Avaya X.25 Gateway User Manual
Configuring X.25
Gateway Services
BayRS V ersion 12.00
Site Manager Software Version 6.00
Part No. 117378-A Rev. A
September 1997
4401 Great America Parkway 8 Federal Street
Santa Clara, CA 95054 Billerica, MA 01821
Copyright © 1997 Bay Networks, Inc.
All rights reserved. Printed in the USA. September 1997.
The information in this document is subject to change without notice. The statements, configurations, technical data,
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117378-A Rev. A
Contents
About This Guide
Before You Begin .............................................................................................................. ix
Conventions ....................................................................................................................... x
Acronyms .......................................................................................................................... xi
Ordering Bay Networks Publications ................................................................................xii
Bay Networks Customer Service ......................................................................................xii
How to Get Help ..............................................................................................................xiii
Chapter 1
X.25 Gateway Overview
X.25 Gateway Topology ..................................................................................................1-2
Network Interfaces ..........................................................................................................1-3
X.25 Level 3 (PLP) Interface ....................................................................................1-3
X.25 Level 2 (LAPB-Only) Interface .........................................................................1-3
TCP Interface ...........................................................................................................1-4
What X.25 Gateway Does ..............................................................................................1-4
Protocol Translation ..................................................................................................1-4
Establishing Connections from the X.25 Equipment ................................................1-6
SVCs With a Called X.121 Address ...................................................................1-6
SVCs Without a Called X.121 Address ..............................................................1-7
Permanent Virtual Circuits (PVCs) ....................................................................1-7
Establishing Connections from the X.25 Level 2 (LAPB) Terminal ...........................1-7
Establishing Connections During Failure Conditions for
PVC/TCP Translation ...............................................................................................1-8
Reestablishing the X.25 Connection .................................................................1-8
Reestablishing the TCP/IP Connection .............................................................1-9
Establishing Connections from the TCP/IP Host ......................................................1-9
Connection Summary ...................................................................................................1-11
Handling Large Data Messages ...................................................................................1-12
117378-A Rev. A
v
How X.25 Handles Large Data Messages .............................................................1-12
How TCP Handles Large Data Messages ..............................................................1-12
X.25 Gateway Message Block Options ..................................................................1-13
Chapter 2
Enabling X.25 Gateway
Preparing a Configuration File ........................................................................................2-1
Configuring X.25 IPEX Services .....................................................................................2-1
Enabling X.25 Gateway Services ...................................................................................2-2
Adding an Entry to the IPEX Mapping Table ............................................................2-2
Configuring Mapping Parameters ............................................................................2-7
IPEX Mapping Parameters Windows .......................................................................2-7
Parameters for PVC and SVC Connections .............................................................2-9
Parameters for TCP Connections ...........................................................................2-11
Replicating a Configuration ..........................................................................................2-12
Parameters for Replicating Connections ......................................................................2-18
Index
vi
117378-A Rev. A
Figures
Figure 1-1. Sample Network Topology Using X.25 Gateway ......................................1-2
Figure 1-2. How X.25 Gateway Establishes a Session (X.25 Initiated) ......................1-5
Figure 1-3. Reestablishing X.25 Connections ............................................................1-8
Figure 1-4. Reestablishing TCP/IP Connections ........................................................1-9
Figure 1-5. How X.25 Gateway Establishes a Session (TCP Initiated) ....................1-10
Figure 1-6. Role of the X.25 and TCP Protocol Stacks in X.25 Gateway .................1-11
Figure 2-1. IPEX Mapping Add Window for Source PVC ...........................................2-3
Figure 2-2. IPEX Mapping Parameters Window for PVC ...........................................2-8
Figure 2-3. IPEX Mapping Parameters Window for SVC ...........................................2-8
Figure 2-4. IPEX Mapping Parameters Window for TCP ............................................2-9
Figure 2-5. IPEX Mapping Table Configuration Window ...........................................2-13
Figure 2-6. IPEX Mapping Replication Window ........................................................2-15
Figure 2-7. IPEX Mapping Table Configuration Window After Replicating a
PVC-to-TCP Connection ........................................................................2-16
Figure 2-8. IPEX Mapping Table Configuration Window After Replicating a
TCP-to-PVC Connection ........................................................................2-17
117378-A Rev. A
vii
About This Guide
If you are responsible for configuring X.25 Gateway services, you need to read
this guide.
