From: Christian Sica (csica@liweb.net)
Date: Fri Sep 16 2005 - 11:06:32 GMT-3
Hi Jens,
What I think you will want to use here is the suppress-map feature of the
aggregate route. The unsuppress-map is applied to you BGP neighbors and the
suppress-map is applied directly to the aggregate route. So keeping in mind
what each map does will help you determine which one you need to use.
An unsuppress-map is used to advertise routes that were suppressed by using
the summary-only, for example, on the aggregate route. The suppress-map
allows you to selectively suppress routes matched by this route map.
Neither the suppress-map or the unsuppress-map will actually filter the
aggregate route itself, these control only more specific routes.
So if you wanted to suppress all specific routes, why not use a suppress-map
that matches everything. Then only the aggregate would be advertised and
without the use of the summary-only feature. As an example:
!
router bgp 1
network 10.50.100.0 mask 255.255.255.0
aggregate-route 10.0.0.0 255.0.0.0 suppress-map SUPPRESSED
!
route-map SUPPRESSED permit 10
!
HTH,
Christian
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Jens
Petter Eikeland
Sent: Friday, September 16, 2005 9:40 AM
To: 'Quetta Walla'
Cc: ccielab@groupstudy.com
Subject: SV: ip prefix-list or...
So what you are saying here :
", then you have to suppress all except the onw u want to appear there."
Yes... this is the requerment, so I need to get rid of those routes.. How
will you accomplish this with a unsupress-map.. show me what you mean by
config, because I can not see how this will meet the requerments
Jens Petter Eikeland
-----Opprinnelig melding-----
Fra: Quetta Walla [mailto:quetta_1@lycos.com]
Sendt: 16. september 2005 13:22
Til: Jens Petter Eikeland
Kopi: ccielab@groupstudy.com
Emne: Re: ip prefix-list or...
Permit the only aggregated route through prefix-list.
And for requirement of only only prefix to appear, use
neighbor x.x.x.x unsuppress-map WORD Name of route map
suppress-map suppreses routes, then you have to suppress all except the onw
u want to appear there. So dont you think unsuppress will be a better
option.
----- Original Message -----
From: "Jens Petter Eikeland" <jenseike@start.no>
To: ccielab@groupstudy.com
Subject: ip prefix-list or...
Date: Fri, 16 Sep 2005 04:54:32 +0200
>
> hi all..
> i need some help with making bgp filter..
>
> task :
>
> Summarize BGP networks on R5 (207.168.1.0, 207.168.2.0, 207.168.21.0, and
> 207.168.22.0)
> Do not use summary-only command
> Do not let specific routes to appear except for 207.168.5.0..
>
> I guess task 1 is: I want an exact match on the aggregat, but I am not
that
> familiar with making this, so help please..
>
> answer : use prefix-lists??
>
> And task 2 is : make only the summary and the one spesific route to show
in
> bgp table.
>
> answer : use supress-map??
>
> Not sure if this are the way to do it, but if it is I would also like to
> know how to make that prefix-list.. step-by-step
>
> jens p
>
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