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We recently bought an ASR1006, and we have been told it has 16GB DRAM memory, but I am little confused by the show version output, e.g. processor with 9964723K/6147K bytes of memory, which is showing 9G memory.

What is 16777216K bytes of physical memory. in the following output then?

cisco ASR1006 (RP2) processor with 9964723K/6147K bytes of memory.
Processor board ID FXS1846Q06D
4 Ten Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
16777216K bytes of physical memory.
1933311K bytes of eUSB flash at bootflash:.
78085207K bytes of SATA hard disk at harddisk:.
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16777216K is 16 GB of DRAM. Your ASR1006 has 16 GB of DRAM installed.

For the processor with 9964723K/6147K bytes of memory, the first number is the amount of memory available to software processes, or process memory. The second number is the amount which has been allocated for I/O memory (interface buffers). On the ASR1000 series, the two numbers don't add up to the total DRAM, as they do on many of the routers, because the IOS is running as a process under a Linux kernel.

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