[c-nsp] routing question

[Joseph Jackson]

I believe you could do OSPF on the internet borders and do a default
originate and then the OSPF costs would take over. Which is what I
believe the other poster is leading up too.  


Joseph 

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net 
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Dan
> Sent: Wednesday, April 04, 2007 7:08 PM
> To: bep at whack.org
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] routing question
> 
> Bruce Pinsky wrote:
> > Dan wrote:
> > > Hello,
> >
> > > Diagram:
> > >
> > 
> http://bp0.blogger.com/_ZwoccirELZg/RhPQ4QRWSEI/AAAAAAAAAAM/Jn
> XNbHL_PQs/s1600-h/routing+question.jpg
> >
> > > I have all of my 3550's & 3560's running ospf and the 
> 2950's & 2960's
> > > trunking to the 3550's and 3560's.  I would like for location
> > 2960-14 to
> > > get its internet from Internet West and location 2960-07 
> to get its
> > > internet from Internet East.  Currently the 0.0.0.0 
> 0.0.0.0 1.1.1.1
> > > (default gateway) is causing them both to resort to Internet west.
> > (hope
> > > this is not to confusing)
> >
> > > Is there a way I can route the default gateway according to source
> > > networks without having to use PBR?  The reason I don't 
> want to use PBR
> > > is because if there is any significant amount of traffic 
> going through
> > > the 3550 or 3560 it will cause really high cpu utilization on the
> > > switch.  Is there some kind of static routing that can be 
> done, or can
> > > use use the 0.0.0.0 0.0.0.0 1.1.1.1 route command 
> according to source
> > > subnet?
> >
> > > eg:
> >
> > > if the source ip is 192.168.7.0/24 then use default 
> gateway 0.0.0.0
> > > 0.0.0.0 2.2.2.2 instead?
> >
> > > The other question is should I replace this switch with a router
> > instead?
> >
> >
> > If you are running OSPF and the costs are as shown in your 
> diagram, why
> > aren't normally IGP metrics taking you to the closest exit 
> point?  Aren't
> > you generating default from the Internet gateways?
> On switch 3550-02 the default route of 0.0.0.0 0.0.0.0 10.50.2.24 is
> pointing to switch 3550-24.  The default route on that switch 
> is 0.0.0.0
> 0.0.0.0 10.50.1.20 which is 3560-20 and then it hits the router.  So
> locations 2960-14 & 2960-07 are getting there internet from Internet
> west because of the default routes.  What I want to do is 
> have location
> 2960-07 get its internet from Internet east.
> 
> > You could, of course, use VRF-lite and place them in 
> separate routing
> > instances in lieu of PBR.
> >
> I still need the ospf routes to work, does this forward all 
> traffic to a
> different destination?
> Would you have an example of this?
> 
> Dan.
> 
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