There are few things you need to know first before you upgrade the memory of your Cisco Router such as:
- Check the hardware spec sheet of your Router for compatibility - Make sure you got the right memory and did your research of what sort of RAM the router takes.
- Maximum of memory it can support - The maximum of RAM it can support there is no point buying stupid amount of RAM and the router doesn't work.
- How to work safety (yeah right :) we all know how to do this ha) - turn power off, unplug power cable, anti-wrist band and etc...
- Order your memory - Got mine from eBay, easiest place to find and get one. Usually when you search for the right name of the router's memory and eBay should return you with the right items so it matches the router you are looking for to upgrade. For example, search on eBay "Cisco router 1841 memory".
In my case was to upgrade to latest IOS and the current router does not have enough memory to support it. I recommended you to check out the Cisco memory recommendations table at below.
Cisco 1841 through 1861 Feature Sets and Memory Recommendation
Table 2 lists the Cisco IOS Software Release 15.0 feature sets that are available for the Cisco 1841 and 1861 Integrated Services Routers. Note that the flash memory recommendations given in the table are calculated without added management tools such as Cisco Configuration Professional.
Table 2. Cisco 1841 and 1861 Integrated Services Routers with Cisco IOS Software Release 15.0 Feature Set Memory Recommendations
The Fun Part - Most of us like to take things apart!To do memory upgrade for a Cisco router it just easy as open a tin of beans :) well depends of what brand it is!
In this guide we will be using a flat and Philip/cross screwdriver.
1. Flip over the router
2. Undo the screw located at the top middle with a cross screwdriver.
3. Get a flat screwdriver and gently push the casing out
4. You should be able to pull the casing straight out with your hands once you have enough space between the casing.
5. Locate the memory slot and insert the new memory in to it.
6. Push the memory down to secure it.
7. Overview look of the Cisco router hardware.
8. Do the reverse way of opening it to complete the installation upgrade.
For more information, please visit Cisco website.