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The Cisco CSR 1000V is a software router that an enterprise or a cloud provider can deploy as a virtual machine (VM) in a provider-hosted cloud. It can run on Cisco Unified Computing System (Cisco UCS) servers as well as servers from leading vendors that support VMware ESXi, Citrix XenServer, Microsoft Hyper-V, Red Hat KVM virtualization, or on the Amazon EC2 cloud.
A typical cloud provides IT infrastructure and resources to multiple customers or tenants. The Cisco CSR 1000V serves primarily as a router per tenant. That is, each tenant gets its own routing instance, hence its own VPN connections, firewall policies, QoS rules, access control, and so on.