Cisco Systems NPE-225 사용자 설명서
1-5
Network Processing Engine and Network Services Engine Installation and Configuration
OL-4448-12
Chapter 1 NPE-100, NPE-150, and NPE-200 Overview
NPE-100, NPE-150, and NPE-200 Description and Overview
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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.
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.
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Packet SRAM for storing data packets
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The NPE-100 does not have packet SRAM.
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The NPE-150 has 1 MB of SRAM.
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The NPE-200 has 4 MB of SRAM.
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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.)
cache for the microprocessor. (The primary cache is within the microprocessor.)
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Two environmental sensors for monitoring the cooling air as it leaves the chassis
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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:
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Sending and receiving routing protocol updates
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Managing tables, caches, and buffers
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Monitoring interface and environmental status
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Providing Simple Network Management Protocol (SNMP) management through the console and
Telnet interface
Telnet interface
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Accounting for and switching of data traffic
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Booting and reloading images
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Managing port adapters (including recognition and initialization during online insertion and
removal)
removal)
Terms and Acronyms
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Cache—Memory with fast access and small capacity used to temporarily store recently accessed
data; found either incorporated into the processor or near it.
data; found either incorporated into the processor or near it.
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DIMM—dual in-line memory module
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DRAM—dynamic random-access memory
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Instruction and data cache—Instructions to the processor, and data on which the instructions work.
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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.
Cache memory physically located outside the processor is not integrated, and is sometimes referred
to as external cache.