METHOD FOR SETTING PATH AND NODE APPARATUS

• US 20080056159A1
• Filed: 05/24/2007
• Published: 03/06/2008
• Est. Priority Date: 09/01/2006
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Suzuki, Motoki, Fukashiro, Yasuyuki
• Application Number:
  US11/753,001
• Publication Number:
  US 20080056159A1
• Time in Patent Office: Days
• US Class Current: 370/254
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/28 using route fault recovery
• CPC Class Codes: H04L 45/50 using label swapping, e.g. multi-protocol label switch [MPLS]

Abstract

In a GMPLS node provided with inter-node control protocols including GMPLS, when an adjacent node is in a failure state, path establishment is automatically accomplished by providing a temporary reply to a path establishment request source node in response to a path establishment request, securing a source of an intermediate route, repeatedly transmitting a path establishment request to the adjacent node in the failure state according to specified conditions after completion of temporary path establishment, performing a path establishment process for the remaining section when the adjacent node recovers from the failure, and then transmitting a path establishment completion notification message to the request source node.

Claims

1. A method for setting a path that comprises the steps of:

upon reception of a first path establishment request of enforcement mode, transmitting a second path establishment request to an adjacent node;

determining a failure of said adjacent node;

upon determination that a failure exists in communication with said adjacent node, transmitting a temporary path establishment reply to a source of said first path establishment request; and

upon reception of completion of the temporary path establishment from said source, transmitting a third path establishment request to said adjacent node according to conditions described in said temporary path establishment completion.

2. The method for setting a path according to claim 1, further comprising the step of transmitting a second path establishment reply to said source upon reception of the first path establishment reply from said adjacent node.

3. The method for setting a path according to claim 1, further comprising the step of transmitting a path deletion request to said source, when no path establishment request is received from said adjacent node under said conditions.

4. A node apparatus comprising:

a message reception unit;

a message transmission unit; and

an adjacent node state determination unit,

wherein when said message reception unit receives a first path establishment request of enforcement mode, said message transmission unit transmits a second path establishment request to an adjacent node,

when said adjacent node state determination unit determines that a failure exists in communication with said adjacent node, said message transmission unit transmits a temporary path establishment reply to a source of said first path establishment request, and

when said message reception unit receives completion of temporary path establishment from said source, said message transmission unit transmits a third path establishment request to said adjacent node according to conditions described in said temporary path establishment completion.

5. The node apparatus according to claim 4,

wherein when said message reception unit receives a path establishment reply from said adjacent node, said message transmission unit transmits a second path establishment reply to said source.

6. The node apparatus according to claim 4,

wherein when said message reception unit does not receive a path establishment reply from said adjacent node under said conditions, said message transmission unit transmits a path deletion request to said source.