If you want to Go to
Learn about the X.25 Gateway protocol and special aspects of the Bay
Networks implementation of X.25 Gateway
Start X.25 Gateway on a router and configure Gateway parameters Chapter 2
Before Y ou Begin
Before using this guide, you must complete the following procedures. For a new
router:
• Install the router (refer to the installation manual that came with your router).
• Connect the router to the network and create a pilot configuration file (refer to
Quick-Starting Routers, Configuring BayStack Remote Access
ASN Routers to a Network)
Make sure that you are running the latest version of Bay Networks Site Manager
and router software. For instructions, refer to
7–11.xx to Version 12.00
Chapter
, or
1
Connecting
.
Upgrading Routers from Version
.
117378-A Rev. A
ix
Configuring X.25 Gateway Services
Conventions
bold text
Indicates text that you need to enter, command names,
and buttons in menu paths.
Example: Enter
Example: Use the
Example: ATM DXI > Interfaces >
wfsm &
dinfo
command.
PVCs
identifies the
PVCs button in the window that appears when you
select the Interfaces option from the ATM DXI menu.
italic text
Indicates variable values in command syntax
descriptions, new terms, file and directory names, and
book titles.
quotation marks (“ ”) Indicate the title of a chapter or section within a book.
screen text
Indicates data that appears on the screen.
Example:
Set Bay Networks Trap Monitor Filters
separator ( > ) Separates menu and option names in instructions and
internal pin-to-pin wire connections.
Example: Protocols > AppleTalk identifies the
AppleTalk option in the Protocols menu.
Example: Pin 7 > 19 > 20
vertical line (|) Indicates that you enter only one of the parts of the
command. The vertical line separates choices. Do not
type the vertical line when entering the command.
Example: If the command syntax is
show at routes
show at routes
x
nets
, you enter either
|
show at nets
or
, but not both.
117378-A Rev. A
Acronyms
About This Guide
CCITT International Telegraph and Telephone Consultative Committee
(now ITU-T)
DCE data circuit-terminating equipment
DDN Defense Data Network
DTE data terminal equipment
FDDI Fiber Distributed Data Interface
IP Internet Protocol
IPEX IP Encapsulation of X.25
ITU-T International T elecommunications Union–Telecommunications
(formerly CCITT)
LAN local area network
LAPB Link Access Procedure Balanced
LCN logical channel number
MAN metropolitan area network
MIB Management Information Base
MCT1 Multichannel T1
MTU maximum transmission unit
PDN Public Data Network
PLP Packet Layer Protocol
PPP Point-to-Point Protocol
PToP Point-to-Point (Bay Networks proprietary)
PVC permanent virtual circuit
SNMP Simple Network Management Protocol
SVC switched virtual circuit
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
Telnet Telecommunication Network
TFTP Trivial File Transfer Protocol
WAN wide area network
117378-A Rev. A
xi
Configuring X.25 Gateway Services
Ordering Bay Networks Publications
To purchase additional copies of this document or other Bay Networks
publications, order by part number from Bay Networks Press
numbers:
• Phone--U.S./Canada: 888-422-9773
• Phone--International: 510-490-4752
• FAX--U.S./Canada and International: 510-498-2609
The Bay Networks Press catalog is available on the World Wide Web at
support.baynetworks.com/Library/GenMisc
available on the W orld W ide Web at
support.baynetworks.com/Library/tpubs
Bay Networks Customer Service
You can purchase a support contract from your Bay Networks distributor or
authorized reseller, or directly from Bay Networks Services. For information
about, or to purchase a Bay Networks service contract, either call your local Bay
Networks field sales office or one of the following numbers:
™
at the following
. Bay Networks publications are
.
xii
Region Telephone number Fax number
United States and
Canada
Europe 33-4-92-96-69-66 33-4-92-96-69-96
Asia/Pacific 61-2-9927-8888 61-2-9927-8899
Latin America 561-988-7661 561-988-7550
800-2LANWAN; then enter Express
Routing Code (ERC) 290, when prompted,
to purchase or renew a service contract
978-916-8880 (direct)
978-916-3514
Information about customer service is also available on the World Wide Web at
support.baynetworks.com
.
