Cisco Systems 12006 series, 12406 series manual Sdram

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Chapter 1 Product Overview

Route Processors

SDRAM

SDRAM stores routing tables, protocols, and network accounting applications, and runs the Cisco IOS software. The default PRP configuration includes 512 MB of error checking and correction (ECC) SDRAM. DIMM upgrades of 512 MB and 1 GB are available. You cannot mix memory sizes. If two DIMMS are installed, they must be the same memory size.

Caution Cisco Systems strongly recommends that you use only Cisco-approved memory. To prevent memory problems, SDRAM DIMMs must be +3.3 VDC, PC133-compliant devices. Do not attempt to install other devices in the DIMM sockets.

SRAM

SRAM provides 2 MB of parity-protected, secondary CPU cache memory. It acts as a staging area for routing table updates and for information sent to and received from line cards. SRAM is not user configurable and cannot be upgraded in the field.

NVRAM

NVRAM provides 2 MB of memory for system configuration files, software configuration register settings, and environmental monitoring logs. This information is backed up with built-in lithium batteries that retain the contents for a minimum of 5 years. NVRAM is not user configurable and cannot be upgraded in the field.

Flash Memory

Flash memory allows you to remotely load and store multiple Cisco IOS software and microcode images. You can download a new image over the network or from a local server and then add the new image to Flash memory or replace the existing files. You then can boot the routers either manually or automatically from any of the stored images.

Flash memory also functions as a TFTP server to allow other servers to boot remotely from stored images or to copy them into their own Flash memory. The onboard Flash memory (called bootflash) contains the Cisco IOS boot image, and

 

 

Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide

 

 

 

 

 

 

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Contents Introduction Product OverviewProduct Description Cisco 12006 and Cisco 12406 router Front View Product Overview Product Description Product Overview Product Description Cisco 12006 and Cisco 12406 router Rear View RP and Line Card Slots Physical and Functional DescriptionChassis Chassis Backplane Switch Fabric Card SlotsAlarm Card Slots Cooling PowerSwitch Fabric Card Types Multigigabit Crossbar Switch FabricNonredundant and Redundant System Configurations Switch Fabric Redundancy Switch Fabric Switching Capacity and Router TypeDevice Discovery Maintenance BusPower-Up/Down Control Code Download DiagnosticsEnvironmental Monitoring and Alarms Route Processor Functions Route ProcessorsGigabit Route Processor Route Processor TypesProduct Overview Route Processors GRP Layout Type Size Quantity Description Location GRP Memory ComponentsSram System Status LEDs Reset AUX Coll RX Link MIIGRP Alphanumeric LED Displays Partial Faceplate Soft Reset SwitchAsynchronous Serial Ports Pcmcia SlotsEthernet Port Performance Route Processor Front View Performance Route ProcessorProduct Overview Route Processors PRP Horizontal Orientation Sdram PRP Memory ComponentsSdram Flash Disk Size Product Number Soft Reset Switch Ethernet Ports Flash Disk SlotsLine Cards 10 Sample Line Cards Alarm Alarm CardsAlarm Card Status Alarm Output FunctionClock and Scheduler Card and Switch Fabric Card Status Alarm Relay Contact Connector Power SubsystemsPower Source Monitoring AC PDU AC Power Subsystem12 AC Power Distribution Unit 13 AC-Input Power Supply AC-Input Power SupplyProduct Overview Power Subsystems LED Label Function State Description DC Power Subsystem14 DC Power Distribution Unit DC-Input Power Entry Module Power a16 DC-Input Power Entry Module LED Label Color Function Blower Module Power DistributionTop view 18 Air Filter Locations Air FiltersCable-Management System 19 Chassis Cable-Management System Field-Replaceable Units Technical Specifications
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