Configuring a Cisco SOHO77 Router and a Cisco 6400 Configured With IRB Using RFC1483 Bridging (aal5snap)

Document ID: 12929

Introduction
Before You Begin
      Conventions
      Prerequisites
      Components Used
Configure
      Network Diagram
      Configurations
Verify
Troubleshoot
Related Information

Introduction

This sample configuration shows a Cisco SOHO77 DSL Router connecting to a Cisco 6130 Digital Subscriber Line Access Multiplexer (DSLAM) and terminating on a Cisco 6400 Universal Access Concentrator (UAC) configured with Integrated Routing and Bridging (IRB).

Note: A Cisco client router (Cisco SOHO77) that is in a full bridge mode cannot function as a Dynamic Host Configuration Protocol (DHCP) server for its local LAN clients. If the Cisco SOHO77 is in bridging mode and configured as a DHCP server, it will fail in leasing out IP addresses to its local Ethernet clients (PCs, UNIX workstations, and so forth).

You can configure IRB on the Cisco SOHO77 and bridge to an ISP. In this case, the Cisco SOHO77 can be configured as a DHCP server and Network Address Translation (NAT) and be able to lease out IP addresses from its local pool to its LAN clients.

Before You Begin

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

Prerequisites

There are no specific prerequisites for this document.

Components Used

The information in this document is based on the software and hardware versions below.

Cisco SOHO77 customer premises equipment (CPE) IOS® Software Release 12.1(3)XP2
Cisco 6400 UAC-node route processor (NRP) IOS Software Release 12.1(3)DC1
Cisco 6400 UAC-node switch processor (NSP) IOS Software Release 12.1(3)DB
Cisco 6130 DSLAM-NI2 IOS Software Release 12.1(5)DA

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.

Configure

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

To be able to Telnet to (or ping) the Cisco SOHO77 from the Internet, you must configure an IP address and a MAC address on the ATM interface. For the IP address, configure the same IP address on the ATM interface that you configured on the Ethernet interface. For the MAC address, issue the show interface eth0 command. Note the MAC address and configure this same MAC address on the ATM interface.

When the Cisco SOHO77 is bridging IP on the Ethernet and ATM interfaces, both interfaces can have the same IP address.

Note the no ip routing command in the configuration.

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 the network setup shown in the diagram below.

Configurations

This document uses the configurations shown below.

Cisco SOHO77
Cisco Access 6400 NRP1

Cisco SOHO77

Current configuration: 
! 
version 12.1 
service timestamps debug datetime msec 
service timestamps log datetime msec
no service password-encryption
! 
hostname R1 
! 
ip subnet-zero 
no ip routing 
! 
interface Ethernet0 
 ip address 10.0.0.1 255.0.0.0 
 no ip directed-broadcast 
 no ip mroute-cache 
 bridge-group 1 
! 
interface Atm0
 mac-address 0030.96f8.45bd 
 ip address 10.0.0.1 255.0.0.0
 no ip directed-broadcast
 no ip mroute-cache 
 no atm ilmi-keepalive 
 pvc 1/150 
  encapsulation aal5snap 
 ! 
 bundle-enable 
 bridge-group 1 
 hold-queue 224 in 
! 
ip classless 
no ip http server 
! 
bridge 1 protocol ieee 
! 
end

Cisco Access 6400 NRP1

bridge irb
!
interface ATM0/0/0.200 point-to-point 
 no ip directed-broadcast
 pvc 1/301 
  encapsulation aal5snap 
 ! 
 bridge-group 1 
!
interface BVI1 
 ip address 10.0.0.2 255.0.0.0 
 no ip directed-broadcast 

bridge 1 protocol ieee 
 bridge 1 route ip 
 !
end

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