Cisco 7206VXR Hardware Guide - Page 40

SDRAM and DRAM Options for NPEs and the NSE Chapter 2 Memory Requirements Step 2 Compare the required processor memory identified in Step 1 with the amount of processor memory provided by each DRAM or SDRAM option listed in Table 2-5 through Table 2-11. Table 2-5 through Table 2-11 list the processor and I/O memory provided by each DRAM or SDRAM 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 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 Step 1 must not exceed the amount of processor memory provided by the DRAM or SDRAM options listed in Table 2-7 through Table 2-11. Step 3 Choose a DRAM or SDRAM memory option. 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 Table 2-2. 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 through Table 2-11 provide SDRAM and DRAM memory options for network processing engines and the network services engine. Not all possible processor and I/O memory options are listed. Table 2-4 SDRAM Options for the NPE-G2 SDRAM Options 1 GB 2 GB Processor Memory 992 MB 960 MB 896 MB 768 MB 2016 MB 1984 MB 1920 MB 1792 MB I/O Memory 32 MB 64 MB 128 MB 256 MB 32 MB 64 MB 128 MB 256 MB Cisco 7200 Series Port Adapter Hardware Configuration Guidelines 2-6 OL-3875-11