From: Luan Nguyen (luan.m.nguyen@gmail.com)
Date: Thu May 08 2008 - 14:04:31 ART
Set what BGP attributes? So what you could match on your outbound
prepending route-map?
How do you tag routes from one ospf router to another? tagging between
routing protocols is easy, but within one protocol then I've never seen.
Thanks.
-lmn
On Thu, May 8, 2008 at 12:09 PM, Joseph Brunner <joe@affirmedsystems.com>
wrote:
> Why not tag the routes earlier on in the OSPF network?
>
>
>
> Then the route-map can match tags from OSPF and set bgp attributes
> accordingly?
>
>
>
> I would do this though (if you can)
>
>
>
> Put the ospf facing interface into a vrf.
>
>
>
> On the bgp config for "address-family ipv4 vrf 9999" you can redistribute
> into bgp and match ospf routes types you want to redistribute. The upstream
> interface on the CE can also be in this VRF and not know it. ;)
>
> _____
>
> From: Luan Nguyen [mailto:luan.m.nguyen@gmail.com]
> Sent: Thursday, May 08, 2008 11:01 AM
> To: Joseph Brunner
> Cc: ccielab@groupstudy.com
> Subject: Re: Prepend routes redistribute from OSPF to BGP
>
>
>
> Well, it's just between the PE and the CE so it's not that bad :)
> The operation folks refuse to work with big prefix-list. They want a
> "dynamic" solution. So each time the customer adds a network into OSPF,
> you
> don't have to create another prefixes.
> The problem is that i see little options matching IGP when comes to BGP
> route-map.
> Just when you think route redistribution in the lab is bad...you meet the
> real 2 headed monter: customer's demands and support's stubborness.
>
> -lmn
>
> On Wed, May 7, 2008 at 10:59 PM, Joseph Brunner <joe@affirmedsystems.com>
> wrote:
>
> I would vote against redistributing an igp into bgp... everytime someone
> does a "clear ip ospf process" millions of routers around the world waste
> cpu time - THANKS!!!
>
> A better idea is if this is the ONLY place where these blocks will be
> advertised to bgp, just redistribute static's to BGP (the statics will be
> held down with ip route w.x.y.z 255.255.x.0 null0 254
>
> Many big ISP's do this.
>
> Since you are going to prepend you can just write up some big prefix-lists
> and match in them in route map sequences for the as path prepends.
>
> Nothing fancy... I have seen 500 networks done this way... no biggie.
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Luan
> Nguyen
> Sent: Wednesday, May 07, 2008 10:53 PM
> To: ccielab@groupstudy.com
> Subject: Prepend routes redistribute from OSPF to BGP
>
> Hello,
>
> Say i have a broadcast network of 10 OSPF routers. Each have a variety of
> inter, intra, external routes.
> One router peer BGP with an upstream. I want to advertise all OSPF
> networks
> to the upstream. But i want a set of routes to have AS-PATH prepend. I
> need to redistribute OSPF into BGP since the amount of routes are too many
> to use network statements and too discontinuous to advertise summary
> routes.
> Any idea how i could accomplish this?
>
> TIA
>
> -lmn
>
>
>
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