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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
OL-11497-03
Chapter 1 Product Overview
Route Processors
Route Processors
Each Cisco 12006 and Cisco 12406 router 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.
Route Processor Functions
The RP performs the following are primary functions:
• 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-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 router
The RP will function in any slot in the line card/RP card cage, but slot 5 is the
recommended slot. If the router is equipped with an optional, redundant route
processor, it can be installed in any of the remaining five slots.
The RP communicates with the line cards either through the switch fabric or
through the 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 RP. The MBus connection allows the RP to download a system bootstrap
image, collect or load diagnostic information, and perform general, internal
system maintenance operations.