ATLAS Router
User Manual
Part Number 1200263L1-1.2A
61200263L1-1.2A
September 1998
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
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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 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
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List of Figures
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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.
Router
F-T1
TSU 100e
ATLAS
Frame
Relay
Router
T1
F-T1
TSU 100e
Router
Router
F-T1
TSU 100e
Figure 1-1. External Routers
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Chapter 1. Router
L
A
N
F-T1
PC
TSU 100e
with router module
ATLAS 800PLUS
with router firmware
L
A
N
Frame
Relay
T1
F-T1
PC
TSU 100e
with router module
L
A
N
L
A
N
F-T1
PC
PC
TSU 100e
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 applica-
tions.
FEATURES
The Router option provides the following features:
•
•
Routes IP traffic between a public or private frame relay network and the inte-
gral 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
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Chapter 2
Technology Overview
IP ROUTING
Internet Protocol (IP) routing is performed at layer 3 of the Open System Intercon-
nection (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 infor-
mation about paths or routes that reach additional LAN segments. This exchange
of routing information allows a router to build a detailed knowledge of the net-
work topology. Criteria for selecting the best path can include such items as dis-
tance, 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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Chapter 3
Operation
OVERVIEW
The Router Upgrade provides remote connectivity of LANs within an ATLAS—
from LAN-to-WAN connection or from WAN-to-WAN connection. The Router
Upgrade is included as part of the frame relay upgrade and includes an IP Router.
TERMINAL MENU STRUCTURE
The ATLAS uses hierarchical menus to access all of its features. The top-most
menu level leads to submenus which are grouped by functionality. All menu
items display in the terminal window.
Refer to the ATLAS User Manual for detailed instructions on how to navigate
through the terminal menu.
When the Router Option is enabled, the Router Menu is added to the main termi-
nal menu (see Figure 3-1). All routing functions within ATLAS are configured
and monitored from the Router Menu.
Figure 3-1. Router Added to the Main Terminal Menu
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Chapter 3. Operation
ROUTER MENU
The Router Menu defines, configures, and monitors all ATLAS Router options. Fig-
ure 3-2 displays the IP Router menu tree.
IP Address
Netmask
Static Routes
ARP Cache
Gateway
Interface
Hops
IP Address
MAC Address
Time
Type
IP
Interface
TX Pending
IP Address
Netmask
Gateway
Interface
Used
Routes
Flags
Hops
TTL
Network Name
Address
Subnet Mask
IARP
Interfaces
Mode
Far-End Address
MTU
Protocol
Method
Updates
V2 Secret
RIP
Figure 3-2. Router Menu Tree
3-2
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