MrpRelay

simple module

Relay unit with support for the Media Redundancy Protocol (MRP), defined in IEC 62439-2.

This module forwards Ethernet frames based on their destination MAC addresses to appropriate ports. It handles frame forwarding in accordance with interface data from both STP and MRP, and blocks traffic if ports are set to BLOCKED. If a frame specific to STP or MRP is received, this frame is processed according to the rules in ~MrpMacForwardingTable, and then forwarded to the appropriate upper layer MRP or STP instance.

<b>See also:</b> ~MrpMacForwardingTable, ~Mrp, ~MrpInterconnection

Inheritance diagram

The following diagram shows inheritance relationships for this type. Unresolved types are missing from the diagram.

Extends

Name	Type	Description
Ieee8021dRelay	simple module	Forwards frames (~EtherFrame) based on their destination MAC addresses to appropriate ports.

Parameters

Name	Type	Default value	Description
displayStringTextFormat	string	"proc: %p\ndisc: %d"	Determines the text that is written on top of the submodule, supports displaying pars, watches, and module-specific information
macTableModule	string
interfaceTableModule	string
switchingDelay	double	truncnormal(8.61us,5.42us)	Switches take a certain amount of time for processing each packet. This parameter sets the processsing delay applied before sending packets out.

Properties

Name	Value	Description
class	MrpRelay
display	i=block/switch

Gates

Name	Direction	Size	Description
lowerLayerIn	input
lowerLayerOut	output
upperLayerIn	input
upperLayerOut	output

Signals

Name	Type	Unit	Description
packetReceivedFromUpper	inet::Packet
packetReceivedFromLower	inet::Packet
packetDropped	inet::Packet
packetSentToLower	inet::Packet

Statistics

Name	Title	Source	Record	Unit	Interpolation Mode	Description
packetDropped	packets dropped		count, sum(packetBytes), vector(packetBytes)		none

Source code

//
// Relay unit with support for the Media Redundancy Protocol (MRP), defined
// in IEC 62439-2.
//
// This module forwards Ethernet frames based on their destination MAC addresses
// to appropriate ports. It handles frame forwarding in accordance with
// interface data from both STP and MRP, and blocks traffic if ports are set to
// BLOCKED. If a frame specific to STP or MRP is received, this frame is
// processed according to the rules in ~MrpMacForwardingTable, and then
// forwarded to the appropriate upper layer MRP or STP instance.
//
// @see ~MrpMacForwardingTable, ~Mrp, ~MrpInterconnection
//
simple MrpRelay extends Ieee8021dRelay like IMacRelayUnit
{
    parameters:
        @class(MrpRelay);

        // Switches take a certain amount of time for processing each packet.
        // This parameter sets the processsing delay applied before sending
        // packets out.
        volatile double switchingDelay @unit(s) = default(truncnormal(8.61us,5.42us));
}

File: src/inet/linklayer/mrp/MrpRelay.ned