Reading DRAM memory configuration

tj6512 · ‎01-13-2002

Can anyone please tell me how to interpret the memory configuration for different router platform ? I know that there is a document that talks about this. But, I already cannot locate this document.

rokibbe · ‎01-14-2002

The command you're looking for is SHOW VERSION. http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/fun_r/frprt2/frd2005.htm#xtocid32814

On the line that describes the processor is listed the amount of memory [DRAM] the router has. It's listed as main/shared memory. To find the total amount of physical DRAM in the router, add the two numbers (main + shared) together. In the example noted above, the relevant line is:

cisco 7206 (NPE150) processor with 57344K/8192K bytes of memory.

R4700 processor, Implementation 33, Revision 1.0 (512KB Level 2 Cache)

The Main memory is 57344K and the Shared is 8192K.

57344K + 8192K = 65536K or 64 megs of physical DRAM.

tj6512 · ‎01-14-2002

Dear Rokibbe,

Thanks for your prompt reply. Yes, I already knew the command. But, for different router platform, they will have different interpretation of the memory configuration for main/shared. For example, for Cisco 4500 :

GlenMarie#sh ver

Cisco Internetwork Operating System Software

IOS (tm) 4500 Software (C4500-I-M), Version 12.0(3)T, RELEASE SOFTWARE (fc1)

Compiled Tue 23-Feb-99 03:51 by ccai

Image text-base: 0x60008908, data-base: 0x60768000

ROM: System Bootstrap, Version 5.2(7b) [mkamson 7b], RELEASE SOFTWARE (fc1)

BOOTFLASH: 4500 Software (C4500-BOOT-M), Version 12.0(3)T, RELEASE SOFTWARE (fc

1)

GlenMarie uptime is 2 weeks, 22 hours, 52 minutes

System restarted by power-on

System image file is "flash:c4500-i-mz.120-3.T.bin"

cisco 4500 (R4K) processor (revision D) with 16384K/4096K bytes of memory.

Processor board ID 04676272

R4700 CPU at 100Mhz, Implementation 33, Rev 1.0

G.703/E1 software, Version 1.0.

Bridging software.

X.25 software, Version 3.0.0.

2 Ethernet/IEEE 802.3 interface(s)

1 FastEthernet/IEEE 802.3 interface(s)

4 Serial network interface(s)

128K bytes of non-volatile configuration memory.

4096K bytes of processor board System flash (Read/Write)

4096K bytes of processor board Boot flash (Read/Write)

Configuration register is 0x2102

The total physical DRAM memory is 16384K and the Shared memory is 4096K.

The main memory = 16384K - 4096K = 12288K or 12 megs.

So, can you please help me to find out which are router platforms that use the memory calculation like 72xx and which are the ones that use the memory calculatino like 4500. I am very sure that there is a documentation on this, but, I just could not find it anymore. Please help, I know you can !!! :-)

tj6512 · ‎01-30-2002

Memory Requirements

Before installing a new Cisco IOS Software image on your router, check if your router meets the memory requirements for that image. To do this, issue the show version command on your router, and look for the following lines:

...

cisco RSP4 (R5000) processor with 65536K/2072K bytes of memory

...

16384K bytes of processor board System flash (Read ONLY)

The first line tells you how much Dynamic RAM (DRAM) and Packet memory are installed in your router. Some platforms use a fraction of their DRAM as Packet memory. The memory requirements take this into account, so you have to add both numbers to find the amount of DRAM available on your router (from a memory requirement point of view).

Example 1: Separate DRAM and Packet Memory

...

cisco RSP4 (R5000) processor with 65536K/2072K bytes of memory

...

The 4000, 4500, 4700, and 7500 routers have separate DRAM and Packet memory, so you only need to look at the first number. This shows that the router has 65536K (or 64M) of DRAM.

Example 2: Combined DRAM and Packet Memory

...

cisco 2611 (MPC860) processor (revision 0x202) with 29696K/3072K bytes of memory

...

The 1000, 1600, 2500, 2600, 3600, and 7200 routers use a fraction of DRAM as Packet memory, so you need to add both numbers to find out the real amount of DRAM. In this example, the router has 29696K + 3072K = 32768K (or 32M) of DRAM.

tj6512 · ‎01-30-2002

Memory Requirements

Before installing a new Cisco IOS Software image on your router, check if your router meets the memory requirements for that image. To do this, issue the show version command on your router, and look for the following lines:

...

cisco RSP4 (R5000) processor with 65536K/2072K bytes of memory

...

16384K bytes of processor board System flash (Read ONLY)

The first line tells you how much Dynamic RAM (DRAM) and Packet memory are installed in your router. Some platforms use a fraction of their DRAM as Packet memory. The memory requirements take this into account, so you have to add both numbers to find the amount of DRAM available on your router (from a memory requirement point of view).

Example 1: Separate DRAM and Packet Memory

...

cisco RSP4 (R5000) processor with 65536K/2072K bytes of memory

...

The 4000, 4500, 4700, and 7500 routers have separate DRAM and Packet memory, so you only need to look at the first number. This shows that the router has 65536K (or 64M) of DRAM.

Example 2: Combined DRAM and Packet Memory

...

cisco 2611 (MPC860) processor (revision 0x202) with 29696K/3072K bytes of memory

...

The 1000, 1600, 2500, 2600, 3600, and 7200 routers use a fraction of DRAM as Packet memory, so you need to add both numbers to find out the real amount of DRAM. In this example, the router has 29696K + 3072K = 32768K (or 32M) of DRAM.