From: Richard Davidson (rich@myhomemail.net)
Date: Sat Dec 13 2003 - 16:35:41 GMT-3
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
--- 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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