Method and apparatus for dynamic configuration and checking of network connections via out-of-band monitoring

• US 6,757,297 B1
• Filed: 05/28/1999
• Issued: 06/29/2004
• Est. Priority Date: 01/05/1999
• Status: Expired due to Term

• Current Assignee: Ciena Corporation
• Original Assignee: Ciena Corporation
• Inventors: Chin, Hon Wah
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Schultz, William
• Application Number:
  US09/321,979
• Time in Patent Office: 1,859 Days
• Field of Search: 370/216, 370/217, 370/218, 370/221, 370/222, 370/225, 370/226, 370/255, 370/256, 370/469, 709/249, 709/221, 709/225, 709/250
• US Class Current: 370/469
• CPC Class Codes: H04L 2012/5625 Operations, administration and maintenance [OAM]
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 41/046 comprising network management agents or mobile agents therefor
• CPC Class Codes: H04L 41/06 Management of faults, events, alarms or notifications
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 41/0893 Assignment of logical groups to network elements
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 43/0817 by checking functioning
• CPC Class Codes: H04L 43/10 Active monitoring, e.g. heartbeat, ping or trace-route

Abstract

A first network element includes or is associated with a query engine that allows it to retrieve operating parameters from a second network element even when the first and second network elements are not participating in a common routing protocol. The first element is thereby able to determine if the second network is operational and to take action to reroute data to a backup element if the second element is not operational.

Claims

1. A method for use in communication systems having at least a first network layer group of first network layer elements and a second network layer group of second network layer elements comprising:

at a first network layer element, sending a query in a network management protocol to a first element in said second network layer group requesting status of that element, the first network layer group and the second network layer group being part of a hierarchical arrangement of network layers for handling traffic data, wherein the first network layer group provides different networking functions for handling the traffic data than the second layer group;

wherein, the query is generated by a request engine in said first network layer element, said request engine generating queries to the first element in said second network layer group a response to which by the first element in said second network layer group is used by the first network layer element to infer operation of said first network layer element, and for receiving responses from the first element in said second network layer group, the responses including connection and operation information;

at the first network layer element, receiving a response from a management agent of the first element in said second network layer group indicating whether an element in said second layer group has a predefined operating status; and

at the first network layer element, upon receiving the response including the operating information from the first element in the second layer group that an element in said second layer group has a predefined operating status indicating that rerouting is desirable, rerouting data traffic to a backup second network layer element according to the connection information wherein queries and responses are transmitted using an SNMP network management protocol.

2. The method according to claim 1 wherein said queries are transmitted using get and set operators performed on variables indicating operating parameters.

3. The method according to claim 1 wherein said first network layer is part of a sublayer providing sublayer transport services to said second network layer.

4. The method according to claim 1 wherein said first network layer is part of an optical communication layer.

5. The method according to claim 1 wherein said first layer comprises higher network layer elements than said second layer.

6. The method according to claim 1 wherein said second network layer comprises higher network layer elements than said first network layer.

7. The method according to claim 1 wherein said query is first sent to a second element in said first network layer group and wherein said second element in said first network layer group is more directly connected to said first element in said second network layer group.

8. The method according to claim 7 wherein said query is sent in a first protocol used by said first network layer and wherein said query is formed by said second element in said first network layer group into the management protocol used by said second network layer.

9. The method according to claim 7 wherein queries and responses are transmitted using an SNMP network management protocol.

10. The method according to claim 7 wherein transmission via elements in the first layer group is by encapsulation in IP packets and is directed by IP routing protocols.

11. The method according to claim 7 wherein transmission via elements in the first network layer group is by an open shortest path first routing protocol.

12. The method according to claim 7 wherein transmission via elements in the first network layer group is directed by bridge forwarding over a spanning tree.

13. The method according to claim 1 wherein said first network layer element transmits to a remote second network layer element by sending on its local link connected to local second network layer elements packets in the network management protocol used by the second network layer elements and utilizing the forwarding function of the second network layer to forward the packets to the remote second network layer element.

14. The method according to claim 1 further comprising:

at the first network layer element, if a response is not received to a first query to the first element in said second network layer, sending a second query to a second element in said second network layer group requesting status of the connection with said first network layer element;

at the first network layer element, rerouting data traffic from the first element in said second network layer group to a backup element in said second network layer group only upon receiving a response from the second element in said second network layer group that a connection with said first element is experiencing performance problems.

15. The method of claim 1 further comprising:

storing information regarding the identity of the second network layer element and the responses received by the request engine.

16. The method of claim 1 wherein the first network layer is a physical layer and the second network layer is a data link layer.

17. A method for operating an optical communications network element having configurable channels comprising:

receiving a light signal on an input port from an input channel at an element in a first network layer;

coupling a portion of said light signal up to all of said light signal to an output channel via a configurable circuit;

receiving, from a management agent at an element operating in a second network layer, said agent designed for communication with a management station, a response to a query in a network management protocol indicating that an element operating in the second network layer has a predefined operating status, the first network layer and the second network layer being part of a hierarchical arrangement of network layers, wherein the first network layer provides different networking functions than the second network layer; and

in response thereto, routing data to a backup element in said second network layer wherein said response and said query are transmitted using an SNMP network management protocol and said agent is an SNMP agent.

18. An optical network for providing network data communications among a plurality of served nodes, said optical network comprising:

at least one optical element;

a plurality of optical channels, said optical element and optical channels configurable to provide a plurality of optical connections;

said optical element including a database that stores information regarding the identity of served nodes for a connection and the identity and routing path for backup nodes for said served nodes;

said optical element including a request engine that generates queries in a network management protocol to management agents at said served nodes, said queries regarding operational status of a served node or of a connection seen by a served node and for receiving responses from said served nodes, said optical element is in a first network layer and said served node is in a second network layer, the first and second network layers being part of a hierarchical arrangement of network layers, wherein the first network layer provides different networking functions than the second network layer;

said optical network element including an inference engine that determines, from said responses, whether a served node has developed a predefined operating status; and

said optical element including reconfiguration circuits that can route traffic directed to a node with said predefined operating status to an alternative path wherein said requests are transmitted using an SNMP network management protocol and said management agents are SNMP agents.

19. A network according to claim 18 wherein said operating parameters are transmitted using get and set operators performed on variables indicating operating parameters.