es.tid.bgp.bgp4.update.fields

Class PathAttribute

java.lang.Object

es.tid.bgp.bgp4.objects.BGP4Object

es.tid.bgp.bgp4.update.fields.PathAttribute

All Implemented Interfaces:

BGP4Element

Direct Known Subclasses:

AS_Path_Attribute, LinkStateAttribute, MP_Reach_Attribute, MP_Unreach_Attribute, Next_Hop_Attribute, OriginAttribute

public abstract class PathAttribute
extends BGP4Object

Path Attributes A variable-length sequence of path attributes is present in every UPDATE message, except for an UPDATE message that carries only the withdrawn routes. Each path attribute is a triple of variable length. Attribute Type is a two-octet field that consists of the Attribute Flags octet, followed by the Attribute Type Code octet.

               0                   1
               0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
               |  Attr. Flags  |Attr. Type Code|
               +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 

If the Extended Length bit of the Attribute Flags octet is set to 0, the third octet of the Path Attribute contains the length of the attribute data in octets. If the Extended Length bit of the Attribute Flags octet is set to 1, the third and fourth octets of the path attribute contain the length of the attribute data in octets.

Author:

pac

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	extendedLengthBit ExtendedLengthBit.
protected static org.slf4j.Logger	log
protected int	mandatoryLength
protected boolean	optionalBit Optional bit.
protected boolean	partialBit Partial Bit.
protected int	pathAttributeLength
protected boolean	transitiveBit Transitive bit.
protected int	typeCode

Fields inherited from class es.tid.bgp.bgp4.objects.BGP4Object

bytes, length

Constructor Summary

Constructors

Constructor and Description
PathAttribute()
PathAttribute(byte[] bytes, int offset)

Method Summary

Modifier and Type	Method and Description
void	encodeHeader()
boolean	equals(Object obj)
static int	getAttibuteTypeCode(byte[] bytes, int offset)
static int	getAttributeLength(byte[] bytes, int offset)
int	getMandatoryLength()
static int	getMandatoryLength(byte[] bytes, int offset)
int	getPathAttributeLength()
int	getTypeCode()
int	hashCode()
protected void	setPathAttributeLength(int pal)
protected void	setTypeCode(int typeCode)

Methods inherited from class es.tid.bgp.bgp4.objects.BGP4Object

getBytes, getLength, setBytes, setLength

Methods inherited from class java.lang.Object

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

Methods inherited from interface es.tid.bgp.bgp4.BGP4Element

encode

Field Detail

log

protected static final org.slf4j.Logger log

typeCode

protected int typeCode

optionalBit

protected boolean optionalBit

Optional bit. The high-order bit (bit 0) of the Attribute Flags octet is the Optional bit. It defines whether the attribute is optional (if set to 1) or well-known (if set to 0).

transitiveBit

protected boolean transitiveBit

Transitive bit. The second high-order bit (bit 1) of the Attribute Flags octet is the Transitive bit. It defines whether an optional attribute is transitive (if set to 1) or non-transitive (if set to 0). For well-known attributes, the Transitive bit MUST be set to 1.

partialBit

protected boolean partialBit

Partial Bit. The third high-order bit (bit 2) of the Attribute Flags octet is the Partial bit. It defines whether the information contained in the optional transitive attribute is partial (if set to 1) or complete (if set to 0). For well-known attributes and for optional non-transitive attributes, the Partial bit MUST be set to 0.

extendedLengthBit

protected boolean extendedLengthBit

ExtendedLengthBit. The fourth high-order bit (bit 3) of the Attribute Flags octet is the Extended Length bit. It defines whether the Attribute Length is one octet (if set to 0) or two octets (if set to 1).

mandatoryLength

protected int mandatoryLength

pathAttributeLength

protected int pathAttributeLength

Constructor Detail

PathAttribute

public PathAttribute()

PathAttribute

public PathAttribute(byte[] bytes,
                     int offset)

Method Detail

encodeHeader

public void encodeHeader()

setPathAttributeLength

protected void setPathAttributeLength(int pal)

getPathAttributeLength

public int getPathAttributeLength()

getMandatoryLength

public int getMandatoryLength()

getAttibuteTypeCode

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

getMandatoryLength

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

getAttributeLength

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

getTypeCode

public int getTypeCode()

setTypeCode

protected void setTypeCode(int typeCode)

hashCode

public int hashCode()

Overrides:

hashCode in class BGP4Object

equals

public boolean equals(Object obj)

Overrides:

equals in class BGP4Object