Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual de usuario descargar pdf (Pagina 18)

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Figure 7 illustrates the different Cisco IOS Software interface types and the commands to use the

Layer 2 or Layer 3 functionality.

Figure 7. Port Concepts in the Cisco IOS Software Model

Cisco IOS Software numbers for interfaces start from 1, not 0, for a module; that is, the first

interface on the line card in slot 2 is 2/1. This is the same port numbering convention that is used

with the Cisco Catalyst OS.

More detailed descriptions of the three primary port types found in Cisco IOS Software are

included below.

Routed Interfaces

Cisco IOS Software provides two means for creating Layer 3 interfaces: either at the physical port

level (routed interfaces, described here) or at the virtual port level (SVIs, described in the following

section). With Cisco IOS Software, each physical port is a routed interface (just like any Cisco

router) by default. Every Ethernet port on the switch (Fast Ethernet, Gigabit Ethernet, or 10 Gigabit

Ethernet) is shown as interface <interfacetype> <slot/port> and is shutdown by default. This

operation differs from the Cisco Catalyst OS, which has all ports enabled, Layer 2 aware, and in

VLAN 1 by default and does not support routed interfaces. The routed interface in Cisco IOS

Software must be configured on a unique IP subnet or IPX network. No Layer 2 protocols such as

Spanning Tree Protocol and DTP are enabled on these interfaces.

For traditional LAN-based Ethernet ports, the routed interface does not support subinterface

creation for separating dot1q encapsulations. Functionality to that of IEEE 802.1q subinterfaces is

provided with trunk ports, described in the following sections.

Layer 2 VLAN

To place several interfaces in the same IP or IPX subnet, the port needs to be converted from a

routed interface to a Layer 2 port so that the port can be part of the Layer 2 domain or VLAN. The

first step in this conversion of the routed interface is to create the Layer 2 VLAN entity.

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Cisco WS-X6416-GE-MT - Interface Module - Expansion Manual de usuario Pagina 18