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As Alain and John have described, you can load balance, for the same subnet, if mHSRP is supported. For different subnets, you can alternate which router hosts the active gateway, i.e. mHSRP isn't required. The former also requires you somehow have hosts use the different mHSRP IPs, which is a pain. If you're equipment supports GLBP, you might find that a "better" solution.