Cisco Systems NPE-225 Manual De Usuario

Boot ROM for storing sufficient code for booting the Cisco IOS software; the NPE-175 and 
NPE-225 have boot ROM

Neither the NPE-175 nor the NPE-225 has packet SRAM.

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)

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

Primary, secondary, tertiary cache—Hierarchical cache memory storage based on the proximity of 
the cache to the core of the processor. Primary cache is closest to the processor core and has the 
fastest access. Secondary cache has slower access than primary cache, but faster access than tertiary 
cache. 

RAM—random-access memory 

RISC—reduced instruction set computing

ROM—read-only memory

SIMM—single in-line memory module

SDRAM—synchronous dynamic random-access memory

SDRAM-fixed—SDRAM of a fixed size or quantity; can be replaced, but not upgraded

SODIMM—small outline dual in-line memory module