Cisco 10005 Instalační příručka stáhnout pdf (Strana 4)

Cisco 10000 Series Router Performance Routing Engine Installation

OL-3971-03

Product Overview

Within the Cisco 10000 series ESR, two PXF network processor ASICs are used, yielding four parallel

processing pipelines, each containing eight processors in a row.

Figure 2 Cisco 10000 Series ESR Forwarding Path Processor Array

In the array of processors in , hardware, microcode, and Cisco IOS software resources provide advanced,

high-touch feature processing on the Cisco 10000 series ESR. The allocation of features to XMCs in the

processor pipeline is flexible and continues to change as new features are added.

The PXF network processor architecture allows all 32 independent processors to work efficiently on

per-packet feature processing, yielding high throughput while still allowing substantial feature

processing.

By centralizing packet processing in the PRE, the Cisco 10000 series ESR architecture frees up space

on line cards, enabling high interface density, yet retaining the compact NEBS transmission equipment

form factor.

Route Processor

The second component of the PRE is the route processor (RP), a high-speed, conventional

microprocessor that has special interfaces to the forwarding path:

• A high-speed direct memory access (DMA) channel that is sends packets back and forth between

the FP and the RP. Packets such as route updates that are not processed by the FP are sent through

this link to the RP. Similarly, the RP sends packets by passing them to the FP for transmission to

line cards.

• The RP also has memory-mapped access to all of the state information used by the eXpress

microcontrollers (XMCs). The RP is responsible for configuring the tables and lists used by the

XMCs.

The RP also includes such standard Cisco IOS facilities as Flash memory, NVRAM for storing

configuration files, and Ethernet connections for network management. This familiar environment makes

possible a simple transition from existing Cisco IOS-based routers to the Cisco 10000 series ESR

platform.

XMC

45275

XMC

PXF network

processor

XMC

Packets

Modified

packets

out

PXF network

processor

1 2 3 4 5 6 7 8 9 ... 45 46

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