Virtual Routing and Forwarding (VRF)
Digi TransPort User Guide
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Virtual Routing and Forwarding (VRF)
Virtual Routing and Forwarding (VRF) is an IP technology that allows multiple instances of a
routing table to coexist on the same router at the same time. Because the routing instances are
independent, the same or overlapping IP addresses can be used without conflict. VRF is also used
to refer to a routing table instance that can exist in one or multiple instances per each VPN on a
Provider Edge (PE) router.
VRF-Lite (Multi-VRF)
VRF-Lite is an application based on VRF that extends the concept of VRF to the Customer Edge
(CE) router on the customer's premises. It supports multiple, overlapping, independent routing
and forwarding tables per customer.
Any routing protocol supported by normal VRF can be used in a VRF-Lite CE implementation. The
CE supports traffic separation between customer networks. As there is no MPLS functionality on
the CE, no label exchange happens between the CE and PE.
Information Model Objects (IMOs)
• Virtual Routing Forwarding (VRF) Entity (IVrf)
• Equivalent Routing Entry (IRoutingEntries)
• Virtual Routing Entry (IVrfEntry)
• Multi Protocol BGP Entity (IMpBgp)
• Equivalent Cross Virtual Routing Entry (ICrossVrf)
• Cross Virtual Routing Entry (ICrossVrfRoutingEntry)