[c-nsp] OSPF design (danger will)

[danger will]

Hi 

Let's clarify a bit
I wasn't saying don't run ospf at all , i was saying don't run ospf with your mpls provider, you can still run ospf internally in your site but run bgp with the mpls provider because by running ospf with the mpls provider , if you export a type 1 or 2 LSA, they will then redistribute your prefixes into BGP and you will receive an  LSA type 5 at your other sites which is incorrect because the OSPF route type is not preserved.
Normally if you as a client would own the CE and run OSPF with the PE
the OSPF route type would be preserved and you would get an LSA type 3 at your other sites which is correct.
With eigrp is even more clear internal eigrp routes from one site would arrive as external eigrp routes at the other sites if you run eigrp with your mpls provider 

O.

--- On Sun, 10/24/10, Gert Doering <gert at greenie.muc.de> wrote:

From: Gert Doering <gert at greenie.muc.de>
Subject: Re: [c-nsp] OSPF design (danger will)
To: "Christopher J. Wargaski" <wargo1 at gmail.com>
Cc: cisco-nsp at puck.nether.net
Date: Sunday, October 24, 2010, 11:03 PM

Hi,

On Sun, Oct 24, 2010 at 02:03:42PM -0500, Christopher J. Wargaski wrote:
> IMHO, run BGP (iBGP + eBGP) end to end and life will be much simpler.

Just running BGP with no IGP sounds... painful.

Full mesh doesn't scale, and route reflectors just don't work if you have
no routes to the loopbacks...

For a network with just 2 or 3 routers, yes, "just iBGP" will work fine,
but this thread was about a network with 100 routers.

gert

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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de

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