Cisco 7246 - uBR Router Manuel complémentaire - Page 40
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SDRAM and DRAM Options for NPEs and the NSE
Compare the required processor memory identified in
Step 2
provided by each DRAM or SDRAM option listed in
Table 2-5
option available for Cisco 7200 series routers. The DRAM and SDRAM options available for
Cisco 7200 series routers are logically divided into processor memory (which is used by the system CPU
for instruction and data storage) and I/O memory (which is used for packet buffering). The amount of
processor memory available for each DRAM or SDRAM option determines the combination of installed
port adapter types that a Cisco 7200 series router can support.
Note
Choose a DRAM or SDRAM memory option.
Step 3
This completes the procedure for determining the minimum amount of DRAM or SDRAM required by
a Cisco 7200 series router to support a combination of installed port adapters and the Cisco IOS software
subset image.
For a sample configuration of a Cisco 7206 router that has an installed NPE-150, an I/O controller with
the Fast Ethernet port, and Cisco IOS software subset images for Cisco IOS Release 11.1CA and Cisco
IOS Release 12.0T, see
SDRAM and DRAM Options for NPEs and the NSE
The default memory allocation of total available memory between I/O memory and processor memory
is 25% to I/O memory and 75% to processor memory. However, I/O memory may be allocated manually
in amounts of 32 MB, 64 MB, 128 MB, or 256 MB, with the remainder going to processor memory.
Table 2-4
engines and the network services engine. Not all possible processor and I/O memory options are listed.
Table 2-4
SDRAM Options
1 GB
2 GB
Cisco 7200 Series Port Adapter Hardware Configuration Guidelines
2-6
through
Table 2-11
list the processor and I/O memory provided by each DRAM or SDRAM
For a DRAM or SDRAM option to support the installed port adapter types and Cisco IOS
software subset image, the required processor memory identified in
the amount of processor memory provided by the DRAM or SDRAM options listed in
Table 2-7
through
Table
2-11.
Table
2-2.
through
Table 2-11
provide SDRAM and DRAM memory options for network processing
SDRAM Options for the NPE-G2
Processor Memory
992 MB
960 MB
896 MB
768 MB
2016 MB
1984 MB
1920 MB
1792 MB
Chapter 2
Step 1
with the amount of processor memory
Table 2-5
through
Table
2-11.
Step 1
I/O Memory
32 MB
64 MB
128 MB
256 MB
32 MB
64 MB
128 MB
256 MB
Memory Requirements
must not exceed
OL-3875-11