Configuring Vrfs; Configuring A Vpn Routing Session - Cisco Catalyst 3750 Software Configuration Manual

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.
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.

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
Step 1 configure terminal
Step 2
router ospf process-id vrf vrf-name
Catalyst 3750 Metro Switch Software Configuration Guide
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Chapter 28
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 arbitrary 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.
Purpose
Enter global configuration mode.
Enable OSPF routing, specify a VPN forwarding table,
and enter router configuration mode.
Configuring IP Unicast Routing
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