DELL S50V User Manual

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Virtual Routing and Forwarding (VRF)

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You must enter the 

command before you configure the IP address or any other setting on 

an interface. 

When you assign a VLAN interface to a VRF instance, the following conditions apply:

•

VLANs assigned to the same VRF have the same MAC address. VLANs assigned to different VRFs 
have different MAC addresses. The last four bits of a VLAN’s MAC address correspond to the VRF 
ID configured with the 

command. 

•

On a switch port on which multiple VLANs are assigned to different VRFs, the source MAC address 
in packets routed on a VRF may not be the same as the MAC address distributed in ARP requests. As 
a result, security applications running on neighboring routers that check the source MAC address in 
incoming packets may find that the address does not match the ARP-learned MAC address.

•

You can assign a static ARP only to a VLAN that is mapped to the default VRF (0) instance.

•

By default, all VLANs (4096) are associated with the default VRF until you reassign them to a 
non-default VRF with the 

 command. You can assign up to 4096 VLANs to a 

non-default VRF instance.

•

VLANs used with VRF must be Layer 3 VLANs. Layer 2 VLANs can be configured for non-VRF use. 
Refer to 

•

All VLAN member ports must be removed from a VLAN that you move from one VRF instance to 
another.

Create a non-default VRF instance by 
specifying a name and VRF ID number, and 
enter VRF configuration mode.
The default VRF 0 is automatically configured 
when a router with VRF loaded in CAM boots 
up.

VRF ID range: 1 to 14 and 0 (default 
VRF)

CONFIGURATION

Starting in FTOS 8.4.2.1, when VRF microcode is loaded on a E-Series ExaScale or TeraScale 

router, the 

[

command is deprecated, and is replaced by the 

command. The 

, 

, and 

commands are 

also deprecated.

Note: Starting in release 8.4.1.0, you can configure an IP address or subnet on a physical or VLAN 
interface that overlaps the same IP address or subnet configured on another interface only if the 
interfaces are assigned to different VRFs. If two interfaces are assigned to the same VRF, you cannot 
configure overlapping IP subnets or the same IP address on them.

Assign an interface to a VRF instance.

INTERFACE