Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual de usuario descargar pdf (Pagina 4)

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Cisco Catalyst OS with optional Cisco IOS Software on the MSFC provides Layer 2/3/4

functionality for the Cisco Catalyst 6500 by integrating two operating systems. A switch

running the Cisco Catalyst OS only on the supervisor engine is a Layer 2 forwarding device

with Layer 2/3/4 functionality for quality of service (QoS), security, multicast, and network

management, but does not have any routing capabilities. Layer 3 routing functionality is

provided by a Cisco IOS Software image on the MSFC routing engine (optional in the Cisco

Catalyst 6500 Series Supervisor Engine 1A and Cisco Catalyst 6500 Series Supervisor

Engine 2 and integrated within Cisco Catalyst 6500 Supervisor Engine 32 and Cisco

Catalyst 6500 Series Supervisor Engine 720 models). The two operating systems work

together to provide complete Layer 2/3/4 system functionality.

The hybrid model operates based on two operating images, two configurations, and two

command lines; one each for Cisco Catalyst OS and Cisco IOS Software. The default

operation of Cisco Catalyst OS is as a switch (all ports bridging in VLAN1). Additionally, the

switch-running hybrid can be configured to operate as a router.

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Cisco IOS Software for the supervisor engine on the Cisco Catalyst 6500 Series

provides a single Cisco IOS Software image, configuration, and command line to support all

Layer 2, 3, and 4 functionality on the switch. Cisco IOS Software has historically been a

Layer 3 operating system on routing platforms, and when installed on the supervisor engine

of a Cisco Catalyst 6500 has expanded these capabilities to include true Layer 2

functionality as well. Cisco IOS Software requires an MSFC daughter card be present on

the supervisor engine (default on the Cisco Catalyst 6500 Supervisor Engine 32 and Cisco

Catalyst 6500 Series Supervisor Engine 720).

The default operation of Cisco IOS Software is as a router (all ports are Layer 3 and in the

shutdown state), but the interfaces can also be configured to operate as a switch.

The native Cisco IOS Software operating model was originally developed to target service

provider and enterprise data center backbones and distribution layer services. However,

with the SXF and SXH Cisco IOS Software trains, many wiring closet features have been

added. Cisco IOS Software combines the switching features of the Cisco Catalyst 6500

Series with routing features of Cisco IOS Software to create a single, integrated operating

system that performs all switching and routing functionality, providing operational ease of

use. A Cisco IOS Software system has the capability to scale the throughput and bandwidth

of a Cisco Catalyst 6500 Series to 400+ Mpps and 720 Gbps, respectively.

Switch Processor Functions

The switch processor controls all chassis-related operations such as the detection of online

insertion and removal (OIR) events, power management, environmental management, and

redundancy management. The switch processor also handles the download of the appropriate line

card firmware to each line card, basic port management (setting of port configuration, detection of

link state, and so on), and other Layer 2 functionality such as Spanning Tree Protocol, VLAN

Trunking Protocol (VTP), Internet Group Management Protocol (IGMP) snooping, and Dynamic

Trunking Protocol (DTP). Finally, the switch processor provides console connection for the Cisco

Catalyst OS or Cisco IOS Software during initial system boot.

Route Processor Functions

The route processor provides Layer 3 functionality such as routing and Cisco Express Forwarding

table creation. Cisco Express Forwarding is the default Layer 3 forwarding mechanism. The route

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