Datasheet

9
Upgrading System Memory, Internal Flash Memory, and Boot ROM in Cisco 2600 Series Routers
OL-5474-01
Upgrading DRAM
Procedure for Cisco 2691
This section describes how to upgrade synchronous dynamic random access memory (SDRAM) dual
in-line memory modules (DIMMs) in Cisco 2691 routers.
The Cisco 2691 router contains two 168-pin DIMM sockets for SDRAM. Each socket can be filled with
a single 64-bit-wide, 168-pin SDRAM DIMM; however, if you install only one DIMM, you must install
it in slot 0.
You can configure SDRAM as a mixture of main memory, which is reserved for the CPU, and shared
memory, which is used for data transmitted or received by modules and WAN interface cards. See
Figure 7 for DIMM locations.
To see how much memory is currently installed in the router, enter the show version command while the
router is in privileged EXEC mode (Router#). Near the middle of the resulting output, a message similar
to the following appears:
cisco 2691 (R7000) processor (revision 0.5) with 121856K/9216K bytes of memory.
This line shows how much memory is installed (in this example, 121856 Kb / 9216 Kb). The first number
represents primary memory, and the second number represents shared memory. Your router supports up
to 256 MB of SDRAM.
Note To use a 64-bit mode SDRAM configuration, the memory size of the DIMM in slot 1 must be less
than or equal to the memory size of the DIMM in slot 0.
Figure 7 SDRAM DIMM Locations in the Cisco 2691 Router
72012
Slot 0
Slot 1
SDRAM DIMMs