System Management Functions; Terms And Acronyms - Cisco NPE-175 Installation And Configuration Manual

NPE-300 and NPE-400 Description and Overview
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System Management Functions

The network processing engines perform the following system management functions:
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Terms and Acronyms

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Network Processing Engine and Network Services Engine Installation and Configuration
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Upgradable memory modules
The NPE-300 and NPE-400 use SDRAM for storing all packets received or sent from network
interfaces. The SDRAM also stores routing tables and network accounting applications.
– On the NPE-300, two independent SDRAM memory arrays in the system allow concurrent
access by port adapters and the processor; however, only one is upgradable.
On the NPE-400, one memory array is shared by port adapters and the processor.
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Cache memory
The NPE-300 and NPE-400 have cache SRAM that functions as the tertiary cache for the
microprocessor.
Two environmental sensors for monitoring the cooling air as it leaves the chassis for both the
NPE-300 and NPE-400
Boot ROM for storing sufficient code for booting the Cisco IOS software
The NPE-300 and the NPE-400 do not have packet SRAM.
Note
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)
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
Chapter 3 NPE-300 and NPE-400 Overview
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