Полезная информация

cc/td/doc/product/software/ios120/120newft/120t
hometocprevnextglossaryfeedbacksearchhelp
PDF

Table of Contents

Cisco IOS IEEE 802.1Q Support

Feature Summary

Platforms

Supported MIBs and RFCs

Configuration Tasks

Configuration Examples

Configure AppleTalk over IEEE  802.1Q

Configure IP over IEEE  802.1Q

Configure IPX over IEEE  802.1Q

Command Reference

Cisco IOS IEEE 802.1Q Support

Feature Summary

With the introduction of the Cisco IOS IEEE 802.1Q Support feature, Cisco IOS now supports 802.1Q VLAN encapsulation, in addition to the currently supported ISL and IEEE 802.10 SDE encapsulations. VLANs can now be implemented using 802.1Q encapsulation amoung switches that support this standard. IEEE  802.1Q support is currently available for Fast Ethernet interfaces.

Benefits

VLANs can now implemented with Cisco IOS platforms in environments where the IEEE 802.1Q encapsulation standard is required.

Platforms

This feature is supported on these platforms:

Supported MIBs and RFCs

None.

Configuration Tasks

You can configure routing between any number of VLANs in your network. This section documents the configuration tasks for each protocol supported with IEEE 802.1Q encapsulation. The basic process is the same, regardless of the protocol being routed. It involves

The configuration processes documented in this feature guide include the following:

Configure AppleTalk Routing over IEEE  802.1Q

AppleTalk can be routed over virtual LAN (VLAN) subinterfaces using the IEEE  802.1Q VLAN encapsulation  protocol. AppleTalk Routing provides full-feature Cisco IOS software AppleTalk support on a per-VLAN basis, allowing standard AppleTalk capabilities to be configured on VLANs.

To route AppleTalk over IEEE  802.1Q between VLANs, you need to customize the subinterface to create the environment in which it will be used. Perform these tasks in the order in which they appear:

Enable AppleTalk Routing

To enable AppleTalk routing on IEEE 802.1Q interfaces, use this command in global configuration mode:
Command Purpose

appletalk routing [eigrp router-number]

Enable AppleTalk routing globally.

Define the VLAN Encapsulation Format

To define the VLAN encapsulation format as IEEE 802.1Q, use the following commands in interface configuration mode:
Step Command Purpose

1 . 

interface fastethernet slot/port.subinterface-number

Specify the subinterface the VLAN will use.

2 . 

encapsulation dot1q vlan-identifier

Define the encapsulation format as IEEE  802.1Q (dot1q), and specify the VLAN identifier.

Configure AppleTalk on the Subinterface

After you enable AppleTalk globally and define the encapsulation format, you need to enable it on the subinterface by specifying the cable range and naming the AppleTalk zone for each interface. To enable the AppleTalk protocol on the subinterface, use the following commands in interface configuration mode:
Step Command Purpose

1 . 

appletalk cable-range cable-range [network.node]

Assign the AppleTalk cable range and zone for the subinterface.

2 . 

appletalk zone zone-name

Assign the AppleTalk zone for the subinterface.

Configure IP Routing over IEEE 802.1Q

IP routing over IEEE 802.1Q extends IP routing capabilities to include support for routing IP frame types in VLAN configurations using the IEEE 802.1Q encapsulation.

To route IP over IEEE 802.1Q between VLANs, you need to customize the subinterface to create the environment in which it will be used. Perform these tasks in the order in which they appear:

Enable IP Routing

IP routing is automatically enabled in the Cisco IOS software for routers. To reenable IP routing if it has been disabled, use the following command in global configuration mode:  
Command Purpose

ip routing

Enable IP routing on the router.

Once you have IP routing enabled on the router, you can customize the characteristics to suit your environment. If necessary, refer to the IP configuration chapters in the Network Protocols Configuration Guide, Part 1 for guidelines on configuring IP.

