Cisco Systems OL-2056-02 manual Dram SIMMs Used in Cisco 3620 and Cisco 3640 Routers

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Chapter 5 Installing Memory in the Router

Replacing DRAM and SDRAM

DRAM SIMMs (Used in Cisco 3620 and Cisco 3640 Routers)

This section describes how to upgrade DRAM single in-line memory modules (SIMMs) in Cisco 3620 and Cisco 3640 routers. You might need to upgrade the DRAM SIMMs for the following reasons:

•You upgraded the Cisco IOS feature set or release and it requires additional DRAM.

•The router maintains large routing tables or other memory-intensive features, such as spoofing or protocol translations.

The Cisco 3620 and Cisco 3640 routers each contain four 72-pin SIMM sockets (or banks) for DRAM. Each socket can be filled with a single 32-bit-wide, 72-pin DRAM SIMM. You can configure DRAM as a mixture of primary or 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.

To see how much memory is currently installed in the router, enter the show version command while the router is in the privileged EXEC mode (Router# prompt). Near the middle of the resulting output, a message similar to the following displays:

Cisco 3640(R4700) processor (revision 0x00) with 24576K/8192K bytes of memory.

This line shows how much memory is installed (in this example, 24576K/8192K). The first number represents primary memory and the second number represents shared memory.

You can configure DRAM to be either 32 or 64 bits wide. To use 64-bit mode, you must install DRAM SIMMs in pairs of the same size. Generally, basic software feature sets (such as IP) use 32-bit DRAM SIMMs and robust software feature sets (such as Enterprise) use 64-bit DRAM SIMMs.

Note In the Cisco 3620 router, DRAM supports 32-bit operation only, whereas in the Cisco 3640 router, DRAM supports either 32- or 64-bit operation.

Note In 32-bit mode, the router performs approximately 20 percent slower than when DRAM is configured for 64-bit mode operation.

Each SIMM socket corresponds to one bank of memory. Fill banks consecutively with no gaps; start filling banks from 0, and empty banks starting with 3. Bank 0 must always be filled first and emptied last.

Only certain combinations of DRAM SIMMs are permitted. These combinations are shown inTable 5-1for 32-bit configurations used in Cisco 3620 routers, Table 5-2for 32-bit configurations used in Cisco 3640 routers, and Table 5-3for 64-bit configurations used in Cisco 3640 routers.

Follow these rules to use 64-bit mode DRAM configuration:

•SIMMs in banks 0 and 1 must be the same size (in MB) and have the same access time (in nanoseconds).

•SIMMs in banks 2 and 3 must also be the same size and have the same access time.

•SIMMs in banks 2 and 3 must be less than or equal to the size of the SIMMs in banks 0 and 1. Figure 5-5or Figure 5-6shows the DRAM SIMM locations in your router.

Cisco 3600 Series Hardware Installation Guide

 

OL-2056-02

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Contents Installing Memory in the Router Removing the Cisco 3620 or Cisco 3640 Router Cover Accessing the MainboardRemoving the Cisco 3631 Router Cover Perform the following procedure to remove the chassis coverRemoving the Cisco 3631 Router Cover Lift cover Slide coverRemoving the Cisco 3660 Mainboard Tray Replacing Dram and Sdram Dram SIMMs Used in Cisco 3620 and Cisco 3640 Routers Dram Simm Locations in the Cisco 3620 Router 16 MB Bank Total Simm MemoryBank 0 Simm Total Memory Not installed 16 MB MB-Dual2 24 MB 32 MB 40 MB 48 MBDram Simm Dram Simm OrientationTop view Front of chassis Removing Dram SimmsRepeat through for each Simm Installing Dram SIMMsSdram DIMMs Used in the Cisco 3631 and Cisco 3660 Router Bank 0 Simm Bank 1 Simm Total Memory 64 MB Not installed 32 MB 96 MB 128 MB 160 MB 192 MB 256 MB11 Sdram Dimm Locations in the Cisco 3660 Router 12 Sdram Dimm Sdram Dimm OrientationRemoving Sdram Dimms 13 Removing and Installing Sdram DIMMsReplacing Flash Memory SIMMs Installing Sdram DIMMs12 MB Bank16 MB 20 MB 12 MB 24 MB 32 MB 64 MB 14 Flash Memory Simm Locations on the Cisco 3620 Mainboard 16 Flash Memory Simm Locations on the Cisco 3660 Mainboard Removing Flash Memory SIMMs17 Removing Flash Memory SIMMs Installing Flash Memory SIMMsCisco 3620, Cisco 3640, and Cisco Replacing the ROM19 ROM Location on the Cisco 3620 Mainboard Locate the ROM on the mainboard. See -19through Figure20 ROM Location on the Cisco 3640 Mainboard 22 Removing the ROM from the Cisco 3660 Mainboard Cisco Testing ROM InstallationVerify the ROM version Reboot the router using the new ROM imageSelect the ROM image for next reboot Router # upgrade rom-monitor preference readonly upgrade24 Replacing the Cisco 3620 Router Cover Replacing the Cover on a Cisco 3620 or Cisco 3640 RouterReplacing the Cover on a Cisco 3631 Router 26 Replacing the Cisco 3631 Router Cover Insert tabs and slide cover Close cover27 Replacing the Cisco 3660 Mainboard Tray Replacing the Cisco 3660 Mainboard TrayInstalling a Flash Memory Card 28 Setting the Write-Protect Switch 30 Installing a Flash Memory Card in a Cisco 3660 Router Removing a Flash Memory Card Partitioning a Flash Memory Card Enter global configuration modeRouter# configure terminal Routerconfig# partition slot1 1 2Displaying the Contents of a Flash Memory Card Router# copy running-config slot03myconfig Copying a Running Configuration File to a Flash Memory CardCopying a File Between Slots Enter privileged Exec mode as followsRouter# copy slot03TESTFILE flash2TESTFILE2 Router# copy slot03TESTFILE slot1 Booting from a Flash Memory CardErasing the Contents of a Flash Memory Card Tools and Equipment Needed Preventing Electrostatic Discharge DamageRemoving the Chassis Cover Compact Flash Memory Card Installation and RemovalRemoving the Cover from a Cisco Removing the Compact Flash Memory CardInstructions on formatting the Compact Flash memory card Installing the Compact Flash Memory CardReplacing the Cover on a Cisco Reinstalling the CoverDetermining the File System on a Compact Flash Memory Card Formatting Procedures for Compact Flash Memory CardsSafety Information document that accompanied this device ROM monitor to recognize and boot the FlashRouter# format flash CommandFormatting Compact Flash Memory as a DOS File System Class B Flash file systemFile Operations File and Directory ProceduresProcedures for Use with DOS File System Router# copy flashmy-config2 running-configDisplay Geometry and Format Information Display the Contents of a Compact Flash CardDelete Files from Compact Flash Memory Rename a File in Flash Display the Contents of a FileCreate a New Directory Directory OperationsRemove a Directory Enter a Directory and Determine Which Directory You Are Procedures for Use with Class B Flash File SystemDisplay the Contents of a Compact Flash Memory Card Router# more flashc3725-i-mz Router# squeeze flashOL-2056-02
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