July 22, 2008
Upgrading Your Cisco Memory: A Primer
Upgrading your Cisco Memory: A Primer
Almost all advanced Cisco routers and switches are equipped with the Cisco proprietary operating systems called the IOS (Internetwork Operating System). Cisco PIX firewalls have a special operating system, the PIX Finesse OS.
The following is description of the different types of memory that used in a Cisco product.
Processor Memory
This memory acts similar to the CPU cache in a computer, controlling all basic computing operations of your switch or router. Regardless of any other memory being used, the processor memory is always the first memory that is accessed and used. All the files needed for booting and essential system files required for functioning for any Cisco device are stored in the processor memory.
Flash Memory Card/Disk or Cisco Memory Card
The flash memory is a special type of programmable memory that is used to store images of the IOS software on it, in addition the flash memory is used to upgrade versions of the router or switch being used. The term ‘flashing a product’ means upgrading the version of IOS stored on the flash memory card.
Shared Memory/RAM (Random Access Memory)
The reason this is often referred to as the shared memory, is that it is erased every time the router is restarted or when the memory is deliberately cleared. This memory is usually the easiest to upgrade. The RAM stores all data that is temporary in nature, and upgrading the RAM usually helps improve the speed and the computing power of the Cisco product. It is generally cheaper than Flash memory, and manufactured both OEM by Cisco and by third party manufacturers, such as PC Wholesale.
Just like conventional computers, increasing the memory of a Cisco product increases its speed. If the product is a Cisco router or switch that handles large amounts of data over the network, increasing the RAM of the product can improve both the processing speed and the device’s performance.
Upgrading the memory and IOS
Just like conventional computers, increasing the memory of a Cisco product increases its speed. If the product is a Cisco router or switch that handles large amounts of data over the network, increasing the RAM of the product can improve both the processing speed and the device’s performance.
For devices with Cisco IOS 11.1 or older the only way to improve its performance is to upgrade the IOS. However, older Cisco hardware is usually not equipped with sufficient flash memory to store a newer version of the IOS. In this case, the only option is to upgrade the flash memory of the Cisco product.
One great place to find Cisco memory upgrades is PC Wholesale. They carry a complete line of both Cisco Original/OEM and third party memory modules and Flash cards for every Cisco router, firewall, and switch, and have technical experts available by phone to answer any questions. Check out the Cisco Memory section to find your router or switch.
