Cisco Systems 7200 VXR manual 1-13, Cache memory

Chapter 1 Cisco 7200 VXR Product Overview

Field-Replaceable Units

The NPE-150 has 1 MB of SRAM and the NPE-200 has 4 MB of SRAM. No other network processing engine or network services engine has SRAM.

•Cache memory

–The NPE-G2 has two levels of cache: a primary and a secondary cache that are internal to the microprocessor, with the secondary unified cache for data and instruction.

–The NPE-G1 has two levels of cache: a primary and a secondary cache that are internal to the microprocessor, with the secondary unified cache for data and instruction.

–The NSE-1 has three levels of cache: a primary and a secondary unified cache that are internal to the microprocessor, and a tertiary 2-MB external cache.

–The NPE-400 has three levels of cache: a primary and a secondary cache that are internal to the microprocessor, and a tertiary 4-MB external cache that provides additional high-speed storage for data and instructions.

–The NPE-300 has three levels of cache: a primary and a secondary cache that are internal to the microprocessor, and a tertiary 2-MB external cache that provides additional high-speed storage for data and instructions.

–The NPE-225 has two levels of cache: a primary cache that is internal to the processor and a secondary 2-MB external cache that provides additional high-speed storage for data and instructions.

–The NPE-200 has unified cache SRAM that functions as the secondary cache for the microprocessor. (The primary cache is within the microprocessor.)

–The NPE-175 has two levels of cache: a primary cache that is internal to the processor and a secondary 2-MB external cache that provides additional high-speed storage for data and instructions.

–The NPE-150 has unified cache SRAM that functions as the secondary cache for the microprocessor. (The primary cache is within the microprocessor.)

–The NPE-100 has unified cache SRAM that functions as the secondary cache for the microprocessor. (The primary cache is within the microprocessor.)

•Two environmental sensors for monitoring the cooling air as it leaves the chassis

•Boot ROM for storing sufficient code for booting the Cisco IOS software; the NPE-G2, NPE-G1, NSE-1, NPE-400, NPE-300, NPE-225, NPE-200, and NPE-175 have boot ROM.

The network processing engines and network services engine perform the following system management functions:

•Sending and receiving routing protocol updates

•Managing tables, caches, and buffers

•Monitoring interface and environmental status

•Providing Simple Network Management Protocol (SNMP) management through the console and Telnet interface

•Accounting for and switching of data traffic

•Booting and reloading images

•Managing port adapters (recognition and initialization during online insertion and removal) The following figures and memory tables provide information about your NPE or NSE:

•NPE-G2 is represented by Figure 1-5. Table 1-2lists NPE-G2 memory specifications, and Table 1-3lists memory configurations.

Cisco 7200 VXR Installation and Configuration Guide

OL-5013-09 1-13