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Cisco Cisco Virtual Topology System 1.5 White Paper

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© 2015 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. 
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For this example, assume that the networks, subnets, hosts, and routers are created through OpenStack. Also 
assume that the user creates two networks, attaches one or more virtual machines to each network, and connects 
those networks through a router. The routing element will be implemented as a distributed Layer 2 and 3 gateway 
within the data center infrastructure, with anycast gateways provisioned on ToR switches and VTFs. Figure 5 
shows the step sequence. 
Figure 5.    Sample Cisco Virtual Topology System Deployment to Understand the Data Plane 
 
1.  Tenant and tenant networks are created in OpenStack. 
2.  The OpenStack Neutron plug-in intercepts the request and creates tenant and tenant networks within Virtual 
Topology System. 
3.  VXLAN VNID is assigned for each network. 
4.  OpenStack user attaches virtual machines to the networks. 
5.  Information about the new VM is passed to VTS via the VTS Neutron plugin. 
6.  Virtual Topology System provisions VTEP on the respective ToR switches and configures VLANs to the 
computing host. 
 
7.  Neutron agent on the host programs the vSwitch with the right VLAN.