Reference Guide

1032 | Virtual Routing and Forwarding (VRF)
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Enable VRF
VRF is enabled by default when VRF microcode is loaded on an E-Series ExaScale or TeraScale router.
On an E-Series router, Dell Force10 VRF supports up to 15 VRF instances: 1 to 14 and the default VRF
(0).
A VRF name is not exchanged between routers. VRF IDs are local to a router. The following features and
functionality are supported only on the default VRF (0) instance:
• ISIS
• BGP
• RIP
• IPv6
• Multicast
• Static ARP
Assign an Interface to a VRF
You must enter the ip vrf forwarding 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
ip vrf command.
Task Command Syntax Command Mode
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.
ip vrf vrf-name vrf-id
VRF ID range: 1 to 14 and 0
(default VRF)
CONFIGURATION
Note: Starting in FTOS 8.4.2.1, when VRF microcode is loaded on a E-Series ExaScale or TeraScale
router, the
ip vrf [ default-vlan| vrf-name] command is deprecated, and is replaced by the ip vrf vrf-name
vrf-id command. The ip vrf-vlan-block, start-vlan-id default-vrf, and start-vlan-id vlan-start-id 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.