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7.9.7. VRF Configuration Example
1. Create virtual router instances. The following commands create and name two instances and enter VRF
Configuration mode for each.
In VRF Configuration mode for each VR, a description is added and the maximum number of routes allowed in
each virtual instance is configured. On the “Red” instance, the number of routes above which a warning
message is issued is also configured.
The ip routing command enables routing in each VR instance:
(Switch) #configure
(Switch) (Config)#ip vrf Red
(Switch) (Config-vrf-Red)#description "finance department" (Switch) (Config-vrf-Red)#maximum
routes 2048
(Switch) (Config-vrf-Red)#maximum routes warn 80 (Switch) (Config-vrf-Red)#ip routing
(Switch) (Config-vrf-Red)#exit
(Switch) (Config)#ip vrf Blue
(Switch) (Config-vrf-Blue)#description "human resources department" (Switch) (Config-vrf-
Blue)#maximum routes 4096
(Switch) (Config-vrf-Blue)#ip routing
(Switch) (Config-vrf-Blue)#exit
2. In Interface Config mode, assign interfaces to each virtual router:
(Switch) (Config)#interface 0/1
(Switch) (Interface 1/0/1)#ip vrf forwarding Red
Warning: routing interface moved from Default router instance to "Red" router instance.
(Switch) (Interface 1/0/1)#exit
(Switch) (Config)#interface 0/2
(Switch) (Interface 1/0/2)#ip vrf forwarding Blue
Warning: routing interface moved from Default router instance to "Blue" router instance.
(Switch) (Interface 1/0/2)#exit
3. Create static leaked routes as needed in the VR
instances.
In the following example, subnetwork 9.0.0.0/24 is a connected subnetwork in the global route table and
subnet 56.6.6.0/24 is reachable via a gateway 9.0.0.2 in the global route table. Subnet 8.0.0.0/24 is a
connected subnetwork in virtual router Red.
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