From: arvindyadav@comcast.net
Date: Sun Dec 14 2003 - 13:47:14 GMT-3
Yes you are right, try with exist-map
neighbor x.x.x.x advertise-map m1 exist-map m2
regds
Arvind
----- Original Message -----
From: "Richard Davidson" <rich@myhomemail.net>
To: "Richard Davidson" <rich@myhomemail.net>; <Arvinb@comcast.net>;
<vdadlaney@comcast.net>
Cc: "groupstudy" <ccielab@groupstudy.com>
Sent: Saturday, December 13, 2003 3:23 PM
Subject: Re: BGP summary address
> At first I didn't see the deny in your m2 route-map.
> "route-map m2 deny 10
> match ip address 2"
>
> It appears that you are trying to negate the
> non-exist-map. Is that possible? I have tried it and
> it doesn't work.
>
> Also, I think your access-lists 1 should read as
> follows.
> access-list 1 permit 199.10.111.0 0.0.0.0
> !
> !Not this:
> access-list 1 permit 199.10.111.0 0.0.0.255
> ^
> I think yours tells the router to send any
> 199.10.111.0-255 prefix.
>
> regardless, I have tried both.
>
> Rich
>
> --- Richard Davidson <rich@myhomemail.net> wrote:
> > All, thanks for the response.
> >
> > Arivnd
> > Yes, that was my original question. Correct me if I
> > am wrong. the neighbor x.x.x.x advertise-map m1
> > non-exist-map m2; command is used to advertise the
> > route in the advertise map if all of the routes in
> > the
> > non-exist-map are not in the routing table.
> >
> > I need to only advertise the summary if I have all
> > of
> > the 199.10.125.xxx prefixes.
> >
> > Rich
> >
> > Resources:
> >
>
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fipr
rp_r/bgp_r/1rfbgp1.htm#1166728
> >
> > --- Arvinb@comcast.net wrote:
> > > Richard
> > >
> > > I think original question was to advertise the
> > > summary address only when
> > > both the longer prefixes exists. By default router
> > > keep on advertising the
> > > summary address until it has a single longer
> > prefix
> > > route in the routing
> > > table. It stops advertising summary-address by
> > > defualt if it doesn't have
> > > any longer prefix in routing table.
> > >
> > > Conditional advetisement is BGP will advertise the
> > > summary-address when
> > > router looses some prefix specified in non-exist
> > > map. How about to use this.
> > >
> > > router bgp xxxx
> > > aggregate-address 199.10.111.0 255.255.255.0
> > > summary-only
> > > !
> > > neighbor x.x.x.x advertise-map m1 non-exist-map m2
> > >
> > > route-map m1 permit 10
> > > match ip address 1
> > >
> > > route-map m2 deny 10
> > > match ip address 2
> > >
> > > access-list 1 permit 199.10.111.0 0.0.0.255
> > > access-list 2 permit 199.10.111.160 0.0.0.7
> > > access-list 2 permit 199.10.111.168 0.0.0.7
> > >
> > >
> > > Arivnd
> > >
> > >
> > > ----- Original Message -----
> > > From: <vdadlaney@comcast.net>
> > > To: "Richard Davidson" <rich@myhomemail.net>
> > > Cc: "groupstudy" <ccielab@groupstudy.com>
> > > Sent: Saturday, December 13, 2003 11:12 AM
> > > Subject: Re: BGP summary address
> > >
> > >
> > > > Hi Richard,
> > > >
> > > > Are you sure you want to advertise a /24 for
> > these
> > > routes. I personally
> > > would aggregate to 199.10.111.160 255.255.255.240.
> > > Than as per your
> > > requirements you can do a aggregate-address
> > > 199.10.111.160 255.255.255.240
> > > summary-only or if you want the more specifics
> > than
> > > remove the summary-only.
> > > Once that is done than u can use a distribute-list
> > > on the neighbor statement
> > > to the ebgp peers to deny the more specific routes
> > > if you have not used the
> > > summary-only option and allow only the summary to
> > > your ebgp peers. Ofcourse
> > > if you want to send a /24 than you can aggregate
> > to
> > > that and follow the same
> > > method. I think that would work. If anyone thinks
> > > this might not work than
> > > please do correct me. Thanks
> > > >
> > > > Regards,
> > > >
> > > > Vikram
> > > > > I need to send a summary address from two bgp
> > > routers
> > > > > in one as to two other AS numbers. I need to
> > > only
> > > > > send the summary to the remote AS numbers if
> > the
> > > local
> > > > > router knows about all of the local routes
> > that
> > > fall
> > > > > under the summary. Is this possible.
> > > Basically, send
> > > > > 199.10.111.0/24 if; 199.10.111.160/29 and
> > > > > 199.10.111.168/29 exists.
> > > > >
> > > > > Thanks for the support
> > > > > Rich
> > > > >
> > > > > =====
> > > > > Richard Davidson
> > > > > Yahoo IM: r1davidson
> > > > > e-mail rich@myhomemail.net
> > > > >
> > > > >
> > >
> >
> _______________________________________________________________________
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> >
> > =====
> > Richard Davidson
> > Yahoo IM: r1davidson
> > e-mail rich@myhomemail.net
> >
> >
> _______________________________________________________________________
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>
> =====
> Richard Davidson
> Yahoo IM: r1davidson
> e-mail rich@myhomemail.net
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
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