This feature enables the tunnel interfaces on the SAND platforms to perform filtering based on all options provided by DMF. 

This document describes the L2GRE feature for Jericho switches. L2GRE tunnel support for DMF enables virtual connectivity when the DMF fabric lacks physical connectivity to either the production network, tool devices, or both. It does so by tunneling traffic from the production network to the DMF fabric or from the DMF fabric to tool devices. Using tunnels as core links enables virtual connectivity where the DMF fabric is not physically connected.