9-2
Cisco 7500 Series Installation and Configuration Guide
OL-5008-03 B0
Chapter 9 Replacing DRAM on the Route Switch Processor
Upgrading or Replacing DRAM SIMMs on the RSP2
The system DRAM resides in up to four SIMM sockets in two memory banks, 0 and 1. The DRAM
SIMM sockets are U21 and U33 for bank 0, and U4 and U12 for bank 1. (See
Figure 9-1
.) The default
DRAM configuration is 16 MB (two 8-MB SIMMs in bank 0).
The total number of memory devices per SIMM differs for each manufacturer. The SIMMs in the
following illustrations are generic representations of the actual DRAM SIMMs for your RSP2. To ensure
that you are using the correct SIMMs, refer to the specific part or product numbers indicated by your
DRAM upgrade requirements. DRAM upgrades require the removal of the RSP2, so plan your DRAM
upgrade to minimize your system downtime.
The SIMM sockets use thumb tabs that are often used in PCs and other computer equipment. Each RSP2
SIMM socket has two metal retaining springs, one at each end. When a SIMM is fully seated in the
socket, the retaining springs snap over the ends of the SIMM to lock it in the socket.
To upgrade DRAM, you install SIMMs in one or two banks.
Table 9-1
lists the various configurations of
DRAM SIMMs that are available. Note which banks are used given the combinations of available SIMM
sizes and the maximum DRAM you require.
Note
Depending on your router configuration, your Cisco IOS software release might require more than 16
MB of DRAM for your RSP2. Upgrade your system DRAM based on your current configuration and this
potential requirement.
The RSP2 supports high system availability (HSA), which is a feature in Cisco IOS Release 11.1(4) or
later, allowing two RSP2s to be used simultaneously in a Cisco 7507 or Cisco 7513 router. Each RSP2
must have the same DRAM configuration, with 24 MB of DRAM as the required minimum. The
Cisco 7576 does not support HSA.
Caution
To prevent DRAM errors, each DRAM bank used must contain no fewer than two SIMMs of the same
type. You must install either two SIMMs in bank 0 or four SIMMs in bank 0 and bank 1.
Table 9-1
DRAM SIMM Configurations for the RSP1
DRAM Bank 0 Quantity
DRAM Bank 1 Quantity
Total DRAM
Product Numbers
U33 and U21
2 8-MB SIMMs U12 and U4
–
16 MB
MEM-RSP-16M
U33 and U21
2 8-MB SIMMs U12 and U4
2 4-MB SIMMs 24 MB
1
1.
The 24-MB DRAM configuration is the minimum requirement for the HSA feature. The DRAM is available as an 8-MB
upgrade to the standard 16-MB configuration by adding DRAM Product Number MEM-RSP-8M= (consisting of two 4-MB
DRAM SIMMs, for a total of 24 MB).
MEM-RSP-24M
U33 and U21
2 16-MB
SIMMs
U12 and U4
–
32 MB
2
2.
The 32-MB DRAM default configuration is the default for RSP2s shipped in a Cisco 7507 and Cisco 7513 router.
MEM-RSP-32M(=)
U33 and U21
2 32-MB
SIMMs
U12 and U4
–
64 MB
MEM-RSP-64M(=)
U33 and U21
2 32-MB
SIMMs
U12 and U4
2 32-MB
SIMMs
128 MB
MEM-RSP-128M(=
)
