Cisco XR 12816 Manuale di installazione - Pagina 16

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Switch Fabric Overview

Note

Switch Fabric Card Functionality

Cisco XR 12416 and Cisco XR 12816 Router Chassis Installation Guide

1-16

The switch fabric provides synchronized gigabit-speed connections between line

cards and the RP. The switch fabric card cage is located behind the air filter door

and consists of 2 clock and scheduler cards (CSCs) and 3 switch fabric cards

(SFCs). One CSC and the 3 SFCs are the active switch fabric; the second CSC

provides redundancy for the other 4 cards.

10-Gbps switch fabrics do not operate in 1/4-bandwidth mode as they did in some

earlier models of the Cisco 12000 series routers. You must have at least one CSC

and three SFCs for the system to function. You can add an additional CSC for

redundancy.

Each SFC or CSC provides 10-Gbps full-duplex connection to each line card in

the system. For example, in a Cisco XR 12416 and Cisco XR 12816 Router with

16 line cards, each with 2 x 10 Gbps capacity (full duplex), the system switching

bandwidth is 16x 20 Gbps = 320 Gbps.

The Cisco XR 12416 and Cisco XR 12816 Routers support online insertion and

removal (OIR), which allows you to remove and replace a card while the router

remains powered on.

The core of the router is a crossbar switch fabric that provides synchronized

connections between the line cards and the RP. The switch fabric consists of 2

clock scheduler cards (CSCs) and 3 switch fabric cards (SFCs) installed in the

switch fabric card cage. One CSC and the three SFCs are the active switch fabric;

the second CSC provides redundancy for the other 4 cards.

The router also ships with a blank switch fabric card installed in the far left

(non-working) slot of the switch fabric card cage. The blank filler panel balances

the air flow through the switch fabric card cage which helps maintain proper air

flow through the chassis.

Chapter 1

Product Overview

OL-17440-01