We need to build a redundant Gbps VPN platform for partner and 3rd party connections. A big discussion started whether to go for layer 2 (HSRP/GLBP) or layer 3 (OSPF) redundancy. Now I'm looking for the pros and cons re stability, complexity, convergence, etc.). Our concern for layer 2 is the risk of STP, broadcast storm, etc. which would take down both systems.