 ART