Ring control node

• US 20030145254A1
• Filed: 06/06/2002
• Published: 07/31/2003
• Est. Priority Date: 01/29/2002
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Okamoto, Takuya, Honda, Takashi, Ookawa, Naokatsu
• Granted Patent: US 6,993,684 B2
• Time in Patent Office: Days
• US Class Current: 714/43
• CPC Class Codes: H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks

Abstract

The present invention relates to a ring system, in particular to a ring control node which increases the upper limit of the number of nodes that can be arranged on one ring by a BLSR control and conforms to an increase in line capacity and the scale of a system. The ring control node made of a plurality of nodes for performing ring control, and spans for connecting the plurality of nodes in a ring shape, and each of the nodes detects a fault occurring in a span between itself and another node adjacent thereto, and transmits the fault information to the other node using, as a destination, a span ID assigned to the span.

Claims

1. A ring control node comprising:

a plurality of nodes for performing ring control, and

spans for connecting said plurality of nodes in a ring shape,

wherein each of the plurality of nodes detects a fault occurring in a span between itself and another node adjacent thereto, and transmits fault information to said other node using as a destination a span ID assigned to said span.

2. The ring control node according to claim 1, wherein each of said nodes forms a topology map of the entire ring in which a node ID assigned to a node on either one of an adjacent east side and west side enclosing one of the above spans corresponds to a span ID of said span.

3. The ring control node according to claim 2, wherein each of said nodes determines a destination of said fault information by means of the span ID, and performs a path through operation on the fault information when the destination is that of a node other than itself.

4. The ring control node according to claim 3, wherein adjacent nodes enclosing said span detect a nonconformity in a topology map by means of the span ID of the span common to both of the nodes.

5. The ring control node according to any one of claims 1 to 4, wherein the ring control is a BLSR control, and substitutes the span ID for the transmitting node ID and the receiving node ID of the BLSR control.