ADTRAN 1200263L1-1.2A User Manual
ATLAS Router
User Manual
Part Number 1200263L1-1.2A
61200263L1-1.2A
September 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—ATLAS as the Central-Site Router ............................................ 4-2
Appendix A. Glossary.................................................................................................................................. A-1
Index ..........................................................................................................................................................Index-1
61200263L1-1.2A ATLAS Router User Manual iii
Table of Contents
iv ATLAS Router User Manual 61200263L1-1.2A
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 the Central-Site Router...............................................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
61200263L1-1.2A ATLAS Router User Manual v
List of Figures
vi ATLAS Router User Manual 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 1-1 and Figure 1-2 illustrate a
conversion from an application with external routers to one using integral routers
within ADTRAN products.
ATLAS
Router
F-T1
Frame
T1
Figure 1-1. External Routers
Relay
F-T1
F-T1
Router
TSU 100e
Router
TSU 100e
Router
TSU 100e
61200263L1-1.2A ATLAS Router User Manual 1-1
Chapter 1. Router
F-T1
L
A
N
TSU 100e
PC
with router module
ATLAS 800
with router firmware
PLUS
T1
Fr ame
Relay
F-T1
L
A
N
TSU 100e
with router module
L
A
N
PC
F-T1
TSU 100e
L
A
N
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—in
addition to the currently available bandwidth management and switch applications.
PC
FEATURES
The Router option provides the following features:
• Routes IP traffic between a public or private frame relay network and the inte-
• Routes IP traffic between virtual circuits in a frame relay network.
SPECIFICATIONS
gral 10BaseT Ethernet port.
IP Routing
Route Discovery
RIP V1
RIP V2
ICMP
DHCP
ARP
IARP
UDP Relay
1-2 ATLAS Router User Manual 61200263L1-1.2A
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 se lecting 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.
61200263L1-1.2A ATLAS Router User Manual 2-1
Chapter 2. Technology Overview
2-2 ATLAS Router User Manual 61200263L1-1.2A
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