Drp Card - Cisco CRS-1 System Description

DRP Card

Cisco CRS routing system that functions as a complete router, running its own routing protocols and forwarding
IP packets between its interfaces.
Note
Currently, the Cisco CRS 8-slot Line Card Chassis Enhanced router can function as a single logical router
only.
See Limitations and Restrictions
The following sections describe the DRP card and the DRP PLIM. Throughout these sections, unless otherwise
noted, DRP refers to both the DRP and its associated PLIM.
DRP Card
The DRP card (CRS-DRP) is an optional component that enhances Cisco CRS 8-slot Line Card Chassis
Enhanced router routing capabilities by serving as an additional route processor in the system. The DRP can
be installed in any MSC (line card) slot in the line card chassis. The corresponding DRP PLIM is installed in
the corresponding PLIM slot. The cards are connected to each other through the chassis midplane.
The main components of the DRP are:
• Two symmetric processors (SMP0 and SMP1)—Perform route processing tasks. The SMPs are independent
• The SMPs are not connected to each other internally, but they can communicate with each other through
• Two CPUCTRL ASICs—Provide an interface between the SMPs and the switch fabric ASICs. Each
• Several switch fabric ASICs—Provide the interface to and from the switch fabric:
The IngressQ ASIC has a memory buffer for storing packets. This buffer storage provides input rate-shaping
queues for shaping switch-bound traffic. Input rate shaping is used to provide bandwidth and QoS guarantees
for physical and logical port traffic and to smooth traffic bursts into the switch fabric.
•
• Several interfaces—Provide communications paths among the components on the DRP.
• Additional components—Include power and clocking components, voltage and temperature sensors, and
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
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of each other and operate simultaneously. You can assign routing processes, which normally run on the
RP, to run on the DRP instead.
the routing system switch fabric or Ethernet control plane. Service processor module—Communicates
with the RP (which is the system controller), controls DRP processes, and monitors voltages and
temperatures on the DRP and DRP PLIM.
ASIC has a set of eight ingress and egress queues for buffering data.
• Two FabricQ ASICs—Receive cells from the switch fabric, reorder the cells and reassemble them
into packets, and queue the packets for transmission to the CPUCTRL ASICs. The FabricQ ASICs
are part of the Rx path on the DRP. Each FabricQ ASIC is connected to a different CPUCTRL
ASIC.
• IngressQ ASIC—Receives data packets from the SMP, segments the packets into cells, and distributes
the cells to the switch fabric. The ASIC is part of the Tx path on the DRP. The module has
connections to both SMPs, but only one SMP controls the IngressQ ASIC at any time. By default,
SMP0 controls the ASIC at startup.
• Two Qlink modules—Provide the interface to the switch fabric. The modules convert data between
the format used by the FabricQ and IngressQ ASICs and the format used by the switch fabric. Each
Qlink module provides an interface to four planes of the switch fabric.
an identification EEPROM that stores initial configuration and hardware information.
for information about the limitations of the DRP that apply to this release.
Route Processor