Hi,
I do not believe that it works to have 2 GRE tunnels with exactly the same source and destination addresses between 2 routers. I believe that there must be at least one unique address (source or destination) for each tunnel.
http://www.cisco.com/en/US/docs/ios/interface/command/reference/ir_t2.html#wp1012689
Usage Guidelines
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The source address is either an explicitly defined IP address or the IP address assigned to the specified interface.
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You cannot have two tunnels using the same encapsulation mode with exactly the same source and destination address. The workaround is to create a loopback interface and source packets off of the loopback interface.
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When using tunnels to Cayman boxes, you must set the tunnel source command to an explicit IP address on the same subnet as the Cayman box, not the tunnel itself.
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GRE tunnel encapsulation and deencapsulation for multicast packets are handled by the hardware in PFC3 and 12.2(18)SXF and later releases. Each hardware-assisted tunnel must have a unique source. Hardware-assisted tunnels cannot share a source even if the destinations are different. You should use secondary addresses on loopback interfaces or create multiple loopback interfaces to ensure the hardware-assisted tunnels do not share a source.
Regards
Please rate if it ehlps.
