upgrading IOS image

[csanchez]

I have four routers that I want to upgrade with newer IOS and would like to know exactly how to tell how much memory, flash memory the routers have. I have seen the details under the 'sh ver" command but I am a little uncertain on how to interpret the output in regards to memory.

Thanks in advance.

Carlos

[a.mir]

In order to tell how much flash is in the router, its the output line with the board system flash and it reads as, which means the router/switch has 16megs of flash.

16384K bytes of processor board System flash (Read/Write)

For the DRAM. there are two parts once the main memory and the other part is the shared memory. the output line reads as

cisco 2651 (MPC860P) processor (revision 0x200) with 44032K/5120K bytes of memory.

which means you have about 49megs of total.

[csanchez]

So in consideration for ios upgrades minimum memory requirements, the total DRAM would be 49megs and not 44megs, correct?

[thisisshanky]

The sh version splits the memory count into system and interface memories, so the total memory available in the system is 44032 + 5120 = 49152 kbytes

49152 kbytes = 49152/1024 = 48 MB. So in the example output, the system memory is 48 Meg. So this can be the limit that you use to spec out what IOS is stored.

Also consider the amount of flash you have. This is where the IOS goes in.

[csanchez]

Thanks to everyone.

[thisisshanky]

"So this can be the limit that you use to spec out what IOS is stored" -- I really meant this statement to be "So this can be the limit that you can use to spec out the IOS to be downloaded from Cisco's website".