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For a network device, it is critical to continue to pass data and not lose network connections. If the device driver has published its name and process identification with NS bthen NS b notifies ATM of the process identification number associated with atm.
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Consequently, when the NMS adds to or changes these tables, configuration database 42 sends a notification to the master SRM and includes the change.
This also allows an application, for example, ATM, to be upgraded to support new configurable objects, for example, new ATM interfaces, while still being backward compatible by supporting older configurable objects, for example, old ATM interfaces. The NMS uses the information received from the user to create records in several tables in the configuration database, which are then copied to the NMS database.
After passing the power-up tests, processor 24 on datashset processor 12 then downloads kernel software 20 from persistent storage 21 into non-persistent memory in memory subsystem The descriptors can be stored in master event log file or local event log files a — n through which faults and datashdet may be tracked and displayed to the user and allow for fault detection at a fine granular level and proactive response to events.
Since the descriptors are hierarchical from left to right, wildcards in descriptor fields only make sense from right to left. The configuration database software is robust and takes a considerable amount of these limited resources but provides many advantages as described below. Monitoring and proactively responding to events may also allow the computer system datasheeh network operators to address issues before they become failures.
A distributed redundancy architecture spreads software backup hot state across multiple elements. As a result, there is only a limited connection between the computer system’s software and hardware, which allows for multiple versions of the same application to run on the computer system simultaneously and different types of applications to run daatasheet on the computer system.
The different message formats for each version may be hard coded into ATM or ATM may access system memory or the configuration database for the message formats corresponding to service endpoint version one and version two. A protected memory feature also helps enforce the separation of modules.
Upgrading a distributed application that is running on multiple boards is more complicated than upgrading an application running on only one board.
Alternatively, the failing device driver may have corrupted the hardware, thus, resetting the hardware as soon as the device driver is terminated may be important to prevent data corruption. LRM passes the fault to local slave SRM 37 bwhich catalogs the fault datxsheet the ATM application’s fault history and sends a notice to local slave logging entity b. N and one board per slot 1: Similarly, vertical stacksand include one instance of ATM, and one device driver 43 b43 c43 drespectively and each vertical stack is associated with a separate port 44 b44 c44 drespectively.
If the device driver is for a particular port, then the SMS must also search the port table to learn the PID for that port.
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Using the logical model, a view id and API are generated for each application to define each application’s access to particular data in a configuration database. An even more resilient scheme would include multiple instances of ATM for each port. Hence, while the ATM application is terminated and restarted, the device drivers continue to function. Configuration database 42 sends a notification to master SMS including the name of the driver to be upgraded.
Typically, work station 62 is coupled to many network computer systems, and NMS 60 is used to configure and manage each eatasheet these systems. If the status did change, then communications have been stalled for the length of time between polls. For example, instances of other software applications, such as an IP application, and additional instances of ATM may be spawned as described above on line b54a 16 a or other boards in computer system Modules are compiled and linked as separate programs, and each program runs in its own protected memory space.
The network device can be, for example, a switch, a router, or a hybrid switch-router. As described above, the PMD file corresponds the module type and version number of a board with the mission kernel image for that board as well as the device drivers for that board. Alternatively, a master ATM application not shown running on central processor 12 may perform active queries of the configuration database and pass information to each slave ATM application running on the various line cards regarding the number of ATM interfaces each slave ATM application needs to spawn.
Let us fix the problem for you. As described above, under the protected memory model, a failing process cannot corrupt the memory blocks used by other processes. A disadvantage to this approach is that objects within one high level process will likely need to communicate with objects within other high datadheet processes. Moreover, a monolithic image requires contiguous memory space, and thus, the computer system’s finite memory resources will limit the size of the image.
Through the use of the logical to physical port table LPPTthe service endpoint number also corresponds to the logical identification number LID of the port.
We will do our best to get back to you as soon as possible. Instead, the MCD parameterizes its operations on a particular board by looking up the card type and version number in the PMD file and acting accordingly. Corrective action may require failing-over one or more line cards 16 a — 16 n or other boards, including central processor 12to redundant backup boards or, where backup boards are not available, simply shutting particular boards down. In the case where applications and drivers for a line card added to computer system 10 are already loaded, the configuration change is similar to initial configuration.
Adding or removing known i. For a network device, backup state may include critical information that allows the primary process to quickly re-synchronize.
Configuration database 42 may automatically copy the changes made to SET 76 and ATM instance table to persistent storage 21 such that if the computer system is shut down and rebooted, the changes to the configuration database will be maintained. N redundant system, then one line card, for example, line card 16 nserves as the hardware backup card for at least two other line cards, for example, line cards 16 a and 16 b.
To add flexibility, however, MCD 38 assigns a PID even to the chassis, shelves and slots to allow the modular software architecture to be ported to another computer system with a different physical construction i. In the same computer system, the user may provide full redundancy 1: Beyond prior architectures, however, the modular software architecture removes significant application dependent data from the kernel and minimizes the link between software and hardware.