Cisco Cisco IOS Software Release 12.2(27)SBC

The ability to use VRF addresses for destination and source addresses matches current network design. 
For instance, Internet service providers (ISPs) support VRF and have one VRF routing table per 
customer. The VRF-Aware VPDN Tunnels features allows for the creation of VPDN tunnels that use the 
customer VRF address as the tunnel endpoint.

You can configure VRF-aware VPDN tunnels either in a local VPDN group or by updating the RADIUS 
server profile definitions for VPDN tunnel attributes. This section contains the following tasks:

To configure VRF-Aware VPDN Tunnels locally, perform these steps.

vpdn-group name

protocol [l2f | l2tp| pptp]

domain domain-name

vpn {vrf vrf-name | id vpn-id}

source-ip ip-address

initiate-to ip ip-address [limit limit-number] [priority priority-number]

For Cisco IOS Release 12.2(31)SB5 and later releases, when configuring VRF-aware VPDN tunnels on 
the Cisco 10000 series router, different tunnels can have overlapping IP addresses across VRF instances.