USED REMOVED FROM CISCO 12000 SERIES ROUTER
30 DAYS WARRANTY
Gigabit Route Processor
Each Cisco 12012 GSR has one main system (or route) processor. The route processor (RP) processes the network routing protocols and distributes updates to the Cisco Express Forwarding (CEF) tables on the line cards. The RP also performs general maintenance functions, such as diagnostics, console support, and line card monitoring.
Two types of RPs are available for the Cisco 12012 GSR:
•
Gigabit Route Processor (GRP)
•Performance Route Processor (PRP)
When not explicitly specified, this document uses the term route processor (RP) to indicate either the GRP or the PRP.
Note If you install a second, redundant RP, it must be of the same type as the primary RP.
This section provides information about the Gigabit Route Processor (GRP) (see ) and its use as the main system processor for the Cisco 12012.
This section provides information on the following GRP functionality:
•Memory components
•System status LEDs
•Soft reset switch
•PCMCIA slots
•Asynchronous serial ports
•Ethernet port
Figure 1-2 Gigabit Route Processor (Front Panel View, Horizontal Orientation Shown)
The primary functions of the GRP are as follows:
•Downloading the Cisco IOS software to all of the installed line cards at power up
•Providing a console (terminal) port for router configuration
•Providing an auxiliary port for other external equipment (such as modems)
•Providing an IEEE 802.3, 10/100-megabits-per-second (Mbps) Ethernet port for Telnet functionality
•Running routing protocols
•Building and distributing routing tables to line cards
•Providing general system maintenance functions
The GRP communicates with the line cards either through the switch fabric or through a maintenance bus (MBus). The switch fabric connection is the main data path for routing table distribution as well as for packets that are sent between the line cards and the GRP. The MBus connection allows the GRP to download a system bootstrap image, collect or load diagnostic information, and perform general, internal system maintenance operations. The GRP plugs into any slot in the upper card cage in the Cisco 12012 except the rightmost slot, which is reserved for the alarm card.
The GRP 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, extended data output (EDO) dynamic random-access memory (DRAM) on two, 60-nanosecond (ns), dual in-line memory modules (DIMMs); 64 MB of DRAM is the minimum shipping configuration.
•512 kilobytes (KB) of static random-access memory (SRAM) for secondary CPU cache memory functions (SRAM is not user configurable or field upgradeable).
•512 KB of NVRAM (NVRAM is not user configurable or field upgradeable).
•Most of the additional memory components used by the system, including onboard Flash memory (8-MB) and up to two PCMCIA-based Flash memory cards. The default GRP PCMCIA Flash memory is 20 megabytes (MB).
•Air-temperature sensors for environmental monitoring.
The Cisco IOS software images that run the Cisco 12012 reside in Flash memory, which is located on the GRP in the form of a single in-line memory module (SIMM), and on up to two Personal Computer Memory Card International Association (PCMCIA) cards (called Flash memory cards) that insert in the two PCMCIA slots (slot 0 and slot 1) on the front of the GRP. (See .) Storing the Cisco IOS images in Flash memory enables you to download and boot from upgraded Cisco IOS images remotely or from software images resident in GRP Flash memory.
The Cisco 12012 supports downloadable system software for most Cisco IOS software upgrades, which enables you to remotely download, store, and boot from a new Cisco IOS image.
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