Are you considering redundancy to protect your network for a fiber cut or local network failure?
Network upgrades and 49 new underseas cables have protected international bandwidth effects from Japan Earthquake.
Whether to backup your WAN with a secondary fail-over network is a business decision worth evaluating. Networks fail. The question is, at what cost.
Virtual Private LAN Service (VPLS) simplifies Disaster Recovery and Business Continuity because VPLS works at a lower network level than the IP address; it works at the machine address (MAC address). This makes the IP address transferrable anywhere in the network.