Administrator Guide

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.
NOTE: To configure a router ID in a non-default VRF, configure at least one IP address in both the default as well as the
non-default VRF.
Table 128. Features Supported in VRF
Feature/Capability Support Status for Default VRF Support Status for Non-default VRF
Configuration rollback for commands
introduced or modified
Yes No
LLDP protocol on the port Yes No
802.1x protocol on the VLAN port Yes No
OSPF, RIP, ISIS, BGP on physical and logical
interfaces
Yes Yes
NOTE: OSPF supported on all VRF
ports. OSPF V2 and BGP V4 are
supported on non-default-VRF
ports also. Others supported only
on default-VRF ports.
Dynamic Port-channel (LACP) on VLAN
port or a Layer 3 port
Yes Yes
Static Port-channel as VLAN port or a Layer
3 port
Yes Yes
Port-monitoring Yes No
BFD on physical and logical interfaces Yes No
PVST, MSTP, RSTP and 802.1D STP for
VLANs
Yes No
FRRP (if applicable) for VLANs Yes No
Multicast protocols (PIM-SM, PIM-DM,
MSDP)
Yes No
Layer 3 (IPv4/IPv6) ACLs, TraceLists, PBR,
QoS on VLANs
Yes Yes
NOTE: ACLs supported on all VRF
VLAN ports. IPv4 ACLs are
supported on non-default-VRFs
also. IPv6 ACLs are supported on
954 Virtual Routing and Forwarding (VRF)