ADTRAN 1200263L1-1.2A User Manual

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ATLAS Router

User Manual

Part Number 1200263L1-1.2A

61200263L1-1.2ASeptember 1998

901 Explorer Boulevard

P.O. Box 140000

Huntsville, AL 35814-4000

(256)963-8000

©1998 ADTRAN, Inc. All Rights Reserved.

Printed in U.S.A.

Table of Contents

List of Figures .....................................................................................................................................................

v

Chapter 1. Router ...........................................................................................................................................

1-1

Router Overview ..............................................................................................................................................

1-1

Features .............................................................................................................................................................

1-2

Specifications ....................................................................................................................................................

1-2

Chapter 2. Technology Overview ...............................................................................................................

2-1

IP Routing .........................................................................................................................................................

2-1

Chapter 3. Operation .....................................................................................................................................

3-1

Overview ...........................................................................................................................................................

3-1

Terminal Menu Structure ................................................................................................................................

3-1

Router Menu .....................................................................................................................................................

3-2

IP Menu .............................................................................................................................................................

3-3

Static Routes ..............................................................................................................................................

3-3

ARP Cache .................................................................................................................................................

3-4

Routes .........................................................................................................................................................

3-5

Interfaces ....................................................................................................................................................

3-7

Chapter 4. Configuration Overview and Examples ................................................................................

4-1

Example 1: IP Routing Network—ATLASas theCentral-SiteRouter ............................................

4-2

Appendix A. Glossary..................................................................................................................................

A-1

Index ..........................................................................................................................................................

Index-1

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List of Figures

Figure 1-1.External Routers ...........................................................................................................................

1-1

Figure 1-2.Internal Routers............................................................................................................................

1-2

Figure 3-1.Router Added to the Main Terminal Menu .............................................................................

3-1

Figure 3-2.Router Menu Tree ........................................................................................................................

3-2

Figure 3-3.IP Routes Menu ............................................................................................................................

3-3

Figure 3-4.Static Routes Menu ......................................................................................................................

3-3

Figure 3-5.ARP Cache Menu .........................................................................................................................

3-4

Figure 3-6.Routes Menu .................................................................................................................................

3-5

Figure 3-7.Interfaces Menu ............................................................................................................................

3-7

Figure 4-1.ATLAS Configured for the Router Option...............................................................................

4-1

Figure 4-2.IP Routing Network with ATLAS as theCentral-SiteRouter ...............................................

4-2

Figure 4-3.Panel for Creating Packet Endpoint ..........................................................................................

4-2

Figure 4-4.

Panel for Creating Sublinks ........................................................................................................

4-3

Figure 4-5.

Panel for Connecting IP Traffic to Internal Router .................................................................

4-3

Figure 4-6.

Panel for Connecting Endpoints to Physical Interface ...........................................................

4-4

Figure 4-7.

Panel for Enabling Routing.........................................................................................................

4-4

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List of Figures

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61200263L1-1.2A

Chapter 1

Router

ROUTER OVERVIEW

The ATLAS router uses the integral 10BaseT Ethernet port to transmit local area network (LAN) traffic over the wide area network (WAN) to a remote LAN. By integrating the router into the network access device, you benefit from the cost savings of not requiring an external router. Figure 1-1and Figure1-2illustrate a conversion from an application with external routers to one using integral routers within ADTRAN products.

Router

F-T1

TSU 100e

ATLAS

Frame

Router

T1

Relay

F-T1

 

 

TSU 100e

Router

Router

F-T1

TSU 100e

Figure 1-1.External Routers

61200263L1-1.2A

ATLAS Router User Manual

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Chapter 1. Router

 

 

 

L

 

 

F-T1

 

A

 

 

 

N

 

 

 

 

 

 

 

TSU 100e

PC

 

 

 

with router module

 

ATLAS 800PLUS

Frame

 

L

 

with router firmware

 

 

F-T1

A

 

T1

Relay

N

 

 

 

 

 

 

TSU 100e

PC

 

 

with router module

 

L

 

 

 

 

A

 

 

L

 

N

 

 

 

 

F-T1

 

A

 

PC

 

N

 

 

 

 

 

 

TSU 100e

PC

 

 

 

with router module

 

Figure 1-2.Internal Routers

The Frame Relay/Router option lets the ATLAS series of Integrated Access Devices act as a voice/data FRAD, a frame relay switch, and an IP router—inaddition to the currently available bandwidth management and switch applications.

FEATURES

The Router option provides the following features:

Routes IP traffic between a public or private frame relay network and the integral 10BaseT Ethernet port.

Routes IP traffic between virtual circuits in a frame relay network.

SPECIFICATIONS

IP Routing

Route Discovery RIP V1

RIP V2

ICMP

DHCP

ARP

IARP

UDP Relay

1-2

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Chapter 2

Technology Overview

 

 

 

IP ROUTING

Internet Protocol (IP) routing is performed at layer 3 of the Open System Interconnection (OSI) model. (Refer to the Frame Relay User Manual for a description of the OSI model.) The routing process determines the optimal path for data packets to travel and then moves the data packets along that path. Routers exchange information about paths or routes that reach additional LAN segments. This exchange of routing information allows a router to build a detailed knowledge of the network topology. Criteria for selecting the best path can include such items as distance, number of hops (servers or routers), and cost of the transportation media.

ATLAS supports Routing Information Protocol (RIP), a protocol based on hops. Each route has a set number of hops (routers or servers) that it must travel through to reach a final destination. If a new route to a host address that has a fewer number of hops is learned, it becomes the preferred route. When a new route is learned, the router increments the hop count by one and immediately broadcasts the new route over the other interfaces. To prevent routing loops, RIP defines a hop count of 16 as an infinite or unreachable route.

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Chapter 2. Technology Overview

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