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Site-to-Site VPN Load Balancing with Cisco

What I am wondering about is if there is a way to load balance 2 VPN tunnels as one..  The picture below shows my situation... I have a site with 1 ISP that has a 2821 router, and a 2nd site with 2 different ISPs with a cisco 1841 router.  I am wondering if I can establish 2 seperate tunnels between the devices, and then somehow loadbalance traffic over the 2 seperate tunnels?  The reason I want to set this up is because the ISP3 in the picture below is much better than ISP1 and 2 and we are maxed out with ISP1 and 2 as far as bandwidth goes.

I am not interested in purchasing a seperate piece of equipment to handle the VPN load balancing... Just wondering if it is possible with the Ciscos we have?

 Example Picture
If that does not work out, then I am planning on establishing the 2 VPN tunnels, and sending some of our traffic through 1 tunnel, and the rest through the 2nd tunnel..  If you know of any problems with that type of setup, please feel free to let me know..

Appreciate any help you can provide!

Thanks!
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cathchar
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cathchar
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ffleismaSenior Network EngineerCommented:
you can setup an GRE over ipsec instead of the normal l2l ipsec. the difference is that GRE over ipsec can carry routed protocols over the ipsec, effectively you would then be able to setup a routing protocol between the sites. OSPF and EIGRP are two routing protocols that enables load balancing.

with just an l2l ipsec VPN, i don't think you could load balance but you can have the setup fail-over for redundancy.

hope this helps :-)
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cathcharAuthor Commented:
I've heard of GRE,,, but not too familiar with it... If anyone has any links about configuring GRE over IPSEC on ciscos, I'd be thankful for your post..

I definately need the encryption, so GRE over IPSEC sounds great...

Thanks ffleisma,,,  keep the info coming if you got it guys.,.. Appreciate it!
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cathcharAuthor Commented:
Great info.. Exactly what I am looking for.  Thanks!
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