Failover between 2 sites


We have the following network setup (see attachment). What we would like to do is the following:

*Under normal circumstances, the wireless network connection should be the only active link. All data must pass there.
*If there is a problem with the wireless network (either a hardware failure, or wireless link failure), the secondary link should take over (if possible, without any downtime).

Some additional information:
*The machines that provide the wireless link are in bridge mode, and this cannot be changed.
*The ISP routers are not managed by us, so ideally the configuration there should not be changed.

I can see 2 options:
-Use a routing protocol on both 800 series routers, and place a static route on both default gateways with a higher metric to the secondary link).
-Use Cisco IP SLA (i have no experience using this so if anyone has hands-on experience, this would be much appreciated).

Can anyone give me some advice on which option is the best, or if there is another possibility. If using a routing protocol is the best, which protocol would you advise (rip?).

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Don JohnstonInstructorCommented:
I would use a routing protocol. Easier to setup than SLA.

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I will Suggest Routing OSPF,EIGRP if your routers support it or RIP combined with HSRP for Your Networks
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I have a scenario just like this.  I am using L2TPv3 to create a Layer2 tunnel between both locations, plug an ethernet cable from the two tunnels into the main switch, and let RSTP handle which path to take (of course, make STP prefer the main link when it is up).

The only caveat here is L2TPv3 can take more traffic to run than just layer3 routing because broadcasts will go across as well.  To counteract that though, I picked up a couple of SA-VAM cards for $30 each on ebay.  They can encrypt/compress up to 160MBits/second.
i would use tunnel interfaces and use "tunnel protection" if your 800 routers support it and in the tunnels i would run a routing protocol of your choise. this way u can combine ipsec security with multicast routing.

we use this type of setup a lot, although we are using bigger routers.
tombourAuthor Commented:
I am gonna go with OSPF/EIGRP with static route as backup. Since there is no "definitive" answer for this question, and i was looking for opinions, i've split the points between everyone. Thanks
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