Handles and processes LDP messages.

The LDP protocol is used by one LSR (Label Switched Router) to inform another LSR of the label bindings it has made. The LSR uses this protocol to establish label switched paths through a network by mapping network layer routing information directly to data-link layer switched paths.

Operations

All LDP message types are subclassed from LdpPacket, and include LdpHello, LdpNotify, LdpLabelRequest, LdpIni and LdpAddress.

Message processing in the Ldp module is explained in LDP Message Processing

Author: Vojta Janota

Inheritance diagram

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

Used in compound modules

Name	Type	Description
LdpMplsRouter	compound module	An LDP-capable router.

Parameters

Name	Type	Default value	Description
interfaceTableModule	string		The path to the InterfaceTable module
routingTableModule	string
libTableModule	string
tedModule	string
holdTime	double	15s
helloInterval	double	5s
stopOperationExtraTime	double	-1s	extra time after lifecycle stop operation finished
stopOperationTimeout	double	2s	timeout value for lifecycle stop operation

Properties

Name	Value	Description
display	i=block/control
lifecycleSupport

Gates

Name	Direction	Size	Description
socketIn	input
socketOut	output

Scheduled messages (observed)

msg	kind	ctrl	tags	msgname	context
omnetpp::cMessage	0			LDPSendHello

Direct method calls (observed)

call to	function	info
MessageDispatcher	inet::MessageDispatcher::arrived	arrived
ScenarioManager	inet::ScenarioManager::moduleOperationStageCompleted	moduleOperationStageCompleted

Called methods (observed)

function	info	call from
inet::Ldp::handleOperationStage	handleOperationStage	ScenarioManager
inet::Ldp::receiveSignal	routeAdded	Ipv4RoutingTable
inet::Ldp::receiveSignal	routeDeleted	Ipv4RoutingTable

Incoming messages (observed)

gate	msg	kind	ctrl	srcModule	tags
socketIn	Indication	2 (UdpStatusInd::UDP_I_SOCKET_CLOSED)	UdpSocketClosedIndication	Udp	SocketInd
socketIn	Indication	6 (TcpStatusInd::TCP_I_CLOSED)	TcpCommand	Tcp	SocketInd

Outgoing messages (observed)

gate	msg	kind	ctrl	destModule	tags
socketOut	Packet	0 (UdpCommandCode::UDP_C_DATA)		Udp	DispatchProtocolReq, L3AddressReq, L4PortReq, SocketReq
socketOut	Request	1 (UdpCommandCode::UDP_C_BIND)	UdpBindCommand	Udp	DispatchProtocolReq, SocketReq
socketOut	Request	2 (TcpCommandCode::TCP_C_OPEN_PASSIVE)	TcpOpenCommand	Tcp	DispatchProtocolReq, SocketReq
socketOut	Request	3 (UdpCommandCode::UDP_C_SETOPTION)	UdpSetMulticastInterfaceCommand	Udp	DispatchProtocolReq, SocketReq
socketOut	Request	3 (UdpCommandCode::UDP_C_SETOPTION)	UdpSetMulticastLoopCommand	Udp	DispatchProtocolReq, SocketReq
socketOut	Request	4 (UdpCommandCode::UDP_C_CLOSE)	UdpCloseCommand	Udp	DispatchProtocolReq, SocketReq
socketOut	Request	5 (TcpCommandCode::TCP_C_CLOSE)	TcpCommand	Tcp	DispatchProtocolReq, SocketReq

Packet operations (observed)

chunkType	packetAction
LdpHello	insertAtBack

Shared Tagging operations (observed)

tagType	tagAction
DispatchProtocolReq	addTagIfAbsent
L3AddressReq	addTagIfAbsent
L4PortReq	addTagIfAbsent
SocketInd	findTag, getTag
SocketReq	addTagIfAbsent

Tagging operations (observed)

tagType	tagAction
inet::Ipv4InterfaceData	findTag

Source code

//
// Handles and processes LDP messages.
//
// The LDP protocol is used by one LSR (Label Switched Router) to inform
// another LSR of the label bindings it has made. The LSR uses this protocol
// to establish label switched paths through a network by mapping network layer
// routing information directly to data-link layer switched paths.
//
// Operations
//
// All LDP message types are subclassed from ~LdpPacket, and include
// ~LdpHello, ~LdpNotify, ~LdpLabelRequest, ~LdpIni and ~LdpAddress.
//
// Message processing in the ~Ldp module is explained in
// <a href="ldp-processing.html">LDP Message Processing</a>
//
// @author Vojta Janota
//
simple Ldp like IApp
{
    parameters:
        string interfaceTableModule;   // The path to the InterfaceTable module
        string routingTableModule;
        string libTableModule;
        string tedModule;
        double holdTime @unit(s) = default(15s);
        double helloInterval @unit(s) = default(5s);
        @display("i=block/control");
        @lifecycleSupport;
        double stopOperationExtraTime @unit(s) = default(-1s);    // extra time after lifecycle stop operation finished
        double stopOperationTimeout @unit(s) = default(2s);    // timeout value for lifecycle stop operation

    gates:
        input socketIn @labels(TcpCommand/up,UdpControlInfo/up);
        output socketOut @labels(TcpCommand/down,UdpControlInfo/down);
}

File: src/inet/networklayer/ldp/Ldp.ned

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