Cisco Systems 7500 Series manual OL-5008-03 B0

Chapter 1 Cisco 7500 Series Product Overview

Route Switch Processor Overview

The RSP4/4+ contains the following components:

•IDT R5000 Reduced Instruction Set Computing (RISC) processor, used for the CPU. The CPU runs at an external bus clock speed of 100 MHz and an internal clock speed of 200 MHz.

•Up to 256 megabytes (MB) of parity-protected, dynamic random-access memory (DRAM) on two dual in-line memory modules (DIMMs); 32 MB of DRAM is the default shipping configuration.

•2 MB of parity-protected, static random-access memory (SRAM) for packet buffering, and 512 KB of SRAM for secondary CPU cache memory functions. (SRAM is not user- configurable.)

•Most of the additional memory components used by the system, including onboard Flash memory and up to two PC Cards. (A bank of hardware [MAC-layer] addresses for the interface port is contained in an NVRAM device on the router backplane.)

•Air-temperature sensors for environmental monitoring. (All of the logic for the environmental monitoring functions is contained on the router interface card.)

In addition to running the system software from DRAM, the RSP4/4+ contains and executes the following management functions that control the system:

•Sending and receiving routing protocol updates.

•Managing tables and caches.

•Monitoring interface and environmental status.

•Providing Simple Network Management Protocol (SNMP) management and the interface between the console and Telnet.

•Combining all of the switched routing and high-speed switching functions that communicate with and control the interface processors on the dual CyBus. This switching section decides the destination of a packet and switches it accordingly.

The RSP4/4+ supports high system availability (HSA), which is a feature in Cisco IOS Release 11.1(4) or later, allowing two RSPs to be used in a Cisco 7507, Cisco 7507-MX, Cisco 7513, or Cisco 7513-MX router. By default, the system master is the RSP that occupies the first RSP slot in the router: slot 2 in the Cisco 7507, and slot 6 in the Cisco 7513.

Note The Cisco 7576 uses only one RSP slot per router, designated router A and router B; therefore, it does not support HSA. The Cisco 7505 has only one RSP slot; therefore, it also does not support the HSA feature. The RSPs in these models are automatically the system master for their respective routers.

The RSP4/4+ ships as the following product numbers:

•As a spare part, as Product Number RSP4=

•Bundled with and installed in Cisco 7500 series routers, as the following product numbers:

–Product Number CISCO7505/4(=), a Cisco 7505 with one installed RSP4.

–Product Number CISCO7507/4(=), a Cisco 7507 with one installed RSP4.

–Product Number CISCO7513/4(=), a Cisco 7513 with one installed RSP4.

–Product Number CISCO7507/4x2(=), a Cisco 7507 with two installed RSP4s.

–Product Number CISCO7513/4x2(=), a Cisco 7513 with two installed RSP4s.

–Product Number CISCO7576(=), a Cisco 7576 with two installed RSP4s. (This is the default configuration when the Cisco 7576 is purchased new and not upgraded from a Cisco 7513.)

The RSP4/4+ contains most of the memory components used by the system. Table 1-8lists the functions of each type of memory on the RSP4/4+.

	Cisco 7500 Series Installation and Configuration Guide
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