[c-nsp] routing question

[Dan]

Bruce Pinsky wrote:
> Dan wrote:
> > Hello,
>
> > Diagram:
> >
> http://bp0.blogger.com/_ZwoccirELZg/RhPQ4QRWSEI/AAAAAAAAAAM/JnXNbHL_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.