Unidirectional GRE tunnels across IPv4 without tunnel interfaces

You can configure a tunnel that transports IPv4, IPv6, protocol-independent, or MPLS traffic across an IPv4 network without having to create tunnel interfaces on services PICs. This type of GRE tunnel is unidirectional and transports unicast or multicast transit traffic as clear text. Encapsulation, de-encapsulation, and forwarding of payloads is executed by Packet Forwarding Engine processes for logical Ethernet interfaces or aggregated Ethernet interfaces hosted on MICs and MPCs in MX Series routers. Two MX Series routers installed as PE routers provide network connectivity to two CE routers that lack a native routing path between them. This feature is also supported in logical systems.