Белая книга для Cisco Cisco Virtual Topology System 1.5

 

 

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Figure 6.    BGP EVPN Control-Plane Route Distribution 

 

Cisco Virtual Topology System Use Cases 

A primary use case addressed by the Virtual Topology System solution is traffic separation within a multi-tenant 

data center (Figure 8). For example, large enterprises have traditionally built and maintained separate physical 
infrastructures to meet compliance requirements. They maintain separate infrastructures for different departments’ 

networks within the organization. Although this approach provides the traffic separation that is needed for 

compliance, it also generates vast resource waste, because departments cannot use the physical resources that 

belong to each other. This approach is contrary to the oversubscription model that is well established in the service 

provider space. 

The Virtual Topology System software overlay solution allows customers to tap into the unused computing 

capacity, enabling greater utilization and better return on investment (ROI) while still meeting compliance 

requirements. For example, a data center network may have two tenant networks: Tenant 1 and Tenant 2. Both 

tenant networks terminate at the DCI, which allows MPLS, Cisco Locator/ID Separation Protocol (LISP), or plain IP 

WAN connectivity to the rest of the network. On the VTFs that reside on the computing hosts, a mesh of VXLAN 

tunnels are automatically created between all the VTFs and between the VTFs and the DCI gateway. The VTFs 

host the tenant networks for one or multiple tenants and provide traffic separation for the traffic belonging to 

different tenants, as well as encapsulation and decapsulation between the DCI gateway and the VTFs. 

The DCI routers peer with Virtual Topology System, which also acts as the route reflector.