[c-nsp] BGP to OSPF redistribution

[null zeroroute]

Thanks for your suggestion.  We want to use OSPF because it will scale more
easily in our network.  For example, if we ran BGP over the layer-2
providers network, we would need (today) 25 neighbors at every site, every
time a new site is added new neighbors need to be created everywhere, etc to
keep the one hop away design.  Route-reflectors got too complicated.  It's
also very helpful to have firewalls running OSPF when there are multiple
egress points to extranet partner locations or the internet etc.

On Wed, Jan 13, 2010 at 4:43 PM, Vincent C Jones <
v.jones at networkingunlimited.com> wrote:

> On Wed, 2010-01-13 at 21:50 +0100, Mikael Abrahamsson wrote:
> > On Wed, 13 Jan 2010, null zeroroute wrote:
> >
> > > Is there a way to redistribute BGP into OSPF so that the routes can be
> > > anything but OSPF external?
> >
> > Change in what order routing protocols are selected (administrative
> > distance):
> >
> >
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094195.shtml
> >
>
> Have you considered converting your current WAN OSPF links to BGP so you
> can use standard BGP route preference controls to select the best route?
>
> If that is not possible, another approach (albeit painful) is to use
> route summarization/fragmentation so that the BGP routes are longer
> prefixes than the remote OSPF routes.
>
> Good luck and have fun!
> --
> Vincent C. Jones
> Networking Unlimited, Inc.
> Phone: +1 201 568-7810
> V.Jones at NetworkingUnlimited.com
>
>