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ATM Network Connection Management Using Mobile Agents

ATM Network Connection Management Using Mobile Agents. S. Lazar, S. Kodeswaran, R. Varadharaj, and D. Sidhu. Outline. ATM Connection Management Current Approach MA-based Approach Conclusions. ATM Connection Management. ATM networks are fundamentally connection-oriented.

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ATM Network Connection Management Using Mobile Agents

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  1. ATM Network Connection Management Using Mobile Agents S. Lazar, S. Kodeswaran, R. Varadharaj, and D. Sidhu

  2. Outline • ATM Connection Management • Current Approach • MA-based Approach • Conclusions

  3. ATM Connection Management • ATM networks are fundamentally connection-oriented. • A virtual circuit has to be established before data transfer. • A virtual circuit can be a virtual path or a virtual channel. • Virtual channels are identified by a combination of • The Virtual Channel Identifier (VCI) and • The Virtual Path Identifier (VPI)

  4. Current Approaches • Current approaches to Permanent Virtual Connection (PVC) establishment are based on a pure client/server type interaction between • the network administrator and • the Intermediate System (IS) that comprise the VC. • The network administrator has to directly interact with each IS along the Virtual Channel (VC) to set up the virtual connection. • telnet sessions • SNMP sessions

  5. MA-based Approach • The agent is initialized with an itinerary that contains the list of addresses for each IS. • Next the agent is migrated to the workstation where the desired virtual path link originates. • The agent first obtains the interface identifiers for both the previous and next-hop ATM devices based on its itinerary. • Next the agent obtains the index of the traffic descriptor entry that matches the desire traffic type specified by the network manager. • At this point, the agent is ready to create the necessary virtual links and cross connect them at the switch.

  6. MA-based Approach (Cont.) • First, the agent configures the incoming VPL, which is terminated at the local ATM switch. • Next, this procedure is repeated to create and setup the VPL that will originate from this device. • Finally, the agent cross connects these virtual path links and moves onto the next switch where it repeats this procedure.

  7. Implementation • The proposed scheme was built on the top of the Discovery mobile agent architecture – developed at the Maryland Center for Telecommunications Research (MCTR). • The proposed algorithm was tested on a real-life ATM testbed at the MCTR. • The network is composed of a ForeRunner ASX-200WG from Fore Systems, two LightStream 1010 and a BPX wide area network switch from Cisco, and an IBM 8260 ATM switch.

  8. Conclusions • Advantages of the MA-based approach: • It eliminates the excessive bandwidth required to transmit managed information from the intermediate switching elements to the managing applications. • It removes almost all the processing from the manager applications. • It allows the elimination of the need for constant interaction between the human manager and each IS.

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