Cisco Systems NPE-175, NPE-225 manual System Management Functions

Chapter 4 NSE-1 Overview

NSE-1 Description and Overview

•System controller

The system controller provides hardware logic to interconnect the processor, DRAM, and the PCI-based system backplane bus. The NSE-1 has one system controller that provides processor access to the two midplane and single I/O controller PCI buses. The system controller also allows port adapters—on either of the two midplane PCI buses—access to SDRAM.

•Upgradable memory modules

The NSE-1 uses SDRAM for providing code, data, and packet storage.

•Cache memory

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

•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

Note The NSE-1 does not have packet SRAM.

System Management Functions

The NSE-1 performs 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.

•OTP—one time programmable

Network Processing Engine and Network Services Engine Installation and Configuration

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