Cisco CRS-1 System Description page 21

Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router Overview
Note Performance Route Processor (PRP) cards are also available for the Cisco CRS 8-Slot Line Card Chassis
Enhanced router. Two PRPs perform the same functions as two RPs, but provide enhanced performance for
both route processing and system controller functionality. PRPs are required if you are using Cisco CRS-X.
The RP is a building block of the routing system control plane processing and database solution. The RIB
and FIB databases reside on one or more RP cards. Routing protocols, such as BGP and OSPF, run on the RP
cards and update the route databases. These databases are downloaded to the line cards, and the line card
forwarding engines are programmed appropriately.
Note A chassis may not be populated with a mix of RP and PRP cards. Both route processor cards should be of the
same type (RP or PRP).
Switch Fabric Cards
All switch fabric cards contain switch element chips, and in some cases parallel optical devices, and a service
processor that provides a control plane interface. The hardware control plane interface communicates over
Fast Ethernet links, which provide a channel for fabric configuration and maintenance. Fabric cards can be
hot-swapped at any time, as the fabric has multiple planes and can operate with fewer planes at degraded
performance levels. You can upgrade the CRS routing system switch fabric by bringing down one plane at a
time. During the fabric upgrade, some fabric planes may run in one configuration while others run in a different
configuration.
In addition to configuring the fabric chips, the control plane hardware monitors the fabric for faults. Some
faults require software to isolate failed chips or links. The service processor software monitors link health and
executes isolation actions.
Alphanumeric Displays
Alphanumeric displays on the line card, switch fabric card, and RP card reveal operational states. The display
consists of two lines of four characters each, therefore some messages are wrapped or truncated.
Depending on whether it is the active RP or the standby RP in the system, the alphanumeric display on the
route processor displays either:
ACTV
RP
or
STBY RP
All other nodes display:
IOS- XR
Additionally, the alphanumeric displays reveal the node states listed in
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
Switch Fabric Cards
Table 2: Alphanumeric Displays .
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