3. Repeat the previous step on the corresponding interface on the peer device.
Conguring a VRF instance
Do the following to congure a VRF instance.
A device can be congured with more than one VRF instance. You should dene each VRF instance before assigning the VRF to a Layer
3 interface. The range of the instance name is from 1 through 255 alphanumeric characters. Each VRF instance is identied by a unique
Route Distinguisher (RD), which is prepended to the address being advertised. Because the RD provides overlapping client address
space with a unique identier, the same IP address can be used for dierent VRFs without conict. The RD can be an AS number,
followed by a colon (:) and a unique arbitrary number as shown below. Alternatively, it can be a local IP address followed by a colon (:) and
a unique arbitrary number, as in "1.1.1.1:100." An optional router ID can also be assigned.
Use the address-family command in VRF conguration mode to specify an IPv4 or IPv6 address family. For a specic address family
you can also congure static route, static ARP, IGMP, and multicast for IPv4, and static route, IPv6 neighbor, and multicast for IPv6.
ATTENTION
Using the overwrite option while downloading a conguration from a TFTP server to the running-cong will lead to the loss of
all VRF congurations when a VRF is congured on a routing interface.
1. (Optional) Assign a Route Distinguisher (RD).
device(config-vrf-corporate)# rd 11:11
2. (Optional) Assign a router ID.
device(config-vrf-corporate)# ip router-id 1.1.1.1
3. Use the address-family unicast (VRF) command to
congure an address family on the VRF and exit. This example uses IPv4.
device(config-vrf-corporate)# address-family ipv4 unicast
device(config-vrf-corporate-ipv4)# exit
4. Verify the conguration.
device(config-vrf-corporate)# do show vrf
Total number of VRFs configured: 2
Status Codes - A:active, D:pending deletion, I:inactive
Name Default RD vrf|v4|v6 Routes Interfaces
corporate 11:11 A | A| I 0
guest 10:10 A | A| I 0
Total number of IPv4 unicast route for all non-default VRF is 0
Total number of IPv6 unicast route for all non-default VRF is 0
Starting a routing process for a VRF
You must enable a routing protocol for each VRF instance. This example uses OSPF.
1. In global
conguration mode, enable OSPF for the VRF instance "corporate."
device(config)# router ospf vrf corporate
2. Congure the VRF to use OSPF Area 0.
device(config-ospf-router-vrf-corporate)# area 0
Conguring Multi-VRF
FastIron Ethernet Switch Layer 3 Routing
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