Packet BPDU

File: src/inet/linklayer/ieee8021d/common/Ieee8021dBPDU.msg

C++ definition

Represents a BPDU (Bridge PDU) used by the STP and RSTP protocols, as defined in the 802.1D-1998 specification.

Usage diagram:

The following diagram shows usage relationships between types. Unresolved types are missing from the diagram.

Inheritance diagram:

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

Fields:

Name	Type	Description
byteLength
protocolIdentifier	unsigned int	0 for STP, 1 for RSTP (TODO use them)
protocolVersionIdentifier	unsigned int	currently 0
bpduType	unsigned int	0 for Configuration BPDU, 1 for Topology Change Notification BPDU
tcaFlag	bool	Topology Change Acknowledgment flag
tcFlag	bool	Topology Change flag
rootAddress	MACAddress	address of the tree root (first part of Root Identifier)
rootPriority	unsigned int	priority of the tree root (second part of Root Identifier)
rootPathCost	unsigned int	cost to the root
bridgeAddress	MACAddress	address of sender bridge (first part of Bridge Identifier)
bridgePriority	unsigned int	priority of sender bridge (second part of Bridge Identifier)
portNum	unsigned int	port number (ethg[] gate index) of sender port (first part of Port Identifier)
portPriority	unsigned int	priority of sender port (second part of Port Identifier)
messageAge	simtime_t	Message Age in seconds
maxAge	simtime_t	maximum lifetime of the BPDU (seconds)
helloTime	simtime_t	Hello Time of the sender bridge
forwardDelay	simtime_t	Forward Delay timer of the sender bridge

Source code:

//
// Represents a BPDU (Bridge PDU) used by the STP and RSTP protocols,
// as defined in the 802.1D-1998 specification.
//
packet BPDU
{
    byteLength = 35;
    unsigned int protocolIdentifier;          // 0 for STP, 1 for RSTP (TODO use them)
    unsigned int protocolVersionIdentifier;   // currently 0

    unsigned int bpduType;                    // 0 for Configuration BPDU, 1 for Topology Change Notification BPDU
    bool tcaFlag;                             // Topology Change Acknowledgment flag
    bool tcFlag;                              // Topology Change flag

    MACAddress rootAddress;                   // address of the tree root (first part of Root Identifier)
    unsigned int rootPriority;                // priority of the tree root (second part of Root Identifier)
    unsigned int rootPathCost;                // cost to the root

    MACAddress bridgeAddress;                 // address of sender bridge (first part of Bridge Identifier)
    unsigned int bridgePriority;              // priority of sender bridge (second part of Bridge Identifier)

    unsigned int portNum;                     // port number (ethg[] gate index) of sender port (first part of Port Identifier)
    unsigned int portPriority;                // priority of sender port (second part of Port Identifier)

    simtime_t messageAge;                     // Message Age in seconds
    simtime_t maxAge;                         // maximum lifetime of the BPDU (seconds)
    simtime_t helloTime;                      // Hello Time of the sender bridge
    simtime_t forwardDelay;                   // Forward Delay timer of the sender bridge
}