Product Overview 1-35
Overview of the Cisco 12008
Figure1-11 shows the front panel view of the PRP.
Figure1-11 Performance Route Processor (Front Panel View, Horizontal
Orientation Shown)
The PRP is available as Product Number PRP-1=, which includes one PRP with 512 MB
of synchronous dynamic random-access memory (SDRAM) and one 64-MB advanced
technology attachment (ATA) Flash disk.
The primary functions of the PRP 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 two IEEE 802.3, 10/100-megabits-per-second (Mbps) Ethernet ports for
Telnet functionality
•Running routing protocols
•Building and distributing routing tables to line cards
•Providing general system maintenance functions
•Communicating with line cards either through the switch fabric or through the
maintenance bus (MBus)
The MBus connection allows the PRP to download a system bootstrap image, collect or
load diagnostic information, and perform general, internal system maintenance
operations. The switch fabric connection is the main data path for routing table
distribution as well as for packets that are sent between line cards and the PRP.
The PRP contains the following components:
•Motorola PowerPC 7450 central processing unit (CPU). The CPU runs at an external
bus clock speed of 133 MHz and an internal clock speed of 667 MHz.
EJECT
RX
TX
PRIMARY
SLOT-1
SLOT-0
LINK
EN
RX
TX
ETH 1ETH 0 AUX
CONSOLE
PERFORMANCE ROUTE PROCESSOR 1 (PRP-1)
LINK
PRIMARY
EN
RESET
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