es.tid.pce.pcep.constructs

Class GeneralizedBandwidth

java.lang.Object

es.tid.pce.pcep.constructs.PCEPConstruct

es.tid.pce.pcep.constructs.GeneralizedBandwidth

All Implemented Interfaces:

PCEPElement

Direct Known Subclasses:

GeneralizedBandwidthSSON

public abstract class GeneralizedBandwidth
extends PCEPConstruct

Generalized Bandwidth Construct.

Represents a PCEP GENERALIZED-BANDWIDTH as defined in PCEP extensions for GMPLS draft-ietf-pce-gmpls-pcep-extensions-04

From PCEP extensions for GMPLS draft-ietf-pce-gmpls-pcep-extensions-04 Section 2.2. Traffic Parameters encoding, GENERALIZED-BANDWIDTH Object:

The PCEP BANDWIDTH does not describe the details of the signal (for example NVC, multiplier), hence the bandwidth information should be extended to use the RSVP Tspec object encoding. The PCEP BANDWIDTH object defines two types: 1 and 2. C-Type 2 is representing the existing bandwidth in case of re-optimization.

The following possibilities cannot be represented in the BANDWIDTH object:

  o  Asymmetric bandwidth (different bandwidth in forward and reverse
     direction), as described in [RFC6387]

  o  GMPLS (SDH/SONET, G.709, ATM, MEF etc) parameters are not
     supported.
  

This correspond to requirement 3,4,5 and 10 of [I-D.ietf-pce-gmpls-aps-req].

According to [RFC5440] the BANDWIDTH object has no TLV and has a fixed size of 4 bytes. This definition does not allow extending it with the required information. To express this information, a new object named GENERALIZED-BANDWIDTH having the following format is defined:

  
    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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    Bandwidth Spec Length      | Rev. Bandwidth Spec Length    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      | Bw Spec Type  |   Reserved                                    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                     generalized bandwidth                     ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~          Optional : reverse generalized bandwidth             ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                       Optional TLVs                           ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  
  
      0                   1                   2                   3
       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
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |   Traffic Spec Length         | TSpec Type    | Reserved  |R|O|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                       Traffic Spec                            ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      ~                       Optional TLVs                           ~
      |                                                               |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  The GENERALIZED-BANDWIDTH has a variable length.  The Traffic spec
  length field indicates the length of the Traffic spec field.  The
  bits R and O have the following meaning:

     O bit : when set the value refers to the previous bandwidth in
     case of re-optimization

     R bit : when set the value refers to the bandwidth of the reverse
     direction

  The Object type determines which type of bandwidth is represented by
  the object.  The following object types are defined:

  1.  Intserv

  2.  SONET/SDH

  3.  G.709

  4.  Ethernet
  
  5.    SSON

  The encoding of the field Traffic Spec is the same as in RSVP-TE, it
  can be found in the following references.
  
                     Object Type Name      Reference

                     0           Reserved

                     1           Reserved

                     2           Intserv   [RFC2210]

                     3           Reserved

                     4           SONET/SDH [RFC4606]

                     5           G.709     [RFC4328]

                     6           Ethernet  [RFC6003]

                       Traffic Spec field encoding
 

The GENERALIZED-BANDWIDTH MAY appear more than once in a PCReq message. If more than one GENERALIZED-BANDWIDTH have the same Object Type, Reserved, R and O values, only the first one is processed, the others are ignored.

a PCE MAY ignore GENERALIZED-BANDWIDTH objects, a PCC that requires a GENERALIZED-BANDWIDTH to be used can set the P (Processing) bit in the object header.

When a PCC needs to get a bi-directional path with asymmetric bandwidth, it SHOULD specify the different bandwidth in forward and reverse directions through two separate GENERALIZED-BANDWIDTH objects. If the PCC set the P bit on both object the PCE MUST compute a path that satisfies the asymmetric bandwidth constraint and return the path to PCC if the path computation is successful. If the P bit on the reverse GENERALIZED-BANDWIDTH object the PCE MAY ignore this constraint.

a PCE MAY include the GENERALIZED-BANDWIDTH objects in the response to indicate the GENERALIZED-BANDWIDTH of the path

Optional TLVs may be included within the object body to specify more specific bandwidth requirements. The specification of such TLVs is outside the scope of this document.

GENERALIZED_BANDWIDTH Object Class = 155

Author:

amll

Field Summary

Fields inherited from class es.tid.pce.pcep.constructs.PCEPConstruct

bytes, length, log

Constructor Summary

Constructors

Constructor and Description
GeneralizedBandwidth() Constructs a GeneralizedBandwidth object
GeneralizedBandwidth(byte[] bytes, int offset)

Method Summary

Modifier and Type	Method and Description
void	decode(byte[] bytes, int offset)
boolean	equals(Object obj)
int	getBwSpecType()
int	hashCode()
void	setBwSpecType(int bwSpecType)

Methods inherited from class es.tid.pce.pcep.constructs.PCEPConstruct

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.pce.pcep.PCEPElement

encode

Constructor Detail

GeneralizedBandwidth

public GeneralizedBandwidth()

Constructs a GeneralizedBandwidth object

GeneralizedBandwidth

public GeneralizedBandwidth(byte[] bytes,
                            int offset)

Method Detail

getBwSpecType

public int getBwSpecType()

setBwSpecType

public void setBwSpecType(int bwSpecType)

decode

public void decode(byte[] bytes,
                   int offset)

hashCode

public int hashCode()

Overrides:

hashCode in class PCEPConstruct

equals

public boolean equals(Object obj)

Overrides:

equals in class PCEPConstruct