Router Installation Guide

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Cisco XR 12410 Router Installation Guide
OL-13832-01
Chapter 1 Cisco XR 12410 Router Overview
Line Card and Route Processor Overview
The PRP-2 performs the following primary functions:
• Executes routing protocol stacks
• Performs all protocol communications with other routers
• Builds and distributes forwarding information to all line cards
• Uploads the operating system software images to all installed line cards
during power-up
• Provides out-of-band system console and auxiliary ports and an Ethernet port
for router configuration and maintenance
• Monitors and manages the power and temperature of system components
such as line cards, power supplies, and fans
The Cisco PRP-2 delivers all these functions with enhanced performance and
capabilities. It also delivers the following feature enhancements (depending on
the software version running):
• Gigabit Ethernet management port
• Hard-drive support (optional part)
• BITS input ports
• 1 GB compact image Flash memory support (optional part)
• Memory scalability up to 4 GB
The PRP-2 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 PRP-2. The MBus connection allows the PRP-2 to download a system
bootstrap image, collect or load diagnostic information, and perform general,
internal system maintenance operations.
The PRP-2 can be designated as either the Designated System Controller (DSC)
or the Secure Domain router (SDR).
The Designated System Controller (DSC) performs the following functions:
• Implements control plane operations for the chassis
• Monitors temperature and voltage
• Monitors line cards
• On boot up, the first card to become active is designated as the DSC.