Users Guide

Figure 150. VRF Network Example
VRF Configuration Notes
Although there is no restriction on the number of VLANs that can be assigned to a VRF instance, the total number of routes supported in
VRF is limited by the size of the IPv4 CAM.
VRF is implemented in a network device by using Forwarding Information Bases (FIBs).
A network device may have the ability to configure different virtual routers, where entries in the FIB that belong to one VRF cannot be
accessed by another VRF on the same device. Only Layer 3 interfaces can belong to a VRF. VRF is supported on following types of
interface:
• Physical Ethernet interfaces
• Port-channel interfaces (static & dynamic using LACP)
• VLAN interfaces
• Loopback interfaces
VRF supports route redistribution between routing protocols (including static routes) only when the routes are within the same VRF.
Dell Networking OS uses both the VRF name and VRF ID to manage VRF instances. The VRF name and VRF ID number are assigned using
the ip vrf command. The VRF ID is displayed in show ip vrf command output.
The VRF ID is not exchanged between routers. VRF IDs are local to a router.
VRF supports some routing protocols only on the default VRF (default-vrf) instance. Table 1 displays the software features supported in
VRF and whether they are supported on all VRF instances or only the default VRF.
Virtual Routing and Forwarding (VRF)
879