This update adds a chapter for BGP on VRF-lite, providing instructions for setting up the large-scale protocol to be used to communicate routing information between autonomous systems.
Virtual Routing and Forwarding (VRF) allows a physical layer 3 switch or router to be partitioned into multiple Virtual Routers (VRs). The control and data plane are isolated in each VR so that traffic does not flow across VRs, thus allowing multiple routing tables to co-exist within one physical L3 switch/router at the same time. Route leaking VRF routes to and from the global routing table (consisting of ports that are not members of any VRF) is also supported which allows traffic to flow outside of the VRF. Dell Networking N3xxx and N4xxx switches running firmware version 6.2 or later can take advantage of these features.
There are several benefits to implementing VRF lite. The ability to configure multiple VRs in a single switch/router reduces the amount of physical equipment required, creating a sizable cost advantage. VRs also allow more efficient updates by upgrading only a single switch/router instead of several. It also allows customers to test configurations on the same equipment that is used in a proven production environment, making new additions easier to implement.
This paper provides instructions and examples on deploying VRF-lite on Dell N-Series switches.