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Cisco 3750 default routing with multiple ISP connections between multiple sites

Posted on 2007-11-27
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Last Modified: 2008-02-29
Hello,

We have two sites connected with redundant 1gb & 100mb point to point links. At both sites we have Cisco 3750 switch stacks vlaned with c3750-advipservicesk9-mz.122-40.SE installed. Internet is at each site with different ISPs and connect to the switch stacks via ASA 5510 v7.2(2) firewalls. We are running EIGRP internally. The point to point links are connected straight to the switch stacks which have been changed to router ports using "€œno switchport".

Site A has servers and the fastest internet connection. Site B has servers, users and a much slower internet connection.

We want to configure routing so internet traffic for both sites goes through site A. If site A' internet goes down traffic should route through site B.

We cannot use BGP or change the internet connections in any way, it needs to be done with the existing hardware.

Any thoughts on the best way to tackle this?

Many thanks in advance
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Question by:Matsco
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Don Johnston earned 1500 total points
ID: 20361472
One way would be to redistribute the default route from each 3750. Use a higher default cost for the route from the slower site.

You also use object tracking to insure the route is removed should the path fail in a way that can't be detected.

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by:Matsco
ID: 20361751
Object tracking is what I thought would be needed however I'm not sure our IOS version on the switch supports ip route 0.0.0.0 0.0.0.0 192.168.1.101 track 123    style of commands. If so that would be perfect.

The documentation doesn't have any mention about the "track" option and I don't have access to the site to test at the moment.
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by:Matsco
ID: 20362153
If I get the ASA's to participate in the dynamic routing (upgrade to 8.x or use OSPF) then they can track the internet independently then inject the routes to the network.

Should work nicely shouldn't it??
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by:Don Johnston
ID: 20365438
Yep. :-)
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