Define the VLAN Encapsulation Format

To define the encapsulation format as IEEE  802.1Q, use the following commands in interface configuration  mode:
Step Command Purpose

1 . 

interface fastethernet slot/port.subinterface-number

Specify the subinterface on which IEEE  802.1Q will be used.

2 . 

encapsulation dot1q vlanid

Define the encapsulation format as IEEE  802.1Q (dot1q), and specify the VLAN identifier

Assign IP Address to Network Interface

An interface can have one primary IP address. To assign a primary IP address and a network mask to a network interface, use the following command in interface configuration mode:
Command Purpose

ip address ip-address mask

Set a primary IP address for an interface.

A mask identifies the bits that denote the network number in an IP address. When you use the mask to subnet a network, the mask is then referred to as a subnet mask.

Configure IPX Routing over IEEE  802.1Q

IPX Routing over IEEE  802.1Q VLANs extends Novell NetWare routing capabilities to include support for routing Novell Ethernet_802.3 encapsulation frame types in VLAN configurations. Users with Novell NetWare environments can configure Novell Ethernet_802.3 encapsulation frames to be routed using IEEE  802.1Q encapsulation across VLAN boundaries.

To configure Cisco IOS software on a router with connected VLANs to exchange IPX Novell Ethernet_802.3 encapsulated frames, perform these tasks in the order in which they are appear:

Enable NetWare Routing

To enable IPX routing on IEEE  802.1Q interfaces, use the following command in global configuration mode:
Command Purpose

ipx routing [node]

Enable IPX routing globally.

Define the VLAN Encapsulation Format

To define the encapsulation format as IEEE  802.1Q, use the following commands in interface configuration  mode:
Step Command Purpose

1 . 

interface fastethernet slot/port.subinterface-number

Specify the subinterface on which IEEE  802.1Q will be used.

2 . 

encapsulation dot1q vlan-identifier

Define the encapsulation format as IEEE  802.1Q and specify the VLAN identifier.

Configure NetWare on the Subinterface

After you enable NetWare globally and define the VLAN encapsulation format, you may need to enable the subinterface by specifying the NetWare network number. Use this command in interface configuration mode:
Command Purpose

ipx network network

Specify the IPX network number.

Configuration Examples

This section provides configuration examples for each of the protocols described in this feature guide. It includes these examples:

Configure AppleTalk over IEEE  802.1Q

This configuration example shows AppleTalk being routed on VLAN 100.

!
appletalk routing
!
interface fastethernet 4/1.100
    encapsulation dot1q 100
    appletalk cable-range 100-100 100.1
    appletalk zone eng
!

Configure IP over IEEE  802.1Q

This configuration example shows IP being routed on VLAN 101.

!
ip routing
!
interface fastethernet 4/1.101
    encapsulation dot1q 101
    ip addr 10.0.0.11 255.0.0.0
!

Configure IPX over IEEE  802.1Q

This configuration example shows IPX being routed on VLAN 102.

!
ipx routing
!
interface fastethernet 4/1.102
    encapsulation dot1q 102
    ipx network 100
!

Command Reference

This section documents new or modified commands. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command references.

encapsulation dot1q

Use the encapsulation dot1q subinterface command to enable IEEE  802.1Q encapsulation of traffic on a specified subinterface in virtual LANs. IEEE  802.1Q is a standard protocol for interconnecting multiple switches and routers, and for defining VLAN topologies.

encapsulation dot1q vlan-id

Syntax Description

vlan-id

Virtual LAN identifier. The allowed range is 1 to 1000

Default

Disabled

Command Mode

Subinterface configuration

Usage Guidelines

This command first appeared in Cisco IOS Release 12.0(1)T.

IEEE  802.1Q encapsulation is configurable on Fast Ethernet interfaces.

Example

The following example encapsulates VLAN traffic using the IEEE  802.1Q protocol for VLAN 100:

interface fastethernet 4/1.100
    encapsulation dot1q 100

Related Commands

encapsulation isl
encapsulation sde


hometocprevnextglossaryfeedbacksearchhelp
Copyright 1989-1998 © Cisco Systems Inc.