Solved

Cisco 3750 default routing with multiple ISP connections between multiple sites

Posted on 2007-11-27
4
1,061 Views
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
0
Comment
Question by:Matsco
  • 2
  • 2
4 Comments
 
LVL 50

Accepted Solution

by:
Don Johnston earned 500 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.

0
 
LVL 1

Author Comment

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.
0
 
LVL 1

Author Comment

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??
0
 
LVL 50

Expert Comment

by:Don Johnston
ID: 20365438
Yep. :-)
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
Use of TCL script on Cisco devices:  - create file and merge it with running configuration to apply configuration changes
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Both in life and business – not all partnerships are created equal. Spend 30 short minutes with us to learn:   • Key questions to ask when considering a partnership to accelerate your business into the cloud • Pitfalls and mistakes other partners…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question