Packet EtherAutoconfig

File: src/linklayer/ethernet/EtherFrame.msg

Ethernet model components (EtherMAC, EtherHub and EtherBus) send this message at the beginning of the simulation, so that "auto"-valued "txrate" and "duplex" parameters of EtherMAC can be initialized. The purpose is similar to Ethernet Auto-Negotiation; however this is NOT meant to be the model of that Ethernet feature. (For example, EtherBus also sends an EtherAutoconfig message in the model, which obviously does not happen in a real Ethernet.)

txrate: EtherMAC with non-auto txrate send configured txrate value; EtherBus sends 10Mbps (0 means not set). Lowest value will be chosen by all EtherMACs, or if no txrate was advertised (all were 0), 100Mbps is chosen.
halfDuplex: EtherHub, EtherBus, plus EtherMAC with duplexEnabled=false setting send true. Duplex operation only chosen by a MAC if nobody vetoed it by sending halfDuplex=true.

Usage diagram:

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Inheritance diagram:

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Fields:

Name	Type	Description
txrate	double
halfDuplex	bool

Source code:

//
// Ethernet model components (EtherMAC, EtherHub and EtherBus) send this
// message at the beginning of the simulation, so that "auto"-valued "txrate"
// and "duplex" parameters of EtherMAC can be initialized. The purpose is
// similar to Ethernet Auto-Negotiation; however this is NOT meant to be
// the model of that Ethernet feature. (For example, EtherBus also sends
// an EtherAutoconfig message in the model, which obviously does not happen in
// a real Ethernet.)
//
// - txrate: EtherMAC with non-auto txrate send configured txrate value;
//   EtherBus sends 10Mbps (0 means not set). Lowest value will be chosen by
//   all EtherMACs, or if no txrate was advertised (all were 0), 100Mbps is chosen.
// - halfDuplex: EtherHub, EtherBus, plus EtherMAC with duplexEnabled=false setting
//   send true. Duplex operation only chosen by a MAC if nobody vetoed it by sending
//   halfDuplex=true.
//
packet EtherAutoconfig
{
    double txrate = 0;
    bool halfDuplex = false;
}