Resolving Cisco Inter-network Operating System Problems Through PC Support

Cisco Systems is a leading pioneer in designing and developing networking,communication,voice and consumer electronic devices. Inter-network Operating System(IOS) is a software package developed by Cisco for its hardware systems. It performs telecommunication,switching,routing and networking functions which are closely integrated with a multi-threading operating system. Command line interface(CLI) is used for human machine interaction. A fixed group of multiple word commands, which is determined by the mode and user privilege,is provided by Cisco. It also provides extensive tech support for IOS problems. Microprocessors Used By IOS Most of the Cisco hardware systems use microprocessors of different performances and capabilities depending on the hardware platform. Orion R4600 and Motorola 68030 processors are the most widely used ones. Making routing and bridging decisions,maintaining routing tables and handling system management functions are the main tasks of IOS. To perform all these functions, the microprocessor should have access to the system memory. System memory mapping should be done by an experienced PC support provider. Memory Types Required For IOS There are mainly four types of system memory used by IOS,namely Read Only Memory, Random Access Memory,Flash Memory and Non Volatile Random Access Memory. Each of these memories is used for different purposes. Read Only Memory(ROM) ROM could be either embedded on the microprocessor itself or placed separately from the microprocessor on the motherboard. As the name indicates, data could be only read from this type of memory, not written to it. Stored in the ROM,IOS software is invoked whenever the hardware is powered up. The size of the ROM should be decided by a tech support provider based on the IOS version size. Random Access Memory(RAM) RAM is the type of memory which retains the content only when it is powered up. The main objective of RAM is to store running data,used by the application software. In Cisco hardware systems,RAM holds IOS system buffers and tables for operational storage requirements. Flash Memory The Single Inline Memory Module(SIMM) contains the flash memory. It could be expanded using a PC card. The most common use of Flash memory is to store IOS software images. Apart from that, it is also used to store system information and configuration files. In some high end Cisco hardware systems, bootstrap software is stored in flash memory. The extension of Flash memory needs expertise which could be provided by a veteran Tech support provider. Non Volatile Random Access Memory (NVRAM) NVRAM is generally employed to store start up configuration. During the booting process, IOS accesses the configuration settings of the file and performs the system configuration. It is one of the fastest memories. IOS Architecture Switching and routing are two separate operations for all IOS versions. Routing, which is the core process of IOS, builds up the Routing Information Base(RIB). Information of the RIB is used to build the last IP Forwarding Table or Forwarding Information Base(FIB). FIB is utilized by the router for transferring information. In the routers, which employ Software Only Forwarding method, most of the traffic handling takes place at the Cisco Express Forwarding(CEF) or distributed CEF interrupt level. Because of this reason, IOS need not process a context switch to rout a data packet. In routers, where Hardware Only Forwarding method is used, IOS forms the FIB in software and transfers it to the forwarding hardware. Configuration of IOS should be done very carefully with the help of an experienced tech support provider. PC Support For IOS The logging,debugging,upgrading and reloading IOS need expertise and that is where tech support comes handy. Cisco itself provides strong PC support for IOS problems. Apart from Cisco, many third party vendors,such as IBM support and Dell support providers offer round the clock tech support to resolve the interface problems between router and the computer.