We are currently reviewing a design proposal for our WAN.
1 link will be a Point-to-Point Ethernet private line connection between 2 3750e's running RIP. (The interfaces on each end are configured as a layer 3 interface).
The other link will be connected via an Internet connection on both ends. This connection will be achieved via "nailed" up Encrypted Tunnelling bridging devices.
These devices will be connected on the LAN side to the 3750e's as switch ports.
Will traffic be load balanced over these 2 links ? (I'm thinking no)
The primary goal of this proposal is to provide WAN redundancy.
I personally think there are better ways to achieve this w/out getting into non cisco tunnel bridges.