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27-2
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 27 IP Tunneling
Feature History for GRE Tunnel IP Source and Destination VRF Membership
The tunnel vrf command is used to configure the Tunnel VRF feature. The VRF specified in the
tunnel
vrf command is the same VRF as the VRF associated with the physical interface over which the
tunnel sends packets. This provides outer IP packet routing.
For more detailed information, see the Generic Routing Encapsulation Tunnel IP Source and Destination
VRF Membership feature module, located at the following URL:
http://www.cisco.com/en/US/products/ps6566/products_feature_guides_list.html
VRF-Aware VPDN Tunnels
The VRF-Aware VPDN Tunnels feature allows you to create VPDN tunnels that use a customer VRF
address from a VRF routing table as the tunnel endpoint. The VPDN tunnel terminates in one VRF and
the associated PPP sessions terminate in a different VRF. For example, VPDN tunnels can start outside
the Multiprotocol Label Switching (MPLS) VPN and terminate within the MPLS VPN.
To configure VRF-Aware VPDN Tunnels, use the vpn command in VPDN configuration mode. This
command specifies that the source and destination IP addresses of a given VPDN group belong to the
specified VRF. Before you enter the vpn command, you must first create the VRF instance using the ip
vrf command. Different VRF-aware VPDN tunnels can have overlapping IP addresses across VRF
instances.
The ip vrf forwarding command, configured in tunnel interface mode, enables VRF forwarding on an
interface. The VRF associated with the tunnel in the ip vrf forwarding command configuration is the
VRF that the packets are to be forwarded in as the packets exit the tunnel. This provides inner IP packet
routing.
The Cisco 10000 series router supports the VRF-Aware VPDN Tunnels feature on the PRE2 and
PRE3and applies to the router when acting as the L2TP access concentrator (LAC) or a Layer 2 network
server (LNS). As a LAC or an LNS, the router can initiate and terminate tunnels within a specified VRF.
For more information, see the VRF-Aware VPDN Tunnels feature module, located at the following URL:
http://www.cisco.com/en/US/products/ps6566/products_feature_guides_list.html
Feature History for GRE Tunnel IP Source and Destination
VRF
Membership
Cisco IOS Release Description Required PRE
12.3(7)XI7 This feature was integrated into Cisco IOS
Release
12.3(7)XI7, enhanced to include domain support,
and implemented on the LAC.
PRE2
12.2(28)SB This feature was integrated in Cisco IOS Release
12.2(28)SB.
PRE2
12.2(31)SB5 This feature was introduced on the PRE3. PRE3
12.2(33)SB Support for VRF-Aware VPDN tunnels feature on LNS PRE3 and PRE4