Filter
Top Products
show version
CF-924
Cisco IOS Configuration Fundamentals Command Reference
July 2008
Cisco platform (processor-type)
processor (revision
processor-revision-id) with
free-DRAM-memory K/
packet-memory K bytes of
memory.
Example—Separate DRAM and
Packet Memory:
Cisco RSP4 (R5000) processor
with 65536K/2072K bytes of
memory
Example—Combined DRAM
and Packet Memory:
Cisco 3660 (R527x) processor
(revision 1.0) with
57344K/8192K bytes of
memory.
This line can be used to determine how much Dynamic RAM
(DRAM) is installed on your system, in order to determine if you
meet the “Min. Memory” requirement for a software image. DRAM
(including SDRAM) is used for system processing memory and for
packet memory.
Two values, separated by a slash, are given for DRAM: The first
value tells you how DRAM is available for system processing, and
the second value tells you how much DRAM is being used for
Packet memory.
The first value, Main Processor memory, is either:
• The amount of DRAM available for the processor, or
• The total amount of DRAM installed on the system.
The second value, Packet memory, is either:
• The total physical input/output (I/O) memory (or “Fast
memory”) installed on the router (Cisco 4000, 4500, 4700, and
7500 series), or
• The amount of “shared memory” used for packet buffering. In
the shared memory scheme (Cisco 2500, 2600, 3600, and 7200
Series), a percentage of DRAM is used for packet buffering by
the router's network interfaces.
Note The terms “I/O memory” or “iomem”; “shared memory”;
“Fast memory” and “PCI memory” all refer to “Packet
Memory”. Packet memory is either separate physical RAM
or shared DRAM.
Separate DRAM and Packet Memory
The 4000, 4500, 4700, and 7500 series routers have separate
DRAM and Packet memory, so you only need to look at the first
number to determine total DRAM. In the example to the left for the
Cisco RSP4, the first value shows that the router has 65536K
(65,536 kilobytes, or 64 megabytes) of DRAM. The second value,
8192K, is the Packet memory.
Combined DRAM and Packet Memory
The 2500, 2600, 3600, and 7200 series routers require a minimum
amount of I/O memory to support certain interface processors.
The 1600, 2500, 2600, 3600, and 7200 series 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 the example to the left for the
Cisco 3660, the router has 57,344 kilobytes (KB) of free DRAM
and 8,192 KB dedicated to Packet memory. Adding the two
numbers together gives you 57,344K + 8,192K = 65,536K, or 64
megabytes (MB) of DRAM.
Table 146 show version Field Descriptions (continued)
Field Description