5
Cisco 12000 Series Router Memory Replacement Instructions
78-4338-16
GRP, PRP, and Line Card Memory Overview
Note If your system includes redundant GRPs, both GRPs should have the same memory size. Redundancy is
not supported when using a GRP and a Performance Route Processor (PRP) in the same chassis. Refer
to the Route Processor Redundancy Plus for the Cisco 12000 Series Router publication for more
information.
PRP Route Memory
The processor on the PRP uses onboard SDRAM to perform several tasks for Cisco 12000 Series
Internet Routers, including the following:
• Running the Cisco IOS software image
• Storing and maintaining the network routing tables
• Loading the Cisco IOS software image into installed line cards
• Formatting and distributing updated routing tables to installed line cards
• Monitoring temperature and voltage alarm conditions of installed cards and shutting them down
when necessary
• Supporting a console port that enables you to configure the router using an attached terminal
• Participating in network routing protocols (together with other routers in the networking
environment) to update the router’s internal routing tables
Table 1 Route Memory Configurations Available for Cisco 12000 Series Router GRP
Total Route Memory
Ordered
1
1. Do not mix memory sizes. If installing 2 DIMMs, both DIMMs must be the same size.
Cisco Product Number DIMM Modules DRAM DIMM Sockets
64 MB MEM-GRP/LC-64=
2
2. For GRPs equipped with 64 MB, this option adds a second 64-MB DIMM for a total of 128 MB.
1 64-MB DIMM U39 or U42
128 MB MEM-GRP/LC-128= 1 128-MB DIMM U39
256 MB MEM-GRP/LC-256=
3
3. This product is no longer available. Replace it with Cisco Product Number MEM-GRP-256.
2 128-MB DIMMs U39 and U42
256 MB MEM-GRP-256=
4
4. Only compatible with Product Number GRP-B=.
1 256-MB DIMM U39
512 MB MEM-GRP-512=
5
5. GRP route memory configurations of 512 MB are only compatible with Product Number GRP-B=. Cisco IOS Release
12.0(19)S or 12.0(19)ST or later and ROMMON Release 11.2 (181) or later are also required
2 256-MB DIMMs U39 and U42
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