Help about Memory of router?

[imran_mcse]

Hi dears, a basic question

My cisco 2522 shows 16384k/2048K

and Cisco 2610XM shows 28672K/4096K

Why memory is mentioned in this style like xxxxK/xxxK

How much memory my both routers will use?

[Kevin Dorrell · Accepted solution]

I think the behavior changed slightly between the 2500 series and the 2600 series.

In the 2500 series, your 16384k/2048K means that it has 16 Mb installed, of which 2 Mb is reserved for fast IO buffers. Fast IO buffers are sections of memory used directly by the interfaces to receive or transmit packets, and are handled mainly by interrupt code.

In the 2600 series, your 28672K/4096K neans it has 32 Mb installed, of which 4 Mb is reserved for fast IO buffers. That is, 28 Mb main memory and 4 Mb reserved IO memory.

In the 2500 series, the first figure is the total including the fast IO memory. In the 2600 series, the first figure excludes the fast IO memory.

Kevin Dorrell

Luxembourg

[amikat]

Hi,

I am sorry to say that the information presened here about Cisco 2500 series is to my knowledge incorrect.

For Cisco 2500 series the total amount (capacity) of memory installed is THE SUM of the two numbers, ie. for this particular example the total memory is 18MB NOT 16MB. The memory installed is reserved (automaticaly by the system) between the main (first number) and the shared (second number).

Do not feel confused about 18MB. Some Cisco 2500 series boxes were build with 2MB memory installed in board and further memory modules to be added via DRAM SIMM modules (16MB in this case).

Best regards,

Antonin

[imran_mcse]

uuuum,

So please anybody verify the antonin's reply,

Please verify it???

[mhussein]

I think Antonin is correct:

http://www.cisco.com/warp/public/63/arch_2500_5750.shtml#md

[Kevin Dorrell]

OK, sorry about that. Antonin is right. I forgot about the onboard DRAM. Here is the revised information:

The total is 18 Mb, 2 Mb on-board and 16 Mb on the SIMM. In this configutation, 16 Mb is main memory, and the on-board chip is reserved for the IO memory.

Without the SIMM, it uses 1 Mb main memory and 1 Mb for the IO. I guess in that case it would say 1024K/1024K.

Anyone who doesn't make any mistakes cannot learn. And I am learning fast, I hope!

Thank t'y'all.

Kevin Dorrell

Luxembourg