Generic Routing Encapsulation

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Generic Routing Encapsulation

(networking, protocol)
(GRE) A protocol which allows an arbitrary network protocol A to be transmitted over any other arbitrary network protocol B, by encapsulating the packets of A within GRE packets, which in turn are contained within packets of B.

Defined in RFC 1701 and RFC 1702 (GRE over IP).


(Generic Routing Encapsulation) A tunneling protocol developed by Cisco that allows network layer packets to contain packets from a different protocol. It is widely used to tunnel protocols inside IP packets for virtual private networks (VPNs). For example, the point-to-point tunneling protocol (PPTP) is based on GRE, and GRE is used with IPsec to transmit routing protocol data from one router to another, which IPsec does not natively support. See tunneling protocol, PPTP and IPsec.
References in periodicals archive ?
The company has been a leader in testing, implementing and trialing GMPLS protocols such as Open Shortest Path First--TE, Link Management Protocol (LMP) and Generic Routing Encapsulation (GRE).
The 800 series includes advanced secure access features such as firewall, router/route authentication, Lock and Key, generic routing encapsulation (GRE), access control lists and encryption.
Due to a shortage of networking equipment, we found a way to reduce the equipment requirements of this ADN by removing the SIPR and CX-I routers and terminating the Generic Routing Encapsulation Tunnel on the Layer 3 enable switch.

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