Configuring Vrfs - Cisco Catalyst 3550 series Software Configuration Manual

Chapter 31 Configuring IP Unicast Routing
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Configuring VRFs

Beginning in privileged EXEC mode, follow these steps to configure one or more VRFs. For complete
syntax and usage information for the commands, refer to the switch command reference for this release
and the Cisco IOS Switching Services Command Reference for Release 12.1.
Command
Step 1 configure terminal
Step 2 ip routing
Step 3
ip vrf vrf-name
Step 4
rd route-distinguisher
Step 5
route-target {export | import | both}
route-target-ext-community
Step 6
import map route-map
Step 7
interface interface-id
Step 8
ip vrf forwarding vrf-name
Step 9
end
Step 10 show ip vrf [brief | detail | interfaces]
[vrf-name]
Step 11 copy running-config startup-config
Use the no ip vrf vrf-name global configuration command to delete a VRF and to remove all interfaces
from it. Use the no ip vrf forwarding interface configuration command to remove an interface from the
VRF.
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You cannot configure the Web Cache Communication Protocol (WCCP) and multi-VRF CE on the
same switch at the same time.
When multi-VRF CE is configured, you cannot assign the same Hot Standby Routing Protocol
(HSRP) standby address to two different VPNs.
VRF and policy-based routing (PBR) are mutually-exclusive on a switch interface. You cannot
enable VRF when PBR is enabled on an interface. In contrast, you cannot enable PBR when VRF is
enabled on an interface.
Purpose
Enter global configuration mode.
Enable IP routing.
Name the VRF, and enter VRF configuration mode.
Create a VRF table by specifying a route distinguisher.
Enter either an AS number and an arbitrary number
(xxx:y) or an IP address and abitrary number (A.B.C.D:y)
Create a list of import, export, or import and export route
target communities for the specified VRF. Enter either an
AS system number and an arbitrary number (xxx:y) or an
IP address and an arbitrary number (A.B.C.D:y). The
route-target-ext-community should be the same as the
route-distinguisher entered in Step 4.
(Optional) Associate a route map with the VRF.
Enter interface configuration mode and specify the Layer
3 interface to be associated with the VRF. The interface
can be a routed port or SVI.
Associate the VRF with the Layer 3 interface.
Return to privileged EXEC mode.
Verify the configuration. Display information about the
configured VRFs.
(Optional) Save your entries in the configuration file.
Catalyst 3550 Multilayer Switch Software Configuration Guide
Configuring Multi-VRF CE
31-69