![]() There are at least two main pieces of non-volatile storage in a Cisco router. In Recipe 1.11 and Recipe 1.12, we discuss ways to erase single files on some types of routers, depending on the type of file-system used. This is an important feature for routers, because you don’t always want to erase the entire storage medium in order to erase a single file. But there is a key difference between EEPROM and flash memory: when you erase something from an EEPROM device, you must erase the entire device, while flash devices allow selective deletion of parts of the medium. EEPROM, on the other hand, can be erased by simply sending an erase signal to the chip. EPROM is not suitable for routers because it generally requires an external device such as an ultraviolet light shone through a window on the chip to erase it. There are other types of non-volatile solid state storage, such as Erasable Programmable Read Only Memory (EPROM) and Electronically Erasable Programmable Read Only Memory (EEPROM). And, unlike Read Only Memory (ROM), you can erase and rewrite flash easily. ![]() Flash also has the important benefit that it tends to be more reliable than disk storage.įlash storage is similar to Random Access Memory (RAM), but it doesn’t need power to retain information, so it is called non-volatile. Flash storage media is significantly more expensive and slower than disk storage, but the amount of storage needed to run a router is relatively small compared to the amount needed to run a general-purpose computer. This includes managing your router’s filesystems, upgrading the operating system, doing backups, and restoring the system configuration.Ĭisco routers use flash memory, rather than disks, for storing information. ![]() So we’ll start with a discussion of the basic system administration functions that a router engineer must perform. It has its own operating system, which is called the Internetwork Operating System (IOS), as well as files and filesystems. ![]() You can think of a Cisco router as a special-purpose computer. ![]()
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