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Table Of Contents
Determining Port Adapter and System Memory Requirements
Sample Configuration Showing Processor Memory Required
Cisco IOS Software Memory Requirements
SDRAM and DRAM Options for NPEs and the NSE
Memory Requirements
Depending on the circumstances, you might need to determine the amount of main memory (DRAM or SDRAM) required by your Cisco 7200 series router to support a combination of installed port adapter types and a specific Cisco IOS software subset image.
Note
The NPE-175, NPE-225, NPE-300, and NSE-1 use SDRAM DIMMs for main memory, whereas the NPE-100, NPE-150, and NPE-200 use DRAM SIMMs for main memory.
The NPE-400 uses a single SDRAM SODIMM for main memory.
The NPE-G1 uses two SDRAM SODIMMs for main memory.
The NPE-G2 uses a single SDRAM DIMM for main memory.This chapter contains the following sections:
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Determining Port Adapter and System Memory Requirements
Table 2-1 Initial Memory Requirement Guidelines
What determines the amount of SDRAM or DRAM memory required?
The DRAM or SDRAM required by a Cisco 7200 series router to support a combination of installed port adapter types and a Cisco IOS software subset image is influenced by such variables as the features in the software you plan to use and the size of your network.
Where can I find Cisco IOS memory requirements?
Cisco IOS memory requirements are listed in the Cisco IOS Release Notes. The SDRAM column provides processor memory information. Flash memory recommendations are also included. For Cisco IOS Release Notes, see the documentation page for Cisco IOS Software Configuration.
If you are a registered user on Cisco.com, you can access the Software Advisor at http://www.cisco.com/cgi-bin/Support/CompNav/Index.pl to get memory requirements.
Sample Configuration Showing Processor Memory Required
Use the example in Table 2-2 to familiarize yourself with the criteria for determining processor memory required for your configuration. Then use the worksheet in Table 2-3 to determine the processor memory required for your configuration.
Table 2-2 Sample Configuration (Cisco 7206 Router with an NPE-150 Installed)
Network Layer 3 Switching
11.5 MB1 or
22.0 MB2
1 Fast Ethernet port on the I/O controller
0.10 MB3
1 full-duplex multimode FDDI
0.10 MB3
1 high-speed serial
0.10 MB3
1 4-port Token Ring half-duplex
0.30 MB3
2 2-port channelized T1/PRI ISDN
1 2-port channelized T1 PRI/ISDN
1.80 MB3
18.7 MB or
29.2 MB
32 MB or
64 MB
1 Specific to Cisco IOS Release 11.1CA.
2 Specific to Cisco IOS Release 12.0T.
3 Specific to Cisco IOS Release 11.1CA, Release 11.1CC, Release 11.2P, Release 11.3T, Release 11.3AA, and Release 12.0 .
4 Additional processor memory required for ISDN functionality.
Table 2-3 Worksheet for Various Hardware and Software Memory Requirements
MB or
MB
MB or
MB
1 See Cisco IOS Release Notes (listed under specific Cisco IOS releases) for memory requirements,
Cisco IOS Software Memory Requirements
Cisco IOS memory requirements are listed in the Cisco IOS Release Notes. The SDRAM column provides processor memory information. Flash memory recommendations are also included. For Cisco IOS Release Notes, see the documentation page for Cisco IOS software configuration.
Step 1
Step 2
Step 3
Step 4
Determining DRAM or SDRAM Required If the Router
Has Only 32 MB of Memory (NPE-100, NPE-150, and NPE-200)This section is applicable only to the NPE-100, NPE-150, and NPE-200.
To determine the minimum amount of DRAM or SDRAM required by a Cisco 7200 series router to support a combination of installed port adapter types and a Cisco IOS software subset image, complete the following steps only if your Cisco 7200 series router has 32 MB of DRAM or SDRAM.
If your Cisco 7200 series router has 64 MB or more of DRAM or SDRAM installed, you have enough memory to support any combination of installed port adapter types and Cisco IOS software subset images.
Note
Note
If you need assistance when determining DRAM or SDRAM requirements for your Cisco 7200 series router, contact the Cisco Technical Assistance Center (TAC). See the "Obtaining Documentation, Obtaining Support, and Security Guidelines" section on page vii for information on contacting TAC.
Tip
Step 1
Table 1-6 lists the processor memory required for the port adapter types available for use in Cisco 7200 series routers. Port adapters available for use in Cisco 7200 series routers require a minimum amount of processor memory to function properly in the routers. The amount of processor memory required by a port adapter depends on the number of interfaces or channels the port adapter provides.
Note
For DRAM and Flash memory requirements for your Cisco IOS release and platform, see Cisco IOS Release Notes at Cisco IOS Software Information: http://www.cisco.com/univercd/cc/td/doc/product/software/index.htm.
The amount of processor memory listed in Table 2-5 through Table 2-11 is for the static size of the image and some default data memory the image requires at system startup.
Step 2
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
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 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 2-5 SDRAM Options for the NPE-G1
256 MB
240 MB
16 MB
512 MB
480 MB
32 MB
1 GB
992 MB
32 MB
Table 2-6 SDRAM Options for the NSE-1
128 MB
116 MB
12 MB
256 MB
240 MB
16 MB
Table 2-7 SDRAM Options for the NPE-400
128 MB
112 MB
16 MB
256 MB
240 MB
16 MB
512 MB
480 MB
32 MB
Table 2-8 SDRAM Options for the NPE-300
64 MB
28 MB
36 MB
96 MB
60 MB
36 MB
160 MB
120 MB
40 MB
288 MB
248 MB
40 MB
Table 2-9 SDRAM Options for the NPE-225
64 MB
56 MB
8 MB
128 MB
116 MB
12 MB
256 MB
240 MB
16 MB
Table 2-10 SDRAM Options for the NPE-175
64 MB
56 MB
8 MB
128 MB
116 MB
12 MB
Table 2-11 DRAM Options for the NPE-100, NPE-150, and NPE-200
32 MB
26 MB
6 MB
26 MB
7 MB
26 MB
10 MB
64 MB
56 MB
8 MB
56 MB
9 MB
56 MB
12 MB
128 MB
120 MB
8 MB
120 MB
9 MB
120 MB
12 MB3
1 The I/O memory for the NPE-150 DRAM options includes 1 MB of packet SRAM.
2 The I/O memory for the NPE-200 DRAM options includes 4 MB of packet SRAM.
3 For Cisco 7206 router shelf memory requirements, refer to the Cisco AS5800 Universal Access Server documentation at http://www.cisco.com/univercd/cc/td/doc/product/access/acs_serv/as5800/index.htm.
