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Beginner

Functional Differences Between NVRAM & FLASH Memory

I know that Flash memory is used to store the images of the IOS and NVRAM is used to store the startup-config file. But when my net instructor asked me, "Why cannot you just save the startup configuration file in Flash?", I was not able to answer. If you know how to answer that question, please let me know :)  

I also would like to know functional differences between FLASH Memory and NVRAM. 

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VIP Advisor

Re: Functional Differences Between NVRAM & FLASH Memory

Some routers simular nvram with flash ... so flash is completely capabale of storing a text file (which is all the startup-config is).

 

nvram simply means it retains its contents when the power is removed.  nvram is often battery backed.

VIP Mentor

Re: Functional Differences Between NVRAM & FLASH Memory

Hi its not stored in flash because the router boots up from nvram not from flash , so the startup needs to be there or it will have no configuration when it loads , you can actually on certain models get it to boot from flash now

see this for differences between both
https://learningnetwork.cisco.com/thread/65751
Beginner

Re: Functional Differences Between NVRAM & FLASH Memory

I do know the differences between both. I want to know why startup configuration file is stored in NVRAM if it can be stored in Flash? This link shows the router's booting process: http://www.9tut.com/cisco-router-boot-sequence-tutorial
Why cannot router just load the IOS and get the startup configuration file in Flash memory?
VIP Mentor

Re: Functional Differences Between NVRAM & FLASH Memory

Why cannot router just load the IOS and get the startup configuration file in Flash memory?

 

You can these days you have the option to use both on some platforms , the option wasnt avialble originally it had to booted from nvram thats the way it was built and designed , flash is just a type of nvram basically same technology there both EEPROM 

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