Configuring a Cisco SOHO77 Router With RFC1483 Routing, IP, and AAL5SNAP Encapsulation

Document ID: 12927

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

Introduction

This sample configuration shows a Cisco SOHO77 Digital Subscriber Line (DSL) Router configured with AAL5SNAP routing and terminating on a Cisco 6400 Universal Access Concentrator (UAC). Both the Cisco SOHO77 and the Cisco 6400 use an IP unnumbered interface. This type of interface is well-suited for situations in which the number of available IP subnets is restricted.

The asynchronous transfer mode (ATM) main interface does not support the ip unnumbered command; use ATM point-to-point subinterfaces.

The RFC1483 routing service connects subscribers to a Cisco 6400 using AAL5SNAP encapsulation to carry IP traffic over ATM. The node route processor (NRP) routes the IP traffic as required.

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-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.

Cisco SOHO77
Cisco 6400-NRP

Cisco SOHO77

Current configuration:
!
version 12.1
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1  
ip subnet-zero
! 
interface Ethernet0
ip address 10.0.0.1 255.0.0.0
no ip directed-broadcast
!
interface ATM0
no ip address
no ip directed-broadcast
no ip mroute-cache
no atm ilmi-keepalive
bundle-enable
hold-queue 224 in
!
interface ATM0.1 point-to-point
ip unnumbered Ethernet0
no ip directed-broadcast
pvc 3/100 
protocol ip 172.16.0.2
encapsulation aal5snap
! 
ip classless
ip route 172.16.0.2 255.255.255.255 ATM0.1
no ip http server
!
dialer-list 1 protocol ip permit
!

line con 0 
end

Cisco 6400-NRP

Current configuration:
!
version 12.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname NRP
! 
redundancy
main-cpu
auto-sync standard
no secondary console enable
ip subnet-zero
! 
interface Loopback1
ip address 172.16.0.2 255.255.0.0
no ip directed-broadcast
!
interface ATM0/0/0
no ip address
no ip directed-broadcast
no ip mroute-cache
no atm ilmi-keepalive
!
interface ATM0/0/0.3 point-to-point
ip unnumbered Loopback1
no ip directed-broadcast
no ip mroute-cache
pvc 3/100 
protocol ip 10.0.0.1
encapsulation aal5snap
! 
interface Ethernet0/0/1
no ip address
no ip directed-broadcast
!
interface Ethernet0/0/0
no ip address
no ip directed-broadcast
shutdown
!
interface FastEthernet0/0/0
no ip address
no ip directed-broadcast
half-duplex
!
ip classless 
ip route 10.0.0.1 255.255.255.255 ATM0/0/0.3
ip http server
!
!
line con 0
transport input none
line aux 0
line vty 0 4
login
!
end

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