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Router Hardware Components
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ROM Monitor (ROMMON mode)
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A mini operating system that allows you to perform low-level testing and troubleshooting; for instance, ROMMON is used during the password recovery procedure To abort the router s normal bootup procedure of loading the IOS, use the CTRL-BREAK control sequence to enter ROMMON mode The prompt in ROMMON mode is either > or rommon>, depending on the router model A stripped-down version of the IOS that contains only IP code This should be used in emergency situations where the IOS image in flash can t be found and you want to boot up your router and load in another IOS image This stripped-down IOS is referred to as RXBOOT mode If you see Router(rxboot)# in your prompt, then your router has booted up with the ROM IOS image Not every router has a Mini-IOS image; on the other hand, some routers, such as the 7200, can store a full-blown IOS image here
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Mini-IOS
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RXBOOT mode, also known as Boot ROM mode, isn t part of newer routers and switches, such as the 1800 and 2600-1 series routers It does appear on older router models, such as the 2500 series
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POST performs selftests on the hardwareThe bootstrap program brings the router up and nds the IOS image ROMMON contains a mini operating system used for low-level
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testing and debuggingThe Mini-IOS is a stripped-down version of the IOS used for emergency booting of a router and is referred to as RXBOOT mode All of these components are stored in ROM
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Your router contains other components that are used during the bootup process, including RAM, flash, NVRAM, the configuration register, and the physical lines and interfaces The following paragraphs explain these components RAM is like the memory in your PC On a router, RAM (in most cases) contains the running IOS image, the active configuration file, any tables (including routing, ARP, and other tables), and internal buffers for temporarily storing information such as interface input and output buffers and logging messages The IOS is responsible for managing memory When you turn off your router, everything in RAM is erased
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16: Initial Router Con guration
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Flash is a form of nonvolatile memory in that when you turn the router off, the information stored in flash is not lost Routers store their IOS image in flash, but other information can also be stored here, such as a secondary configuration file Note that some lower end Cisco routers actually run the IOS directly from flash (not RAM) Flash is slower than RAM, a fact that can create performance issues NVRAM is like flash in that its contents are not erased when you turn off your router It is slightly different, though, in that it uses a battery to maintain the information when the Cisco device is turned off Routers (and switches) use NVRAM to store their configuration files The configuration register is a special register in the router that determines many of its bootup and running options, including how the router finds the IOS image and its configuration file The configuration uses a part of memory space in NVRAM As you will see later in this chapter, you can manipulate this register to affect how your router boots up You can also use the boot command to influence the location from which the IOS and configuration file are loaded (discussed in the Bootstrap Program section later) Every router has at least one line and one physical interface Lines or ports are typically used for management access; the console and auxiliary lines are examples Interfaces are used to move traffic through the router; they can include media types such as Ethernet, Fast Ethernet, serial, and others These interfaces can be used during the Flash is used to store bootup process you can have the bootstrap the operating system and NVRAM is program load the IOS from a remote Trivial used to store the con guration leThe File Transfer Protocol (TFTP) server (instead con guration register is used to determine of flash), assuming that you have a sufficient IP how the router will boot up configuration on your router
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