es.tid.ospf.ospfv2.lsa

Class OpaqueLSA

java.lang.Object

es.tid.ospf.ospfv2.lsa.LSA

es.tid.ospf.ospfv2.lsa.OpaqueLSA

Direct Known Subclasses:

InterASTEv2LSA, OSPFTEv2LSA

public abstract class OpaqueLSA
extends LSA

Opaque LSA ( RFC 5250).

Opaque LSAs provide a generalized mechanism to allow for the future extensibility of OSPF. The information contained in Opaque LSAs may be used directly by OSPF or indirectly by some application wishing to distribute information throughout the OSPF domain. The exact use of Opaque LSAs is beyond the scope of this document.

Opaque LSAs consist of a standard LSA header followed by a 32-bit aligned application-specific information field. Like any other LSA, the Opaque LSA uses the link-state database distribution mechanism for flooding this information throughout the topology. The link- state type field of the Opaque LSA identifies the LSA's range of topological distribution. This range is referred to as the flooding scope.

It is envisioned that an implementation of the Opaque option provides an application interface for 1) encapsulating application-specific information in a specific Opaque type, 2) sending and receiving application-specific information, and 3) if required, informing the application of the change in validity of previously received information when topological changes are detected.

Opaque LSAs are types 9, 10, and 11 link state advertisements. Opaque LSAs consist of a standard LSA header followed by a 32-bit aligned application-specific information field. Standard link-state database flooding mechanisms are used for distribution of Opaque LSAs. The range of topological distribution (i.e., the flooding scope) of an Opaque LSA is identified by its link-state type. This section documents the flooding of Opaque LSAs.

The flooding scope associated with each Opaque link-state type is defined as follows.

• Link-state type-9 denotes a link-local scope. Type-9 Opaque LSAs are not flooded beyond the local (sub)network.
• Link-state type-10 denotes an area-local scope. Type-10 Opaque LSAs are not flooded beyond the borders of their associated area.
• Link-state type-11 denotes that the LSA is flooded throughout the Autonomous System (AS). The flooding scope of type-11 LSAs are equivalent to the flooding scope of AS-External (type-5) LSAs. Specifically, type-11 Opaque LSAs are 1) flooded throughout all transit areas, 2) not flooded into stub areas or Not-So-Stubby Areas (NSSAs), see [NSSA], from the backbone, and 3) not originated by routers into their connected stub areas or NSSAs. As with type-5 LSAs, if a type-11 Opaque LSA is received in a stub area or NSSA from a neighboring router within the stub area or NSSA, the LSA is rejected.

The link-state ID of the Opaque LSA is divided into an Opaque type field (the first 8 bits) and a type-specific ID (the remaining 24 bits).

     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   |  9, 10, or 11 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Opaque Type  |               Opaque ID                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Advertising Router                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      LS Sequence Number                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |         LS checksum           |           Length              |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                                                               |
      +                                                               +
      |                      Opaque Information                       |
      +                                                               +
      |                              ...                              |
   

Author:

ogondio

Field Summary

Fields inherited from class es.tid.ospf.ospfv2.lsa.LSA

log, LSAbytes

Constructor Summary

Constructors

Constructor and Description
OpaqueLSA() Default Constructor
OpaqueLSA(byte[] bytes, int offset) Create opaque LSA from a bunch of bytes

Method Summary

Modifier and Type	Method and Description
void	encodeLSAHeader()
boolean	equals(Object object) Compare LSA by LStype
int	getOpaqueId()
int	getOpaqueType()
void	setOpaqueId(int opaqueId)
void	setOpaqueType(int opaqueType)

Methods inherited from class es.tid.ospf.ospfv2.lsa.LSA

encode, getAdvertisingRouter, getChecksum, getLength, getLinkStateId, getLSAbytes, getLSage, getLSlength, getLSsequenceNumber, getLStype, getLStype, getOptions, printHeader, setAdvertisingRouter, setLength, setLinkStateId, setLSage, setLSsequenceNumber, setLStype, setOptions

Methods inherited from class java.lang.Object

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

Constructor Detail

OpaqueLSA

public OpaqueLSA()

Default Constructor

OpaqueLSA

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

Create opaque LSA from a bunch of bytes

Parameters:

bytes -

offset -

Throws:

MalformedOSPFLSAException

Method Detail

getOpaqueType

public int getOpaqueType()

setOpaqueType

public void setOpaqueType(int opaqueType)

getOpaqueId

public int getOpaqueId()

setOpaqueId

public void setOpaqueId(int opaqueId)

encodeLSAHeader

public void encodeLSAHeader()

Overrides:

encodeLSAHeader in class LSA

equals

public boolean equals(Object object)

Description copied from class: LSA

Compare LSA by LStype

Overrides:

equals in class LSA