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CISCO UDI COMPONENTS SOFTWARE
To give you an idea of the latest features available with Cisco IOS, current releases offer the following software functionality: Feature sets may be identified as standard, enhanced, or advanced, depending on the services that are supported. You can select more than one feature set per release. This may also be an S (Service Provider) or E (Enterprise) train.Ī feature set is a package of the features that is offered in addition to the basic IOS functions of an IOS software release. T identifies the type of train release where T stands for Technology.(1) represents the release number, which increments with each new release of the mainline train.12.3 refers to the mainline train that will not be added to but will be subject to IOS bug fixes.For example, if you have a release named 12.3(1)T, the IOS version number breaks down as follows: With so many features and applications being offered with each release, a train identifier can further define a specific subset of features. When the IOS version has no train identifier, it is the mainline train. A train identifier determines whether a release is a Technology (T), Enterprise, or Service Provider (SP) release. Each release can be further defined by train identifiers. The major difference with Cat OS is the CLI commands that are used in conjunction with the operating system software.Ĭisco releases IOS software using what they call trains. Future chapters demonstrate the use of CLI commands on both network devices.Ī Cisco Catalyst switch may use either a Cat OS or Cisco IOS. The command-line interface (CLI) for routers and switches defines the commands that are used to communicate with the IOS.
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IOS software is installed on each Cisco router or switch and can accommodate network growth and provide for secure data transfers.
CISCO UDI COMPONENTS FULL
This is the configuration that is loaded when the machine is booted.Ĭisco IOS software is developed and maintained by Cisco to support a full array of system functions, applications (including Internet applications), and network hardware in a single software package. Nonvolatile random-access memory (NVRAM) stores the startup configuration. RAM also contains the running configuration or the active configuration that is used after a machine is booted. RAM contains the running IOS, with the exception of Run-From-Flash (RFF) routers.
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Because this type of memory is volatile, it is lost whenever the machine is shut down. At times, you may hear RAM also referred to as dynamic random-access memory (DRAM). This is the only type of system memory that is not permanent. Random-access memory (RAM) is used for short-term storage of a machine’s running IOS and running configuration. Like ROM, Flash is also nonvolatile memory. Configuration files may also be stored on a Flash card. The router uses Flash by default to locate the IOS when it is booted. Flash memory contains the Cisco Internetworking Operating System (IOS) image. ROM is nonvolatile, so data is not lost when the device is powered off.įlash is installed on either an electrically erasable, programmable, read-only memory (EEPROM) or Personal Computer Memory Card International Association (PCMCIA) card. Because this type of memory is read-only, it cannot be changed by any configuration done at the networking device.
CISCO UDI COMPONENTS CODE
Read-only memory (ROM) contains the basic code for booting a device and maintaining Power on Self Test (POST), ROM Monitor (ROMmon), bootstrap, and RXBOOT. Those components include ROM, Flash, RAM, and NVRAM. Describe the purpose and functions of various network devicesįour memory components are used by Cisco devices.Select the components required to meet a network specification.