Cisco Systems Cisco 12008 manual shows the front panel view of the PRP

Overview of the Cisco 12008

Figure 1-11 shows the front panel view of the PRP.

Figure 1-11 Performance Route Processor (Front Panel View, Horizontal Orientation Shown)

ETH 0

EJECT	SLOT
	-1
	-0
	SLOT

PRIMARY

	ETH 1
	RX
EN	TX
LINK	PRIMARY

AUX CONSOLE

	RX
EN	TX
LINK

RESET

PERFORMANCE ROUTE PROCESSOR 1 (PRP-1)

75041

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.

Product Overview 1-35