Cisco 600 Series DSL Customer Premises Equipment Routers

Document ID: 12898

Contents

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Configure
      Network Diagram
      Configurations
Verify
Troubleshoot
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Related Information

Introduction

This sample configuration shows a Cisco 67x Digital Subscriber Line (DSL) Router connected to a Cisco 6130 Digital Subscriber Line Access Multiplexer (DSLAM), that terminates on a Cisco 6400 Universal Access Concentrator (UAC).

The Cisco 67x router is configured with RFC1483 Bridging and the Cisco 6400 is configured with routed bridge encapsulation (RBE).

The ATM RBE feature in the Cisco 6400 node route processor (NRP) routes IP over bridged RFC1483 Ethernet traffic from a stub-bridged LAN.

Bridged IP packets received on an ATM interface configured in route-bridge mode are routed via an IP header. The interface takes advantage of the characteristics of a stub LAN topology commonly used for DSL access and offers increased performance and flexibility over integrated routing and bridging (IRB).

Route-bridged encapsulation alleviates the security, scalability, and performance problem inherit with bridge-group commands and IRB that pertain to MAC layer broadcasting.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on these software and hardware versions:

• PC Workstation

• Cisco 67x asymmetric digital subscriber line (ADSL) Customer Premises Equipment (CPE)

• Cisco 6400 UAC-NRP IOS® Software Release 12.0(7)DC

• Cisco 6400 UAC-NSP IOS Software Release 12.0(4)DB

• Cisco 6130 DSLAM-NI2 IOS Software Release 12.1(1)DA

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 the 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

This document uses these configurations:

• PC

• Cisco 675 CPE

• Commands to Issue to the Cisco 675

• Cisco 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

Current configuration:
! 
version 12.0 
no service pad 
service timestamps debug datetime msec
service timestamps log datetime msec 
! 
hostname NRP
! 
redundancy 
 main-cpu 
  no auto-sync standard 
 no secondary console enable 
ip subnet-zero 
! 
interface Loopback1 
 ip address 10.0.0.2 255.0.0.0  
 no ip directed-broadcast 
! 
interface ATM0/0/0 
 no ip address 
 no ip directed-broadcast 
 no ip mroute-cache 
 no atm ilmi-keepalive
! 
interface ATM0/0/0.4 point-to-point 
 ip unnumbered Loopback1
 no ip directed-broadcast
 atm route-bridged ip 
 pvc 4/100
  encapsulation aal5snap 
! 
! 
interface Ethernet0/0/1 
 no ip address 
 no ip directed-broadcast 
! 
interface Ethernet0/0/0
 no ip directed-broadcast 
! 
interface FastEthernet0/0/0 
 no ip address 
 no ip directed-broadcast 
 full-duplex 
! 
ip classless 
ip route 10.0.0.1 255.255.255.255 ATM0/0/0.4 
! 
end 

Verify

There is currently no verification procedure available for this configuration.

Troubleshoot

There is currently no specific troubleshooting information available for this configuration.

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Related Information

• Cisco DSL Technical Support
• Cisco DSL Product Support
• Technical Support - Cisco Systems