Chapter 1 Cisco XR 12406 Router Overview
Physical and Functional Description
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.
The Secure Domain Router (SDR) controls domain security features independent of any other SDRs on the network.
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