Edison,

Great post! You wouldn't know of a config example for me to look at, would you? I'm currently using OSPF in the network. Would this work if the Internet goes down?

James,

if you build the GRE tunnel at each end with the source and destination being the IP address used for the internet, then the GRE tunnel will go down hence the OSPF adjancency.

Once the OSPF adjancency via the tunnel goes down, the router will only have one path left - the T1.

Here is a sample config with GRE protected tunnel with OSPF.

The T1 is not part of this sample but having the T1 interface with a higher OSPF cost - it's all you need.

Regards,

Edison.

Edison,

Thanks for your reply. I didn't get the sample. Can you resend?

My apologies, I thought I included the URL on my previous reply, here it is:

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a00800a43f6.shtml

Regards

Edison.

Edison,

Thanks again for your help! I going to start working on this right now. Again, thanks!

Hi Edison, I have question on the same topic but with some addition.

I have gone through the link but still get how to overcome on this scenario.

Site_A-----------Site_B

I have IPSEC over GRE between Site_A and Site_B, in all there are 3 Tunnels between them.

Site_A has only one Service Provider

Site_B has Three Service Provider, each Tunnel going to Site_A is with different Service Provider.

Tunnel #1 works great when other tunnels are manually shutdown and it has static entry pointing to remote public IP.

Tunnel #2 doesnt work even if other tunnels are down ; same with Tunnel#3

I wanted to make all tunnels workings and have load balancing or let tunnel work in redunduncy scenario.