appendix.
Replacing the System-Code SIMMs
The system code (router operating system software) is stored in Flash memory SIMMs.
Tools Required
You will need the following tools to remove and replace the system-code SIMMs on the router:
Medium-size flat-blade screwdriver (1/4 inch [0.625 cm])
●
ESD-preventive wrist strap●
System-code SIMM(s)●
Preparing to Install the System-Code SIMM
There are two system-code (Flash memory) SIMM sockets on the system board. If you want to install
system-code SIMMs in both sockets, the SIMMs must be the same size. For example, if a 4-MB system-code
SIMM is already installed in your router, the new SIMM must also be 4 MB. This upgrade would give you a
total of 8 MB. You can verify how much Flash memory is already installed in your router by entering the
show flash EXEC command.
Caution The system code is stored on the Flash memory SIMMs, but new system-code SIMMs are
shipped without preinstalled software. Before proceeding with this procedure, use the copy flash tftp
EXEC command to back up the system code to a TFTP server.
Note For more information about the copy flash tftp command and other related commands, refer to the Cisco
IOS configuration and command reference publications.
System-Code SIMM Replacement
Take the following steps to upgrade the system-code Flash memory SIMMs:
Step 1 If you have not already done so, enter the copy flash tftp EXEC command to back up the system code.
Step 2 Power OFF the router.
Step 3 Remove all cables from the rear panel of the router.
Step 4 Attach an ESD-preventive wrist or ankle strap.
Step 5 Open the chassis cover following the procedure in the section "Opening the Chassis" earlier in this
appendix.
Step 6 Locate the system-code SIMMs on the system card, labeled CODE0 and CODE1. (See Figure B-2.)
Step 7 If necessary, remove the existing system-code SIMM by pulling outward on the connector holders to
unlatch them. The connector holds the SIMM tightly, so be careful not to break the holders on the SIMM
connector. (See Figure B-4.)
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_fix/cis2500/2520/2520_23/c2520mnt.htm (5 of 7) [10/27/2000 3:08:02 PM]
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