Network Processing Engine and Network Services Engine Installation and Configuration
NSE-1 Overview
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NSE-1 Overview

Table Of Contents

NSE-1 Overview

Supported Platforms

Software Requirements

NSE-1 Description and Overview


System Management Functions

Terms and Acronyms

NSE-1 Memory Information

NSE-1 Overview

This chapter describes the network services engine (NSE-1) and contains the following sections:

Supported Platforms

Software Requirements

NSE-1 Description and Overview

NSE-1 Memory Information

For NSE-1 configuration and PXF troubleshooting information including NSE-1-specific show and debug commands, see Chapter 10, "Configuration Tasks and Troubleshooting Information."

Supported Platforms

The NSE-1 is supported only in the Cisco 7200 VXR routers. The NSE-1 is not supported in the Cisco uBR7200 VXR series routers.

Software Requirements

For minimum software release information, see the "Software Requirements" section on page 8-4.

NSE-1 Description and Overview

This section contains information about the network services engine components and the system management functions. The network services engine maintains and executes the system management functions for the Cisco 7200 VXR routers. The NSE-1 also shares the system memory and environmental monitoring functions with the I/O controller. Its performance is greater than that of the network processing engines because of the Parallel eXpress Forwarding (PXF) processor. The PXF processor works with the routing processor to provide accelerated packet switching, as well as accelerated IP Layer 3 feature processing.

The NSE-1 consists of two modular boards: the processor engine board and the network controller board. It is keyed so that it can be used only in the Cisco 7200 VXR routers.

Note The NSE-1 is not supported in the Cisco uBR7200 VXR series routers, even though it is physically capable of being inserted into the routers.


Figure 4-1 NSE-1


Network controller board


Midplane connectors


Keying post


Boot ROM (U1)


System controller


Temperature sensor


Processor engine board




Captive installation screw


Parallel eXpress Forwarding (PXF) processor


RM7000 microprocessor


Temperature sensor




The NSE-1 consists of the following components:

Reduced instruction set computing (RISC) microprocessor

The NSE-1 uses an RM7000 microprocessor that operates at an internal clock speed of 262 MHz.

Parallel eXpress Forwarding processor

The Parallel eXpress Forwarding (PXF) processor enables parallel IP multipacket processing functions, working with the routing processor to provide accelerated packet switching, as well as accelerated IP Layer 3 feature processing.

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

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

SRAM—static random-access memory

Unified cache—Instruction cache and data cache are combined. For example, a processor may have primary cache with separate instruction and data cache memory, but unified secondary cache.

NSE-1 Memory Information

To determine the memory configuration of your NSE-1, use the show version command.

The following example shows an NSE-1 installed in a Cisco 7206VXR router:

Router# show version
Cisco Internetwork Operating System Software
IOS (tm) 7200 Software (C7200-P-M), Released Version 12.0 
Copyright (c) 1986-1999 by cisco Systems, Inc.
Compiled Wed 22-Dec-99 08:37 by
Image text-base:0x60008900, data-base:0x60B58000

  (display text omitted)

cisco 7206VXR NSE-1 processor with 57344K/8192K bytes of memory.
R7000 CPU at 262Mhz, Implementation 39, Rev 1.0, 256KB L2 Cache 
6 slot VXR midplane, Version 2.0

  (display text omitted)

Table 4-1 provides memory specifications and Table 4-2 provides user replaceable memory configuration information for the NSE-1.

Table 4-1 NSE-1 Memory Specifications  

Memory Type
Component Location on the NSE-1 Board


128 MB or 256 MB


128-MB or 256-MB DIMMs


Boot ROM

512 KB


OTP1 ROM for the ROM monitor program


Primary cache

16 KB (instruction), 16 KB (data)

RM7000 processor, internal cache


Secondary cache

256 KB

RM7000 processor, internal, unified cache


Tertiary cache

2 MB (fixed)

RM7000 processor, external cache2

U7, U9, U12, U14, U17

1 OTP = one time programmable

2 Located on the processor engine board.

Table 4-2 NSE-1 SDRAM DIMM Configurations—Configurable Memory Only

Product Number

128 MB


1 128-MB DIMM


256 MB


1 256-MB DIMM