[c-nsp] routing question

[Bruce Pinsky]

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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?

You could, of course, use VRF-lite and place them in separate routing
instances in lieu of PBR.

- --
=========
bep

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