117378-A Rev. A
How to Get Help
If you purchased a service contract for your Bay Networks product from a
distributor or authorized reseller, contact the technical support staff for that
distributor or reseller for assistance.
If you purchased a Bay Networks service program, call one of the following Bay
Networks Technical Solutions Centers:
Technical Solutions Center Telephone number Fax number
Billerica, MA 800-2LANWAN 978-916-3514
Santa Clara, CA 800-2LANWAN 408-495-1188
Valbonne, France 33-4-92-96-69-68 33-4-92-96-69-98
Sydney, Australia 61-2-9927-8800 61-2-9927-8811
Tokyo, Japan 81-3-5402-0180 81-3-5402-0173
About This Guide
117378-A Rev. A
xiii
Chapter 1
X.25 Gateway Overview
X.25 Gateway lets you send and receive messages between X.25 and
Transmission Control Protocol/Internet Protocol (TCP/IP) networks. It maps TCP
sockets to X.25 virtual circuits (and vice versa) or to Link Access Procedure
Balanced (LAPB) point-to-point connection identifiers.
The Gateway software supports X.25 permanent virtual circuits (PVCs) and
switched virtual circuits (SVCs), as well as TCP/IP over all interface types
supported in the Bay Networks router.
117378-A Rev. A
X.25 Gateway supports:
• TCP/IP over Fiber Distributed Data Interface (FDDI), Ethernet, and token
ring LAN media, or over X.25, frame relay, Asynchronous Transfer Mode
(ATM), and switched multimegabit data service (SMDS), wide area network
(WAN), or metropolitan area network (MAN) media
• X.25 Levels 2 and 3 over synchronous interfaces (6 MB/s and below) or
Multichannel T1 (MCT1) interfaces
• 10 VCs per logical channel for the FRE2-040-32MB platform, for a total of
240VCs per slot
• 32 VCs per channel for the FRE1-060-64MB, for a total of 310VCs per slot
Use Site Manager’s Configuration Manager to configure a system for X.25
Gateway services.
1-1
Configuring X.25 Gateway Services
X.25 Gateway Topology
igure 1-1 shows a topology consisting of two Bay Networks router systems and a
F
TCP/IP network. The top system serves as a TCP/IP-to-X.25 gatew ay. The bottom
system serves as a TCP/IP-to-LAPB gateway. In this example, terminals
connected to X.25 networks can exchange messages with host systems on a
TCP/IP network through the Bay Networks routers using the X.25 Gateway
service.
X.25
terminals
Physical
(V.35) links
X.25
concentrator
LAPB
concentrator
X.25 Level 3
connections
V.35 or
T1 links
V.35 or
T1 links
X.25 Level
(LAPB)
connections
X.25
gateway
router
X.25
gateway
router
TCP
connections
TCP/IP
Figure 1-1. Sample Network Topology Using X.25 Gateway
The router translates data received from X.25 virtual connections into TCP data
packets and forwards those packets out through TCP connections. The router also
translates data received from TCP connections into X.25 data and forwards the
data out through X.25 connections. You can connect the equipment to the router
by a leased line, an X.25 packet-switched network, or a T1 or E1 circuit-switched
network.
You can also configure the router as a TCP/IP-to-CCITT (now ITU-T) X.25 Level
2 gateway as in the bottom part of F
igure 1-1. This configuration allows access
from LAPB-based (X.25 Level 2) equipment with no X.25 Level 3 support. This
manual refers to this feature as
LAPB-only support.
TCP/IP
host
TCP/IP
host
X250022A
1-2
With this configuration, the router translates data received from LAPB
connections to TCP data packets and forwards those packets out through TCP
connections. It also translates data received from TCP connections to LAPB data
and forwards the data out through LAPB connections.
117378-A Rev. A
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