Optical Control Plane in Software Generating qr-codes in Software Optical Control Plane UPCA for visual basic

Optical Control Plane using none todevelop none with web,windows applicationupc-a generation then an LSR considers none for none that its neighbor has failed. It can then take appropriate action such as reporting the failure to the higher management layers..

QR Code Overview RSVP-TE with Enhancements for GMPLS Support The principal extensi none none ons to the MPLS signaling protocols to accommodate signaling in an optical network deal with the handling of multiple underlying technologies, path setup for bidirectional connections, and the independence between the control and data planes. Optical networks can potentially accommodate a variety of multiplexing and switching technologies and techniques; for example, SONET/SDH coexisting with wavelength switching or wavelength and ber switching and so on. To support diverse types of switching and multiplexing, new label formats and requests are needed.

Thus, RSVPTE must be able to support the generalized label concept for establishing LSPs at any architectural layer in a network [Berger+03b]. To this end, new objects are de ned in GMPLS RSVP-TE as follows: r Generalized label request object: Replaces the label request object in RSVP-TE and carries the following information: LSP encoding type, switching type, generalized protocol ID (the type of payload), source and destination end points, and connection bandwidth. It is carried in the Path message.

r Generalized label object: Replaces the label object in RSVP-TE. It is carried in the Resv message. r Suggested label object: Allows the upstream node to suggest to its downstream node which generalized label to return in the response phase to avoid delays during the response phase.

It is carried in the Path message. r Upstream label object: The label selected by the upstream node for the reverse direction of the connection (destination to source). It is carried in the Path message and is used for bidirectional connections.

As mentioned above, while MPLS RSVP-TE is used for unidirectional LSPs, lightpaths are typically bidirectional, necessitating this extension. r Label set object: Used by an upstream node to control the selection of labels by the downstream nodes. It is carried in the Path message.

For example, if the labels are wavelengths only a set of distinct wavelengths will be available for the connection. r Acceptable label set object: Generated by a node when that node cannot accept a speci c label. It is carried in PathErr, ResvErr, and Noti cation messages (de ned below).

r Protection information object: Indicates the protection type on each link in the path. It is carried in the Path message. r Administrative status object: Used to signal administrative actions such as testing of a connection.

r Interface identi cation object: Identi es the data link on which labels are being assigned. This is required because in optical networks control and data planes are separate (logically and possibly physically), and signaling over an out-of-band control link will cover multiple data links. The separation of control and data transport.

Multiwavelength Optical Networks allows for continued none none functioning of data connections even if the signaling system fails. r Noti cation request object: Indicates the address to which a failure noti cation should be sent. This signaling extension for noti cation messages is needed to accommodate error handling and provide quick noti cation of failures to the nodes responsible for protecting/restoring the failed LSPs.

Section 9.3.3.

5 presents an example of signaling for failure protection in optical networks.. Lightpath Establishment and Tear-Down Using GMPLS RSVP-TE In GMPLS, Path and Re none none sv messages are still used to provision a connection. However, in contrast to IP and MPLS, the DCN for signaling does not use the same links as those on which the connection is established. The Path message now carries the LSP tunnel session object, explicit route object, interface identi cation object, generalized label object, sender Tspec, sender template, and upstream label objects.

Each intermediate node receives the Path message, creates a Path state, modi es the explicit route, upstream label, and interface identi cation objects, and forwards the message downstream. A Resv message is then generated when the Path message reaches the destination node. At each intermediate node processing the Resv message, the cross-connects are set to establish a bidirectional connection.

PathTear messages alone cannot in this case be used for the deletion of a connection in optical networks, because when the rst cross-connect is recon gured to tear down the path the downstream nodes will think that a failure has occurred. This will in turn trigger efforts to protect the connection using the protection or restoration mechanisms that have been put in place. To circumvent this problem, a Path message containing an administrative status object is sent by the ingress node along the connection path, to indicate to all nodes in the path that the connection is in the process of being deleted.

A Resv message is generated in response, also with an administrative status object. On reception of the Resv message at the ingress node a PathTear message is then generated and as intermediate nodes in the path receive this message they delete their Path and Resv states..

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