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How to determine physical RAM installed in Cisco ISR 4000 IOS-XE

What command can be used to determine the amount of physical RAM installed in a Cisco ISR 4000 router running IOS-XE 16.9.x?

router

I have a number of 4400 and 4300 routers and am trying to determine how much physical RAM is installed in each. This is proving to be amazingly more complicated than I thought. This document is not clear, as it says to use "show vesion" which is clearly not right based on the output I am seeing below.

 

https://www.cisco.com/c/en/us/td/docs/routers/access/4400/troubleshooting/memorytroubleshooting/isr4000_mem.html

 

They all show the same output for "show version", which is what the document says to use to determine physical RAM. For example, the following 4451 has 16GB physical RAM, while the 4331 has 4GB physical RAM.

Router# show version
<snip>

cisco ISR4451-X/K9 (2RU) processor with 1784318K/6147K bytes of memory.
Processor board ID XXXXXXXXXXXX.
4 Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
7341807K bytes of flash memory at bootflash:

 

Router# show version
<snip>

cisco ISR4331/K9 (1RU) processor with 1784318K/6147K bytes of memory.
Processor board ID XXXXXXXXXXX. 1687854K is the maximum IOSD memory.
3 Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
3207167K bytes of flash memory at bootflash:

 

 

3 REPLIES 3
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Hall of Fame Community Legend


@ryan-hitch wrote:

cisco ISR4451-X/K9 (2RU) processor with 1784318K/6147K bytes of memory.


DRAM = 2Gb


@ryan-hitch wrote:

7341807K bytes of flash memory at bootflash:


Flash = 8 Gb

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Incorrect. I have hundreds of ISR 4000s that all list the same line for RAM:

cisco ISR4XXX (XRU) processor with 1784318K/6147K bytes of memory.

 

Some of them have 16GB, some have 8GB, some have 4GB of physical memory, but this line is the same.

This appears to be the amount of RAM that IOSd has reserved from the installed physical memory.

 

I am trying to query the actually installed physical memory.

 

 

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Rising star

This may be closed but wanted to share the info. Ran into similar situation and TAC confirmed that ‘physical memory’ is the DRAM size but not processor memory.

 

hth

MS

 

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