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Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 28 Configuring IP Unicast Routing
Configuring Multi-VRF CE
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.
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.
Configuring a VPN Routing Session
Routing within the VPN can be configured with any supported routing protocol (RIP, OSPF, IGRP,
EIGRP, IS-IS or BGP) or with static routing. The configuration shown here is for OSPF, but the process
is the same for other protocols.
Beginning in privileged EXEC mode, follow these steps to configure OSPF in the VPN:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip routing Enable IP routing.
Step 3
ip vrf vrf-name Name the VRF, and enter VRF configuration mode.
Step 4
rd route-distinguisher 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 arbitrary number (A.B.C.D:y)
Step 5
route-target {export | import | both}
route-target-ext-community
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.
Step 6
import map route-map (Optional) Associate a route map with the VRF.
Step 7
interface interface-id 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.
Step 8
ip vrf forwarding vrf-name Associate the VRF with the Layer 3 interface.
Step 9
end Return to privileged EXEC mode.
Step 10
show ip vrf [brief | detail | interfaces]
[vrf-name]
Verify the configuration. Display information about the
configured VRFs.
Step 11
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
router ospf process-id vrf vrf-name Enable OSPF routing, specify a VPN forwarding table,
and enter router configuration mode.
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