Asymmetric Digital Subscriber Line (ADSL)

Document ID: 12853

Cisco has announced the end-of-sale for the Cisco 6400 Universal Access Concentrator. For more information, refer to the Cisco 6400 Universal Product Bulletin.

Contents

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Configure
      Network Diagram
      Configurations
Verify
Troubleshoot
NetPro Discussion Forums - Featured Conversations
Related Information

Introduction

This sample configuration enables a PC that connects to a Cisco 675 Asymmetric Digital Subscriber Line (ADSL) router to connect to a Cisco 6400 series Universal Access Concentrator (UAC) with use of RFC 1483 (bridging). The connection is via a Cisco 6100 Advanced Digital Subscriber Line Access Multiplexer (ADSLAM). This configuration allows the route of data to the Internet or other services. The specific equipment that this configuration uses is not necessary. For example, you can replace the Cisco 675 with a Cisco 677 or a Cisco 678.

This sample configuration shows RFC 1483 bridging set up between the Cisco 675 and the Cisco 6400 UAC. A PC that connects at the customer premises obtains an IP address from the Cisco 6400 UAC with use of DHCP. The default gateway is the Bridge-Group Virtual Interface (BVI) on the Cisco 7x00 router. The BVI allows the bridged packets to be routed as necessary. This configuration allows for a cookie cutter rollout. All the boxes have the same configuration, so the cost of rollout and documentation is significantly less.

You can copy and paste to your configurations the code for the Cisco IOS® Software-based Node Route Processor (NRP) and Node Switch Processor (NSP). But the Cisco 675 router uses the Cisco Broadband Operating System (CBOS), and you cannot copy and paste this code. This sample configuration also includes the commands to configure the Cisco 675 router.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The configuration in this document requires these services and software and hardware versions:

• PC or workstation

• Cisco 675 ADSL customer premises equipment (CPE)

• ADSL service from your local telephone company (telco)

• Cisco 6100 ADSLAM with SCM, NI-1, CAP ATU-C

• Cisco 6400 UAC with 1 x NRP and 1 x NSP

• Cisco IOS Software Release 12.0(7)DC for NRP and NSP

• CBOS version 2.3.0.053 for Cisco 675 ADSL Router

• Viewrunner 2.4.1

• System software 2.4.10 for Cisco 6100 ADSLAM

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to Cisco Technical Tips Conventions.

Configure

In this section, you are presented with the information to configure the features described in this document.

Note: To find additional information on the commands used in this document, use the Command Lookup Tool ( registered customers only) .

Network Diagram

This document uses this network setup:

Configurations

Configuration Notes

You must configure a permanent virtual connection (PVC) on the Cisco 6100 ADSLAM that allows the test subscriber to connect. Record the virtual path identifier/virtual channel identifier (VPI/VCI) configuration for use on the Cisco 6400 UAC when you configure the permanent virtual path (PVP) for the NSP and when you terminate the VPI/VCI on the NRP.

This sample configuration shows a virtual path on the NSP. This path allows the Cisco 6400 UAC to pass the cells from the ADSLAM to the terminating NRP, or to another ATM switch.

This document uses these configurations:

• PC Configuration

• Cisco 675 CPE

• Commands to Issue to the Cisco 675

• 6400 NSP

• 6400 NRP

cbos# show run
[[ Spanning Tree = Section Start ]]
MAC Bridge = enabled, rfc1483

cbos# set bridging rfc1483 enabled
You must use "write" then reboot for changes to take effect.

cbos# write
NVRAM written.

cbos# reboot

interface ATM 8/0/1
 no ip address
 no ip directed-broadcast
 no atm ilmi-keepalive
 atm pvp 1 interface ATM 2/0/0 1

ip dhcp excluded-address 172.22.40.1 172.22.40.25
!
!
ip dhcp pool 0
   network 172.22.40.0 255.255.255.0
   default-router 172.22.40.9 
   dns-server <dns server ip address> 
   netbios-name-server <wins server ip address>
!         
!
bridge irb
!
!
interface ATM 0/0/0.200 point-to-point
 no ip directed-broadcast
 pvc 1/35 
  encapsulation aal5snap
!
 bridge-group 1
!
!
interface FastEthernet 0/0/0
 ip address 172.22.32.1 255.255.255.0
 no ip directed-broadcast
!
!
interface BVI 1
 ip address 172.22.40.9 255.255.255.0
 no ip directed-broadcast
!
!
bridge 1 protocol ieee
 bridge 1 route ip

Verify

This section provides information that you can use to confirm your configuration works properly.

Certain show commands are supported by the Output Interpreter Tool ( registered customers only) , which allows you to view an analysis of show command output.

Use these commands on the Cisco 6400 series router:

• show atm vc—Shows whether the correct PVC is established

• show spanning-tree—Shows topology of the bridging structure

Use these commands on the Cisco 675:

• show interface wan0—Shows trained up speed for the DSL link

• show interface wan0-0—Shows RFC 1483 information

Troubleshoot

This section provides information you can use to troubleshoot your configuration.

Note: Before you issue debug commands, refer to Important Information on Debug Commands.

Use this command on the Cisco 6400 series router:

• debug spantree events —Displays bridging topology events

NetPro Discussion Forums - Featured Conversations

Related Information

• Asymmetric Digital Subscriber Line Technology Support
• Product Support Information
• Technical Support & Documentation