Method and apparatus for configuring network devices with subnetworks in an ATM environment and retrieving permanent virtual channel (PVC) configuration information from network devices

• US 6,714,972 B1
• Filed: 11/13/2001
• Issued: 03/30/2004
• Est. Priority Date: 12/22/1997
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Lee, Gabriel, Langley, David
• Primary Examiner(s): Thompson, Marc D.
• Assistant Examiner(s): Prieto, Beatriz
• Application Number:
  US10/010,811
• Time in Patent Office: 868 Days
• Field of Search: 709/223, 709/224, 709/218, 709/202, 709/220, 370/395, 370/399, 370/397
• US Class Current: 709/220
• CPC Class Codes: H04L 12/5601 Transfer mode dependent, e.g. ATM
• CPC Class Codes: H04L 2012/5626 Network management, e.g. Intelligent nets
• CPC Class Codes: H04L 41/0213 Standardised network management protocols, e.g. simple network management protocol [SNMP]
• CPC Class Codes: H04L 41/0816 the condition being an adaptation, e.g. in response to network events
• CPC Class Codes: H04L 41/0853 by actively collecting configuration information or by backing up configuration information
• CPC Class Codes: H04L 41/0856 by backing up or archiving configuration information
• CPC Class Codes: H04L 41/0889 Techniques to speed-up the configuration process
• CPC Class Codes: H04L 41/0895 Configuration of virtualised networks or elements, e.g. virtualised network function or OpenFlow elements
• CPC Class Codes: H04L 49/1553 Interconnection of ATM switching modules, e.g. ATM switching fabrics

Abstract

A method and apparatus retrieves and stores configuration information for network endpoint devices from other devices in the network, such as a switch adjacent to the endpoint device. When the endpoint device establishes a connection with the network, it generates a sequence of SNMP getnext commands using the ILMI interface to obtain the configuration information from the network device. If the network device sends a trap to the endpoint device indicating a change has been made to the configuration parameters stored in the network device for a PVC, a series of SNMP getrequest commands are made using the ILMI interface to retrieve the configuration information for that PVC from the network device. If the endpoint device detects an interruption in communication with the network device, the endpoint device discards the information retrieved previously.

Claims

1. An apparatus for retrieving Permanent Virtual Channel (PVC) configuration information from a network device coupled to the apparatus, wherein the PVC configuration information specifies one or more PVCs defined for the network device, the apparatus comprising:

a PVC configuration parameter storage having a first input for receiving the PVC configuration information, the PVC configuration parameter storage for storing at least a portion of said PVC configuration information and providing a portion of said PVC configuration information at an output;

a request generator for generating and providing to an output at least one request for PVC configuration information for at least one logical interface, wherein each PVC is uniquely identified by a Virtual Path Identifier (VPI) and a Virtual Channel Identifier (VCI), the request generator being configured to;

if the VPI and VCI for a particular PVC are known, generate an ILMI getrequest command that includes the known VPI and VCI for the particular PVC, and

if the VPI and VCI for a particular PVC are not known, generate an ILMI getnext command that includes a specified VPI and a specified VCI that indicate that the VPI and VCI for a particular PVC are not known;

a network protocol adapter having an input coupled to the request generator output for receiving the at least one request for PVC configuration information and providing at an input/output logically configured into the at least one logical interface and coupled to the network device at least one message responsive to the at least one request for PVC configuration information, and for receiving at the first input/output at least one message from the network device and generating and providing at an output, on the network protocol adaptor, at least one message comprising the PVC configuration information responsive to at least one of the messages from the network device received at the network protocol adapter input/output;

a response receiver having

first input coupled to the network protocol adapter output for receiving the PVC configuration information from the network protocol, adaptor;

a first output coupled to the PVC configuration parameter storage input;

a second output coupled to the ILMI request generator,

second input operatively coupled to receive an indicator responsive to an interruption in transmission between the apparatus and the network device;

a deleter having an input coupled to the second input of the response receiver and an output coupled to the first output of the response receiver;

wherein the response receiver is configured to provide to the first output of the response receiver at least a portion of the PVC configuration information received at the response receiver first input in response to an identifier contained in the message received at the response receiver first input from the network protocol adaptor;

wherein the response receiver is further configured to extract VPIs and VCIs from the PVC configuration information and provide the VPIs and VCIs to the request generator to be used by the request generator to generate subsequent ILMI requests;

wherein the response receiver is further configured to generate identification data that indicates that the at least a portion of the PVC configuration information was received from the network device; and

wherein the deleter is configured to cause, based upon the identification data and receipt of the indicator at the input, of the deleter, the at least a portion of the PVC configuration information to be selectively deleted from the PVC configuration parameter storage.

2. The apparatus of claim 1 wherein the network protocol adapter comprises a segmenter and reassembler having a first input/output coupled to the input of the network protocol adapter for receiving at least one of the requests for PVC configuration information and to the output of the network protocol adapter, the segmenter and reassembler for:

generating and providing at second input/output coupled to the network protocol adapter input/output at least one ATM cell responsive to at least one of the requests for PVC configuration information received at the segmenter and reassembler first input/output; and

receiving at the second input/output at least one of the messages received from the network device and providing at the first input/output coupled to the network protocol adapter output at least one message responsive to at least one of said messages received from the network device.

3. The apparatus of claim 2, wherein the network protocol adapter additionally comprises a message protocol adapter for:

receiving at an input coupled to the request generator output at least one of the requests for PVC configuration information from the request generator and providing at first input/output coupled to the segmenter and reassembler first input/output at least one SNMP command responsive to at least one of said requests for PVC configuration information; and

receiving at second input/output coupled to the segmenter and reassembler second input/output at least one message responsive to at least one of the messages received from the network device and providing at an output at least a portion of the PVC configuration information of said message.

4. The apparatus of claim 1, wherein the request generator has an input operatively couple to receive a status message and wherein the ILMI getnext command is responsive to the status message.

5. The apparatus of claim 1, wherein at least one set of the VPIs and VCIs received at the response receiver first input comprise an SNMP trap.