Packet EtherFrame

File: src/linklayer/ethernet/EtherFrame.msg

Common base class for classes representing Ethernet II and 802.3 frame types, containing their common header fields.

This class should never be instantiated by the models, only specific subclasses: EthernetIIFrame, EtherFrameWithLLC and EtherFrameWithSNAP.

Source and destination MAC address are stored in data members. Other fields include:

preamble: not stored (only contributes length)
length: stored in cMessage length, not stored explicitly
payload: stored a encapsulated packet (cMessage::encapsulate())
crc: represented by cMessage::hasBitError()

Usage diagram:

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Inheritance diagram:

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram. Click here to see the full picture.

Known subclasses:

EtherFrameWithLLC (packet)	Ethernet frame with 802.3 LLC header.
EtherFrameWithSNAP (packet)	Ethernet frame with 802.3 LLC and SNAP headers.
EthernetIIFrame (packet)	Ethernet II headers contain a 16-bit EtherType to identify the encapsulated protocol.
EtherPauseFrame (packet)	Ethernet frame used by the PAUSE protocol

Fields:

Name	Type	Description
dest	MACAddress
src	MACAddress	MessageId id; -- uncomment for tracing frames

Source code:

//
// Common base class for classes representing Ethernet II and 802.3 frame types,
// containing their common header fields.
//
// This class should never be instantiated by the models, only specific
// subclasses: EthernetIIFrame, EtherFrameWithLLC and EtherFrameWithSNAP.
//
// Source and destination MAC address are stored in data members.
// Other fields include:
//  - preamble: not stored (only contributes length)
//  - length: stored in cMessage length, not stored explicitly
//  - payload: stored a encapsulated packet (cMessage::encapsulate())
//  - crc: represented by cMessage::hasBitError()
//
packet EtherFrame
{
    MACAddress dest;
    MACAddress src;
        //MessageId id; -- uncomment for tracing frames
}