Granted Patent B2

US 7,023,796 · App. 09/771,436 · Granted Apr 4, 2006

Abstract

Claims (20)

1. A method for identifying the current route of paths in a telecommunications MS-SPRINGS network, the MS-SPRING network comprising:

network elements or nodes, each node comprising a controller, the controller comprising controller status;

fiber optic spans interposed between the network elements to form a ring, each network element being connected to adjacent network elements through said fiber optic spans allowing a bidirectional communication therebetween;

at least one path connecting two or more network elements of the ring, the at least one path, in a network free-of-failure condition, following a corresponding at least one Path Nominal Route;

a network manager; and

a mechanism for protecting traffic travelling in the network, said protection mechanism being shared in the network and being operated by the network manager, the method comprising:

(a) providing the network manager with information relating to the Nominal Route of the at least one path; and

(b) providing the network manager with information of current status of the at least one network element, wherein it comprises the step of:

(c) processing, at the network manager, the information provided through steps (a) and (b) so as to calculate the current route of the at least one path, by:

(c1) analyzing the Path Nominal Route of the at least one path;

(c2) making a determination as to whether at least one of the Nominal Route spans comprises a node requesting the intervention of the protection mechanism to serve a failure or a user command resulting in a span re-routing;

(c3) when the determination in (c2) is in the affirmative, declaring that the current route coincides with the nominal route, with a main span being replaced by a spare span; and

(c4) when the determination in (c2) is in the negative, checking for ring re-routing by determining whether at least one of the spans of the Nominal Route is bounded by a node requesting the intervention of the protection mechanism to serve a failure or a user command resulting in a ring re-routing.

2. A method according to claim 1 , further comprising identifying what paths are carried at a given span.

3. A method according to claim 1 , further comprising declaring that the current route coincides with the Nominal Route when the check for ring re-routing is negative.

4. A method according to claim 3 , further comprising:

when the check for ring re-routing is affirmative, making a negated route ring determination as to whether any spans of the negated route comprise a ring node;

when the negated route ring determination is negative, declaring that the current route coincides with the Ring Spare Route; and

when the negated route ring determination is affirmative, declaring that the current route coincides with the nominal route.

5. A computer-readable medium having a program recorded thereon, said computer-readable medium comprising computer program code means adapted to perform all the steps of claim 1 when said program is run on a computer.

Assignments (11)