Cisco Router XR 12416 Installation Manual page 21

Chapter 1 Product Overview
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The Cisco PRP-2 and PRP-3 delivers all these functions with enhanced
performance and capabilities. It also delivers the following feature enhancements
(depending on the software version running):
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The PRP-2 and PRP-3 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. The MBus connection allows the PRP-2 and PRP-3 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:
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The Secure Domain Router (SDR) controls domain security features independent
of any other SDRs on the network.
In addition to the functionality listed for the PRP-2, PRP-3 provides the following
specific functions:
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OL-17440-01
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
2 Ethernet management ports
Hard-drive support (optional part)
BITS input ports
1 GB compact image Flash memory support (optional part)
Memory scalability up to 4 GB with PRP-2 and up to 8 GB with PRP-3.
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.
Reduced boot time.
Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide
Route Processor
1-21