Cisco Systems NPE-175, NPE-225 manual System Management Functions, Terms and Acronyms

Chapter 1 NPE-100, NPE-150, and NPE-200 Overview

NPE-100, NPE-150, and NPE-200 Description and Overview

•Upgradable memory modules

The NPE-100, NPE-150, and NPE-200 use DRAM for storing routing tables, network accounting applications, packets of information in preparation for process switching, and packet buffering for SRAM overflow (except in the NPE-100, which contains no packet SRAM). The standard configuration is 32 MB, with up to 128 MB available through single in-line memory module (SIMM) upgrades.

•Packet SRAM for storing data packets

–The NPE-100 does not have packet SRAM.

–The NPE-150 has 1 MB of SRAM.

–The NPE-200 has 4 MB of SRAM.

•Cache memory

The NPE-100, NPE-150, and NPE-200 have 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 on the NPE-200

Note The NPE-100 and NPE-150 use the boot ROM on the I/O controller.

System Management Functions

The network processing engines 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 (including recognition and initialization during online insertion and removal)

Terms and Acronyms

•Cache—Memory with fast access and small capacity used to temporarily store recently accessed data; found either incorporated into the processor or near it.

•DIMM—dual in-line memory module

•DRAM—dynamic random-access memory

•Instruction and data cache—Instructions to the processor, and data on which the instructions work.

•Integrated cache—Cache that is built into the processor; sometimes referred to as internal cache. Cache memory physically located outside the processor is not integrated, and is sometimes referred to as external cache.

Network Processing Engine and Network Services Engine Installation and Configuration

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