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DSL / Frame Relay Failover

By CajunFoxtrotter ·
One of the remote offices on our WAN is connected to the WAN with a 128K Frame-Relay loop using a Cisco 3810 router. We have recently installed a DSL for internet connection to relieve the load on the Frame. The DSL has a Netopia Cayman 3546 modem/router. We currently have the network routing done by the Cisco using a default route for internet to the Cayman. The remainder of the routes are static pointing back to the WAN. We would like to have a failover back to the Frame for Internet if the DSL goes down. I have tried to using 2 default routes controlled by metrics, but that doesn't work: 0.0.0.0 0.0.0.0 192.168.67.200 to the Netopia, 0.0.0.0 0.0.0.0 192.168.67.254 100 to the Cisco. If the DSL is disconnected it should failover to the Cisco, NOT!
Anyone got an Idea?

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by charles_j_smith In reply to DSL / Frame Relay Failove ...

The static route with the metric was a good thought, but since you are not using a dynamic routing protocol (ospf, etc.), it will not sense that the dsl side is down because the physical link on the router doesn't go down.

Here is a thought (again, I am trying to think of how to do this with the provided equipment you have, but not quite sure at this moment). So, I have used this piece of equipment with multiple dsl providers. It works quite well. This is the router (Nexland 800 turbo):
http://www.overclockersclub.com/nexland.shtml

The problem I see with your issue, is that the DSL side has no way to tell the Cisco that it is down - and the Cisco has no way to sense whether the dsl is down or not. The router I listed actually runs pings to its default gateway on each connection.. so if either one goes down he will no longer send anything that way....

Hmm, here is a thought if you are a script head. You could write a script that would continuously ping the default gateway of the dsl connection. (I'm thinking you have a linux box in your local network somewhere). Then when that linux box can't ping that, it could go out - login to the Cisco and remove any route statements pointing toward the dsl side. - This will take a little more thought, but just wanted to get something started.

Chuck

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by CajunFoxtrotter In reply to

Two problems, there are no Linux boxes on that network, and I am not a script head. Both of the routers in the question do support RIP2. I am not sure about OSPF

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by -Q-240248 In reply to DSL / Frame Relay Failove ...

You must use dynamic routing, static won't work. RIP2 may work, but prefer OSPF.

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by uffe.sommerlund In reply to DSL / Frame Relay Failove ...

look at the cisco pages

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by CajunFoxtrotter In reply to DSL / Frame Relay Failove ...

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