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Router RAM usage



i have a Question to Router RAM usage.

My Router have 512MB of Memory.
When i do a "show version" I get this otput:

Cisco ********* processor with 491520K/32768K bytes of memory.

This means 491MB for CPU and 32MB for IO.

Now i do a "show memory" and get this output:

                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   6353EB60   430707644    14276428   416431216   416363448   413930428
      I/O    E000000    33554432     1884520    31669912    31669912    31669884

Now here are only 430MB Total RAM for the Processor. Why this? What is with the other 60MB Memory? How does these values are in context with the Output of a  "show region"?

Region Manager:

      Start         End     Size(b)  Class  Media  Name
0x0E000000  0x0FFFFFFF    33554432  Iomem  R/W    iomem
0x60000000  0x7DFFFFFF   503316480  Local  R/W    main
0x60008EF8  0x6204F18B    33841812  IText  R/O    main:text
0x62050000  0x6303FE1F    16711200  IData  R/W    main:data
0x6303FE20  0x6353EB5F     5238080  IBss   R/W    main:bss
0x6353EB60  0x6453EB5F    16777216  Local  R/W    main:heap
0x7D000000  0x7DFFFFFF    16777216  Local  R/W    main:heap
0x7E000000  0x7FFFFFFF    33554432  Iomem  R/W    iomem:(iomem_cwt)
0x80000000  0x8DFFFFFF   234881024  Local  R/W    main:(main_k0)
0xA0000000  0xADFFFFFF   234881024  Local  R/W    main:(main_k1)

Thank in advance

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