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Cisco 12404 Internet Router Installation and Configuration Guide
OL-11636-01
AppendixA Technical Specifications
Product Architecture
•Asynchronous serial ports
Figure A-3 Performance Route Processor
The following are primary functions of the PRP.
•Loading the Cisco IOS software to all of the installed line cards at power on
•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-megabit-per-second (Mbps) Ethernet port
for Telnet functionality
•Running routing protocols
•Building and distributing routing tables to the line cards
•Providing general system maintenance functions for the Cisco 12404 router.
The PRP communicates with the line cards either through the CSF or through the
maintenance bus (MBus). The CSF connection is the main data path for routing
table distribution as well as for packets that are sent between the line cards and
the PRP.
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 PRP plugs into any slot in the card cage in the
Cisco 12404 router. The router is shipped with 20MB of Flash memory as the
default configuration.
PRP Memory
Memory components of the PRP are listed in Tabl e A-7.
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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