EdgeMarc now supports GRE access over WAN Ethernet connection. GRE is a tunneling protocol that encapsulates other protocols and routes them over IP networks. GRE uses IP as the Transport Protocol and is used to carry many different Passenger Protocols. The tunnels behave as virtual point-to-point links that have two endpoints – the tunnel source and the tunnel destination.

You can encapsulate and route multiple protocols over a GRE tunnel.

Configuring a GRE involves creating a tunnel interface, which is a logical interface. You must then configure the tunnel endpoints for the tunnel interface.

On EdgeMarc, the primary WAN interface runs BGP and the secondary WAN interface runs GRE. The GRE tunnel is used to route data traffic, only when BGP fails on the primary interface. To implement IPv4 GRE on your EdgeMarc, you must first set static IP addresses on your primary and secondary WAN link interfaces (see Prerequisites), configure BGP on the primary WAN interface (see Configure BGP on Primary Interface), configure GRE on the secondary WAN interface and finally initialize route monitoring to detect BGP failure if it occurs (see Configure GRE Parameters).

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