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Method for providing for automatic topology discovery in an ATM network or the like
| Details |
Inventors: Chatwani, Dilip; Subramanian, Rajan; Chiang, Winnis; Davar, Jonathan; Opher, Ayal; Sawant, Shiva;
Assignee: Bay Networks, Inc. (Santa Clara, CA)
Primary Examiner: Coleman; Eric
Assistant Examiner:
Attorney, Agent or Firm: Blakely, Sokoloff, Taylor & Zafman
A synchronous transfer mode (ATM) network or the like employing a method and apparatus for automatically determining the topology of the network is described. The method and apparatus provides for each switch in the network transmitting on each of its ports link advertisement messages (without processing intervention by intermediate switches). The link advertisement messages are received by neighbor switches and forwarded to a topology manager. The topology manager constructs network topology profile information based on received link advertisement messages. Further, the topology manager is able to verify bidirection links based on the received link advertisement messages. |
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DETAILED DESCRIPTION The present invention provides a method and apparatus for providing for automatic topology discovery in an ATM network or the like.
Importantly, as demand for ATM networks grow, the number of switches and links in an ATM network is also expected to grow.
In addition, the links between the various switches are subject to periodic failure.
Thus, it is desirable to discover and manage the topology of an ATM network efficiently and dynamically.
The topology information can then be used for network management, including, for example, for generation of information for a network manager regarding the topology, fault diagnosis, or for connection management including, for example, calculations of optimal routes between ATM connections, and the like.
In the described system, method and apparatus are provided to allow communication of topology information from a first switch to a network manager which is capable of performing topology management services.
The topology information is transmitted in the form of a fixed size cell (specifically, ATM cell) from each of the ports of each switch (referred to below as the "originating switch") in the network over its meta-topology channel and virtual service path to its neighboring switches.
These topology information cells are referred to herein as link advertisement messages (LAMs).
Each neighboring switch receives the topology cell and, utilizing its switch fabric, forwards the cell to the network manager over the its virtual service path.
Thus, communication of the LAM messages is accomplished without flooding on the network.
The cell identifies, in an information payload area, the switch number of the originating switch and the port number of the originating switch on which the cell was transmitted.
In the described system, the neighbor switch fabric alters a cell header area to information identifying to the network manager the neighbor switch and the port on which the cell was received by the neighbor switch.
Using the information identifying the originating switch/port and the neighbor switch/port, along with information received from other switches/ports in the network, the network manager is able to develop information profiling the topology of the network
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Television 
