We have two sites connected by two equal cost Metro Ethernet circuits from two different service providers. we also have two redundant L3 core switches at both sites. What is the best way to connect these two sites for load balancing as well as redundancy? They are on different subnets. The core switches currently run HSRP. We also evaluating GLBP as a possible alternative.We want to possibly avoid all single points of failure.
You could, as you note, use GLBP, but an alternative could be, make the two paths from the intial/primary HSRP gateway appear equal cost. Many routing protocols would then alternate flows across the two paths.
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