NED File src/inet/networklayer/mpls/Mpls.ned
Name | Type | Description |
---|---|---|
Mpls | simple module |
Implements the MPLS protocol. |
Source code
// // Copyright (C) 2005 Vojtech Janota // Copyright (C) 2003 Xuan Thang Nguyen // // SPDX-License-Identifier: LGPL-3.0-or-later // package inet.networklayer.mpls; import inet.protocolelement.contract.IProtocolLayer; // // Implements the MPLS protocol. // // ~Mpls module is added between layer 2 and 3 in the OSI model for fast packet // switching. ~Mpls should be transparent to signalling protocols. Signalling // protocol currently implemented in this simulation is RSVP-TE. // // Operations // // MPLS packets are represented by the MplsPacket class. // The local LIB (Label Information Base) is stored in a ~LibTable module // in the LSR. // // For most of the time, the ~Mpls module will do the label swapping and // message forwarding. Upon receiving a labelled packet from another LSR, the // ~Mpls first extract the incoming interface and incoming label pair, and then // look up the local LIB table. If an outgoing label and an outgoing interface // can be found, the module will perform appropriate label operations (PUSH, // POP, SWAP) based on the "outLabel" vector containing label and operation // pairs. // // Collaborations // // ~Mpls module is required to interact with L2 (Link Layer) and L3 (Network // Layer) in the OSI model. In addition, it needs to obtain label information // from the LIB component and label query result from the ~Ldp module. Messages // the model communicates with L2 and Network Layers are L2 packets (PPP, // Frame Relay, ATM, Ethernet, etc.), and IP native packets. Specifically, // ~Mpls module encapsulates IP packet and is encapsulated in L2 packet. // Different L2 protocols may require different methods of encapsulation to // inherit the L2's QoS. This implementation follows a generic approach; it // assumes no information of QoS from the link layer. // simple Mpls like IProtocolLayer { parameters: string interfaceTableModule; // The path to the InterfaceTable module string libTableModule; string classifierModule; // The path to the module which implements the IIngressClassifier C++ interface @display("i=block/switch"); gates: input upperLayerIn; output upperLayerOut; input lowerLayerIn; output lowerLayerOut; }