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Cisco 800 Series Routers

Configuring a Cisco 827 Router and a Cisco 6400 Configured With IRB Using RFC1483 Bridging (aal5snap)

Document ID: 12896

Updated: Nov 23, 2007

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Introduction

This sample configuration shows a Cisco 827 Digital Subscriber Line (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 827) 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 827 is in bridging mode and configured as a DHCP server, it will fail in leasing out IP addresses to its local Ethernet clients (such as PCs and UNIX workstations).

You can configure IRB on the Cisco 827 and bridge to an ISP. In this case, the Cisco 827 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 827-4V Customer Premises Equipment (CPE) IOS® Software Release 12.1(1)XB

  • 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 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.

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.

827rfc_6400irb.gif

Configurations

To be able to Telnet to (or ping) the Cisco 827 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 827 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.

Cisco 827
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

Verify

There is currently no verification procedure available for this configuration.

Troubleshoot

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

Related Information

Updated: Nov 23, 2007
Document ID: 12896