Initial Configuration › Create Custom Virtual Interfaces

Create Custom Virtual Interfaces

You can create custom virtual interfaces (CVIs) to report on subnet traffic. Create CVIs for a network that is designed in the following way:

• Traffic from a data center is transferred to subnets through an MPLS carrier cloud, and
• Flow is enabled on the routers in the data center rather than on the routers on the edge of the cloud.

Without virtual interfaces, you have limited visibility into which subnets actually generate the network traffic for the carrier cloud. Virtual interfaces help ensure that you can collect detailed data about the subnet traffic in this type of configuration.

Defining a custom virtual interface (CVI) separates traffic for an interface from other traffic. The CVI in the diagram separates specific traffic from other traffic traveling to and from the data center into the cloud.