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For example, due to a configuration change initiated by the user of the computer system, service endpoint FIG. This may give the user early notice of the need to add more memory to their system or to move some customers to different line cards.

DD publishes this name to NS b along with the process identification assigned by the operating system and the name of its service endpoints. Still other datashewt may not need any redundancy, and the user will not provide any backup line cards for that customer’s primary line cards.

For each process, models of configurable objects managed by those processes are also created. As described above, unlike a monolithic software architecture which is directly linked to the hardware of the computer system on which it runs, a modular software architecture includes independent applications that are significantly decoupled from the hardware through the use of a logical model of the computer system.

Similarly, if a software class, ATM failure or event has occurred, the type field may indicate a more specific type of ATM failure or event, for instance, a private network-to-network interface PNNI error or a growing message queue event.

Views also allow the logical model and physical system to be changed, evolved and grown to support new applications and hardware without having to change existing applications. The descriptor is sent to the local logging entity, which may log it in the local event log file before notifying the master logging entity, which may log it in the master event log file Local backup stores the last snap shot of critical state information used by the original device driver before it failed.

Developers of computer systems often use redundancy measures to minimize downtime and enhance system resiliency.

A view is a logical slice of the logical model and defines a particular set of data within the logical model to which an associated process has access. An Audit process resynchronizes the restarted device driver with associated applications and other device drivers such that the data plane can again transfer network data. The descriptor may also be sent to the local slave SRM, which tracks fault history based on the descriptor contents per application instance.

Application Programming Interfaces APIs define the format and type of information included in the messages. Card table 47 includes records corresponding module type and version number with the physical identification PID and slot number of that board. However, changes to the physical system, for example, adding a new type of board, will require changes to the logical model. Each element may provide software backup for one or more other elements.


If, instead of restarting a particular application, the software fault experienced by line card 16 a requires the entire element to be shut down and rebooted, then all of the processes executing on line card 16 a will be terminated including backup processes ATM — The SLR includes the name of a control shim executable file and a logical identification LID associated with a primary line card on which the application is to be spawned.

As described above, under the protected memory model, a failing process cannot corrupt the memory blocks used by other processes.

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In addition, the application may require data stored in the configuration database on the central processor or data datqsheet in the memory of other boards. A fault policy whether default or configured is specific to a particular scope and descriptor and indicates a particular recovery action to take. Additionally, if a configuration change is made through some other means, for example, a command line interface, and not through the NMS, the NMS will not be updated until the next poll, and if the network device crashes prior to the NMS poll, then the datasheett change will be lost.

The local slave SRM will catalog the event and v564a it with the local logging entity, which may also log it with the master logging entity.

When a process registers its name and process identification number, it may also register a version number indicating which API version should be used by other processes wishing to communicate with it.

The present invention provides a network device having an internal configuration database process for managing configuration of internal resources within the network device in response to configuration input provided by an external Network Management System NMS process.

Hence, while the ATM application is terminated and restarted, the device drivers continue to function. Multiple instances of applications and device drivers are more difficult to manage and require more processor cycles than a single instance of each but if an application or device driver fails, only the port those processes are associated with is affected.

As a result, a new class file can be added or updated on a computer system without having to reboot the computer system or update the NMS. Moreover, a monolithic image requires contiguous memory space, and thus, the computer system’s finite memory resources will limit the size of the image.

For a network device, backup state may include critical information that allows the primary process to quickly re-synchronize. ATM interface generates the same service endpoint name and subscribes to NS b for that service endpoint name.

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The OSE operating system and system services provide a single inter-process communications mechanism that allows processes to communicate regardless of their location in the system. B654a model is changed to include models of the new or upgraded software, and hardware model is changed to include models of any new hardware.


This is one Lot Qty. Inter-board communication is carried over some number of communication links. Central processor 12 may not become the backup central processor right away. Because the operating system provides a protected memory model that assigns different process blocks to different processes, including upgraded applications, the original applications will not share memory space with the upgraded applications dstasheet, therefore, cannot corrupt or change the memory used by the original application.


Hierarchical descriptors may be used to provide information specific to each failure or event. An even more resilient scheme would include multiple instances of ATM for each port. As a result, the same application may communicate with different versions of the same configurable object using a different API.

Each active element consumes some amount of the limited power available to the system. This is for 5 pcs of the 2SA Transistor. For example, if a hardware class, Ethernet subclass failure has occurred, the type field may indicate a more specific type of Ethernet failure, for instance, a cyclic redundancy check CRC error or a runt packet error.

The network device can further include a plurality of modular processes that communicate with the configuration database to access configuration data, where the processes utilize the configuration data to modify execution behavior. The configuration database detects LID 30, 31 and 32 in SLRs ab and crespectively, and sends slave SRMs 37 b37 c and 37 d line cards 16 a16 band 16 c notifications including the name of the executable file e.

Since the failure may require the hardware to be swapped out or failed-over to redundant hardware or the device driver itself to be re-started, the device driver notifies slave SRM 37 b. For a major revision level change, the NMS will download a complete image including a kernel image.

Each line card includes a control processor subsystem 18 a — 18 nwhich runs an instance of the kernel 22 a — 22 n including slave and client programs as well as line card specific software applications. Space is often limited, especially in the case of network service providers who may maintain hundreds of network devices.

Instead, the configured fault policy may only indicate a particular type of hardware failure, for example, CRC errors on transmitted Ethernet packets e. A change notification, sent to the NMS database by the configuration database, can include data representing the change to the configuration data. A distributed redundancy design is less expensive than many dahasheet The modification may also provide a temporary patch while a software or hardware upgrade is developed to fix a particular error.