VRF group in L3VPN traffic

To support mid-stream routing, VRF undergoes changes for processing a session among a group of MPLS VRF instances in an L3VPN MPLS network. These VRF instances which are logically part of a given L3VPN traffic route are grouped into a VRF group. The VRF groups allows the session to switch from one MPLS VRF to another MPLS VRF. 

VRF group supports the following features: 

• Overlapping in VPN session 
• VRF group Policy 
• VRF group NAT 
• VRF group ALG