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Upgrading GRP Memory
78-4339-09
Implementing Additional Configuration and Maintenance Tasks
Note Each GRP DIMM socket has one plastic lever on one end, which you use to remove the DIMM from
its socket. (See Figure 16.)
Before proceeding, ensure that you have the proper tools and ESD-prevention equipment available. To
upgrade DRAM, you will install DIMMs in one or two banks (U39 and U42). Table 14 lists the various
available configurations of DRAM DIMMs, the number of DIMMs for each configuration, and the
DRAM banks they occupy. Note which banks you should use, given the combinations of available
DIMM sizes and the maximum DRAM you require.
Note Depending on your router’s configuration and the protocols and features your system is running, you
might require more than 128 MB of DRAM. Upgrade your system DRAM based on your current
configuration, this potential requirement, and the information in Table 14.
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 PRP in the same chassis. Cisco strongly recommends that
you avoid configuring your router using mixed route processor cards. Refer to the Route Processor
Redundancy Plus for the Cisco 12000 Series Internet Router publication for more information on
redundancy.
Caution To prevent system and memory problems when installing DRAM, make sure that the card’s DRAM
DIMMS are +3.3VDC, 60-ns, EDO devices. Do not attempt to install other DRAM devices in the
GRPs DIMM sockets.
Table 14 GRP Memory Options
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=. In addition, 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