Configuring a Cisco 827 Router With IRB, NAT, DHCP, and a Cisco 6400 With IRB Using RFC1483 Bridging (aal5snap)

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Updated:February 26, 2008

Document ID:12899

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Introduction

Before You Begin

Conventions

Prerequisites

Components Used

Configure

Network Diagram

Configurations

Verify

Troubleshoot

Related Information

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).

The Cisco 827 is configured as follows:

With Integrated Routing and Bridging (IRB)
Using encapsulation
With Network Address Translation (NAT)
As a Dynamic Host Configuration Protocol (DHCP) server that will lease IP addresses to its local Ethernet clients

The Cisco 6400 is configured with IRB.

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-Node Route Processor (NRP) IOS Software Release 12.0(7)DC
Cisco 6400 UAC-Node Switch Processor (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.

Configurations

This document uses the configurations shown below.

Cisco 827
Cisco Access 6400 NRP

Cisco 827
Current configuration: ! version 12.0 service timestamps debug datetime msec service timestamps log datetime msec ! hostname R1 ! ip subnet-zero ! ip dhcp excluded-address 10.0.0.1 ! ip dhcp pool *<pool name>* network 10.0.0.0 255.0.0.0 default-router 10.0.0.1 ! bridge irb ! interface Ethernet0 ip address 10.0.0.1 255.0.0.0 no ip directed-broadcast ip nat inside no ip mroute-cache ! interface ATM0 no ip address 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 ! interface BVI1 ip address 172.16.0.1 255.255.0.0 no ip directed-broadcast ip nat outside ! ip nat inside source list 1 interface BVI1 overload ip classless ip route 0.0.0.0 0.0.0.0 172.16.0.2 no ip http server ! access-list 1 permit 10.0.0.0 0.255.255.255 bridge 1 protocol ieee bridge 1 route ip ! voice-port 1 timing hookflash-in 0 ! voice-port 2 timing hookflash-in 0 ! voice-port 3 timing hookflash-in 0 ! voice-port 4 timing hookflash-in 0 ! end

Cisco 827

Current configuration: 
! 
version 12.0 
service timestamps debug datetime msec 
service timestamps log datetime msec 
!
hostname R1 
! 
ip subnet-zero 
! 
ip dhcp excluded-address 10.0.0.1
!
ip dhcp pool 
<pool name>
 
   network 10.0.0.0 255.0.0.0 
   default-router 10.0.0.1
! 
bridge irb 
! 
interface Ethernet0 
 ip address 10.0.0.1 255.0.0.0 
 no ip directed-broadcast 
 ip nat inside
 no ip mroute-cache 
! 
interface ATM0 
 no ip address 
 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
! 
interface BVI1 
 ip address 172.16.0.1 255.255.0.0 
 no ip directed-broadcast 
 ip nat outside
! 
ip nat inside source list 1 interface BVI1 overload 
ip classless 
ip route 0.0.0.0 0.0.0.0 172.16.0.2 
no ip http server 
! 
access-list 1 permit 10.0.0.0 0.255.255.255
bridge 1 protocol ieee 
 bridge 1 route ip
! 
voice-port 1 
 timing hookflash-in 0 
!
voice-port 2 
 timing hookflash-in 0
!
voice-port 3
 timing hookflash-in 0 
! 
voice-port 4 
 timing hookflash-in 0 
! 
end

Cisco Access 6400 NRP
Current configuration: ! version 12.0 service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname NRP ! ip subnet-zero ! bridge irb ! interface ATM0/0/0 no ip address no ip directed-broadcast no ip route-cache no ip mroute-cache no atm ilmi-keepalive ! interface ATM0/0/0.300 point-to-point no ip directed-broadcast no ip route-cache pvc 1/150 encapsulation aal5snap ! bridge-group 1 ! 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 ! interface BVI1 ip address 172.16.0.2 255.255.0.0 no ip directed-broadcast ! no ip http server ! bridge 1 protocol ieee bridge 1 route ip ! end

Cisco Access 6400 NRP

Current configuration:
! 
version 12.0
service timestamps debug datetime msec 
service timestamps log datetime msec 
no service password-encryption 
! 
hostname NRP
! 
ip subnet-zero 
! 
bridge irb 
! 
interface ATM0/0/0 
 no ip address 
 no ip directed-broadcast 
 no ip route-cache 
 no ip mroute-cache 
 no atm ilmi-keepalive 
!
interface ATM0/0/0.300 point-to-point 
 no ip directed-broadcast
 no ip route-cache 
 pvc 1/150 
  encapsulation aal5snap 
 ! 
 bridge-group 1 
! 
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 
! 
interface BVI1 
 ip address 172.16.0.2 255.255.0.0 
 no ip directed-broadcast 
! 
no ip http server 
!
bridge 1 protocol ieee 
 bridge 1 route ip 
! 
end

In order to make sure that the wireless clients can communicate among them, configure the bridge-group 1 command on the radio interface.

When the bridge-group 1 command is issued on the radio interface, these commands are automatically issued:

bridge-group 1 subscriber-loop-control
bridge-group 1 spanning-disabled
bridge-group 1 block-unknown-source

Do not disable these commands. These commands are required for the wireless communication to occur. If these commands are disabled, wireless clients may not be able to communicate with each other.

Also, if the bridge-group command is not configured for the VLAN, the wireless clients are not able to get the IP address from the Dynamic Host Configuration Protocol (DHCP) server on one of the VLANs.