es.tid.ospf.ospfv2.lsa

Class LSA

java.lang.Object

es.tid.ospf.ospfv2.lsa.LSA

Direct Known Subclasses:

OpaqueLSA

public abstract class LSA
extends Object

Base class for OSPF v2 LSA (Link State Advertisement) messages, See RFC 2328.

All LSAs begin with a common 20 byte header. This header contains enough information to uniquely identify the LSA (LS type, Link State ID, and Advertising Router). Multiple instances of the LSA may exist in the routing domain at the same time. It is then necessary to determine which instance is more recent. This is accomplished by examining the LS age, LS sequence number and LS checksum fields that are also contained in the LSA header.

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |            LS age             |    Options    |    LS type    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Link State ID                          |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     Advertising Router                        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                     LS sequence number                        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |         LS checksum           |             length            |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Author:

ogondio

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	log The logger
protected byte[]	LSAbytes Bytes of the LSA

Constructor Summary

Constructors

Constructor and Description
LSA() Default constructor
LSA(byte[] bytes, int offset) Decodes the header of a LSA

Method Summary

Modifier and Type	Method and Description
abstract void	encode()
void	encodeLSAHeader()
boolean	equals(Object LSAToCompare) Compare LSA by LStype
Inet4Address	getAdvertisingRouter()
int	getChecksum()
int	getLength()
Inet4Address	getLinkStateId()
byte[]	getLSAbytes()
int	getLSage()
static int	getLSlength(byte[] bytes, int offset)
int	getLSsequenceNumber()
int	getLStype()
static int	getLStype(byte[] bytes, int offset)
int	getOptions()
String	printHeader()
void	setAdvertisingRouter(Inet4Address advertisingRouter)
protected void	setLength(int length)
void	setLinkStateId(Inet4Address linkStateId)
void	setLSage(int lSage)
void	setLSsequenceNumber(int lSsequenceNumber)
void	setLStype(int lStype)
void	setOptions(int options)

Methods inherited from class java.lang.Object

clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LSAbytes

protected byte[] LSAbytes

Bytes of the LSA

log

protected static final org.slf4j.Logger log

The logger

Constructor Detail

LSA

public LSA()

Default constructor

LSA

public LSA(byte[] bytes,
           int offset)
    throws MalformedOSPFLSAException

Decodes the header of a LSA

Parameters:

bytes -

offset -

Throws:

MalformedOSPFLSAException

Method Detail

encodeLSAHeader

public void encodeLSAHeader()

getLSage

public int getLSage()

setLSage

public void setLSage(int lSage)

getOptions

public int getOptions()

setOptions

public void setOptions(int options)

getLStype

public int getLStype()

setLStype

public void setLStype(int lStype)

getLinkStateId

public Inet4Address getLinkStateId()

setLinkStateId

public void setLinkStateId(Inet4Address linkStateId)

getAdvertisingRouter

public Inet4Address getAdvertisingRouter()

setAdvertisingRouter

public void setAdvertisingRouter(Inet4Address advertisingRouter)

getLSsequenceNumber

public int getLSsequenceNumber()

setLSsequenceNumber

public void setLSsequenceNumber(int lSsequenceNumber)

getLength

public int getLength()

setLength

protected void setLength(int length)

getLStype

public static int getLStype(byte[] bytes,
                            int offset)

getLSlength

public static int getLSlength(byte[] bytes,
                              int offset)

getLSAbytes

public byte[] getLSAbytes()

getChecksum

public int getChecksum()

encode

public abstract void encode()

equals

public boolean equals(Object LSAToCompare)

Compare LSA by LStype

Overrides:

equals in class Object

printHeader

public String printHeader()