You can achieve high availability by connecting up to 4 ExpressRoute circuits in the same peering location to your virtual network. You can also connect up to 16 ExpressRoute circuits in different peering locations to your virtual network. For example, Singapore and Singapore2. If one ExpressRoute circuit disconnects, connectivity fails over to another ExpressRoute circuit. By default, traffic leaving your virtual network is routed based on Equal Cost Multi-path Routing (ECMP). You can use **connection weight** to prefer one circuit to another. For more information, see [Optimizing ExpressRoute Routing](expressroute-optimize-routing.md).
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