Routing And Switch Fabric Components - Cisco CRS-1 System Description

Routing and Switch Fabric Components

Routing and Switch Fabric Components
The Cisco CRS 8-slot Line Card Chassis Enhanced router contains:
• As many as eight MSC, FP, and LSP cards (all types are also called line cards), and eight PLIMs. The
Note For a complete list of line cards, route processors, SPAs and SIPs, and interface modules supported in the
Cisco CRS 8-slot line card chassis, go to the Cisco Carrier Routing System Data Sheets at:
http://www.cisco.com/en/US/products/ps5763/products_data_sheets_list.html
• A chassis midplane that connects line cards to their associated PLIMs. The midplane design allows a
• One or two route processor cards (RPs). The RPs provide the intelligence of the system by functioning
The RP also monitors system alarms and controls the system fans. LEDs on the front panel indicate active
alarm conditions.
A Performance Route Processor (PRP) is 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.
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).
• Upper and lower fan trays. The fans pull cool air through the chassis.
• Four half-height switch fabric cards. These cards provide the three-stage Benes switch fabric for the
The switch fabric receives user data from one line card and PLIM pair and performs the switching necessary
to route the data to the appropriate egress line card and PLIM pair. The switch fabric is divided into eight
planes that are used to evenly distribute the traffic across the switch fabric. Each switch fabric card implements
two planes of the switch fabric.
• A power system that provides redundant power to the chassis. The modular configuration power solution
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router System Description
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line card and PLIM are an associated pair of cards that mate through the chassis midplane. The line card
provides the forwarding engine for Layer 3 routing of user data, and the PLIM provides the physical
interface and connectors for the user data. The line card can be associated with several different PLIMs,
which provide different interface speeds and technologies.
line card to be removed from the chassis without having to disconnect the cables that are attached to the
associated PLIM. The midplane distributes power, connects the line card to the switch fabric cards, and
provides control plane interconnections. The midplane is not field replaceable by the customer.
as the Cisco CRS 8-slot Line Card Chassis Enhanced router system controller and providing route
processing. Only one RP is required for system operation. For redundant operation, you can order a
second RP as an option (CRS-8-RP/R). When two RPs are used, only one RP is active at a time. The
second RP acts as a "standby" RP, serving as a backup if the active RP fails.
routing system. The switch fabric performs the cross-connect function of the routing system, connecting
every line card (and its associated PLIM) with every other line card (and its associated PLIM) in the
system.
contains two power shelves with either up to four DC power modules (PMs) or up to three AC PMs per
power shelf.
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Enhanced Router Overview