公开(公告)号：JP2001007859A

公开(公告)日：2001-01-12

申请号：JP2000151713

申请日：2000-05-23

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BUCHANAN WILLIAM M ,  CAO YANG ,  LEFOLEY STEPHEN G

IPC: H04J3/14 ,  H04L12/437 ,  H04L12/56 ,  H04L29/14 ,  H04Q11/04

Abstract: PROBLEM TO BE SOLVED: To surely and easily recover transfer of a signal by setting a plurality of paths explicitly instructed between a source and a receiver side router and allowing the receiver side router to select one of the paths instructed explicitly as a primary path, to make communication along the selected path and to immediately select a secondary path as a new primary path on the occurrence of a fault in the primary path. SOLUTION: A node S makes communication to a node E by using a plurality of explicit label switching path indication paths in existence between the nodes S and E. Using a label distribution protocol can assist setting of a label switching path LSP on the basis of a restriction condition of the explicit path instruction. The restriction condition of an explicit path instruction provides an inter-termination setup device with a method that uses a label distribution protocol of the LSP with an instructed path on the basis of a restriction condition started by an input LSR top reserve a resource. A plurality of the explicit path instruction label switching path is set between the router LSRS and an LSRE.

公开(公告)号：JP2001308888A

公开(公告)日：2001-11-02

申请号：JP2001074805

申请日：2001-03-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BUCHANAN WILLIAM M ,  CAO YANG ,  SUREK STEVEN A

IPC: H04B10/20 ,  H04L12/28 ,  H04Q11/00

Abstract: PROBLEM TO BE SOLVED: To provide an optical communication system, that can automatically find out port-to-port connectivity information, that is, port binding information without the need for converting from optical signaling into electrical signaling. SOLUTION: One of a group of optical network elements making communication via an out of band channel, such as a LAN is selected as a network element leader. After the selection, the leader network element adjusts a port discovery process, requests port recognition, replies to a request, and other message is transmitted via the network element leader on the out of band channel from one non-leader network element to others. When the leader network element sets up a recognition process, a recognition request network element transmits an optical test signal to all the other networks along a link in question.

公开(公告)号：CA2308693A1

公开(公告)日：2000-11-25

申请号：CA2308693

申请日：2000-05-15

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BUCHANAN WILLIAM M ,  LEFOLEY STEPHEN G ,  CAO YANG

IPC: H04J3/14 ,  H04L12/437 ,  H04L12/56 ,  H04L69/40 ,  H04Q11/04 ,  H04L12/28 ,  H04L29/04 ,  H04L29/06 ,  H04L29/14

Abstract: A router in accordance with the principles of the present invention employs explicit routing protocols to establish a plurality of explicitly routed label switched paths between source and sink routers. The sink router selects one of these explicitly routed paths as a primary path and communicates along that path. Upon a failure in a path selected as a primary path, a secondary path is instantaneously selected as the new primary path. Since the new route has already been established, there is no need to re-compute the path at the time of a failure. Consequently, a new path is rapidly established in response to the failure of a path. One of the new routers may employ physical level maintenance information, such as loss of signal (LOS) or loss of pointer (LOP), for example, to detect such path failures. Additionally, the new router may employ provisioned flow information to propagate path failure alarms.

公开(公告)号：AU2647501A

公开(公告)日：2001-09-20

申请号：AU2647501

申请日：2001-03-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： BUCHANAN WILLIAM M ,  SUREK STEVEN A ,  CAO YANG

IPC: H04B10/20 ,  H04L12/28 ,  H04Q11/00

Abstract: In an optical telecommunications network in accordance with the principles of the present invention, a link connection undergoes an automatic port recognition process, whereby the port binding information for the link is detected, recorded and shared with the network elements connected by the link, before the link is used to transmit bearer traffic. One of a group of optical network elements that communicate through an out of band channel, such as a LAN, is "elected" a network element leader. After election, the leader network element coordinates the port discovery process; requests for port "recognition", responses to requests, and other messages are passed through the network element leader on the out of band channel from one non-leader network element to another. Once the recognition process is set up through the leader network element, an optical test signal is transmitted along the link in question from the recognition requesting network element to all other network element s in the network. The receiving network elements monitor the power level at each of their "inactive" ports and the inactive port at which an increased energy level is detected is determined to be the port attached to the link in question.

公开(公告)号：CA2334159A1

公开(公告)日：2001-09-15

申请号：CA2334159

申请日：2001-02-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： SUREK STEVEN A ,  CAO YANG ,  BUCHANAN WILLIAM M

IPC: H04B10/20 ,  H04L12/28 ,  H04Q11/00 ,  H04L29/02

Abstract: In an optical telecommunications network in accordance with the principles of the present invention, a link connection undergoes an automatic port recognition process, whereby the port binding information for the link is detected, recorded and shared with the network elements connected by the link, before the link is used to transmit bearer traffic. One of a group of optical network elements that communicate through an out of band channel, such as a LAN, is "elected" a network element leader. After election, the leader network element coordinat es the port discovery process; requests for port "recognition", responses to requests, and other messages are passed through the network element leader on the out of band channel from one non-leader network element to another. Once the recognition process is set up through the leader network element, an optical test signal is transmitted along the link in question from the recognition requesting network element to all other network elements in the network. The receiving network elements monitor the power level at each of their "inactive" ports a nd the inactive port at which an increased energy level is detected is determined t o be the port attached to the link in question.