The traffic flow illustrated by and is as follows:
The following sections describe: Layer-3 Tunnel Traffic Flow modes supported are IPv4 encapsulated in IPv4 and IPv6 encapsulated in IPv6.
GRE is an IP encapsulation protocol that is used to transport packets over a network.
The only Layer-3 GRE Generic Routing Encapsulation. IPv6 encapsulated in IPv4 and IPv4 encapsulated in IPv6 are not supported.
