Generación y gestión de

Direct X.25 access between your system and another system requires that the systems share an X.25 network. For both inbound and outbound X.25 communications, each system requires a CONS template for that network. If your system uses more than one X.25 network, identify the OSI Transport Template of the network shared by your system and the target system. If your system lacks the appropriate OSI Template, refer to the DECnet-Plus management documentation for information on setting up additional CONS templates.

Note

For your system to use X.25, both OSI Transport and X.25 access must be properly configured as described in your installation and configuration documentation. Also, both OSI Transport and X.25 must be running.

14.4.3.1 The Call Data Value and Call Mask

Your X.25 subnetwork may also require a call data value to identify the peer transport service provider for an X.25 connection. This call data value can be found in the X.25 access template used for outgoing calls, and the X.25 access filter used for incoming calls.

The ISO Connectionless Network layer (CLNS) specification (ISO 8473) defines this value as 0X81, and CONS defines this value as 03010100. Some X.25 network vendors lack support for sending call data values on connection requests. For more information on call data values, refer to your DECnet-Plus management documentation.

Ensure that the call data value and call mask of the target system reflect the agreements regulating your X.25 network by answering the following question:

Do the system managers of your subnetwork have an established call data value?

If YES

Ensure that your local X.25 Access Template and filter uses the established call data value. Also, ensure that the X.25 Access filter call mask agrees with the instructions in the DECnet-Plus Network Control Language Reference documentation. If the values in the Template display are incorrect, you can use the NCL set x25 access templatecommand to set them, as follows: ncl> disable x25 access template template-name Return

ncl> set x25 access template template-name call_data Return

(need a value for call_data & example of call mask) ncl> enable x25 access template template-name Return

If NO

Clear your local X.25 Access Template’s call data value and call mask fields, as follows:

ncl> disable x25 access template template-name Return

ncl> clear x25 access template template-name CALL_VALUE Return

14.4 Gathering Lower-Layer Addressing Information

Clearing a call data value or call mask causes its value to appear as "not set" on a display.

Note

X.25 Access Templates and filters must be enabled to be used. If the display indicates that the "State" is "Disabled", enable them by entering thencl enable x25 access template template-nameandncl enable x25 access filter filter-name commands.

The following form is intended to help you gather X.25 addressing information on remote systems. The sections following the form provide you with more information on performing this task.

X.25 NETWORK ADDRESSING INFORMATION

Network name Date

Source system: Target system:

Manager(s):

Target System’s Upper-Layer Address

PSAP: . SSAP: . TSAP: .

AP-title (if used): AE-qualifier (if used):

OSI Transport Address for Remote-Application Addresses

OSI Transport address

Source’s CONS OSI Template name

Target’s NSAP destination address (if available)

Target System’s Network Address Components

DTE address [1 - 15 digits]

Call Information

call mask

[FF / other value / not set] call data value

14.4 Gathering Lower-Layer Addressing Information

14.4.3.2 Gathering Remote Addressing Information for TP/CONS Configuration

This section summarizes the information you need for accessing a remote system directly over an X.25 network. Refer to the DECnet-Plus management documentation for more information on configuring X.25.

The X.25 OSI Transport Address

Accessing a remote X.25 network service over CONS requires a local CONS OSI Transport Template name, and either the NSAP destination address of the target system, the DTE destination address of the target system, or both.

• OSI Transport Template name

From the OSI Transport Template database, choose the OSI Transport Template to be used with the subnetwork shared by your system and the target system. If the necessary OSI Transport Template is not on your system, refer to the DECnet-Plus management documentation for information on setting up OSI Templates.

• NSAP Destination address

Use the destination NSAP address of the target system in the OSI Transport address for X.25 network access (the X.25 OSI Transport address).

14.4.3.3 Gathering Local Addressing Information

You may need to provide a remote system manager with your system’s X.25 DTE and NSAP addresses to allow direct X.25 access to your system. You also need to ensure that your call data values agree. Part or all of the local addressing information resides in the OSI Transport Template, and the X.25 Access and X.25 protocol DTE databases. Identify the OSI Transport Template of the X.25 network shared by your system and the target system. If the necessary OSI Transport Template is not on your system, refer to the DECnet-Plus management documentation for information on setting up OSI Transport Templates.

You can display the Template information using theshow osi transport template

command. The following example shows the information for a sample OSI Transport Template named cons.

ncl> show osi transport template cons all Return

Show Node 0 OSI Transport Template cons

at 1992-04-14-08:09:00.69049 + 00:00 I 00.00000 Identifiers

14.4 Gathering Lower-Layer Addressing Information

Characteristics Keepalive Time = 60 Retransmit Threshold = 8 Initial Retransmit Time = 5 CR Timeout = 30

ER Timeout = 30

2 Network Service = CONS Security = %X

Classes = {0, 2, 4} Checksums = False

Maximum NSDU Size = 2048 Expedited Data = True

3 CONS Template = "osi transport" Use CLNS Error Reports = False Acknowledgement Delay Time = 1 Local NSAP

CLNS Inactive Area Address = {} Inbound = True

Loopback = False

1 Simple name assigned to the template when it is created. 2 Type of network service.

3 Name of the X.25 Access module template to be used when establishing a

network connection over CONS. This characteristic points to an X.25 Access module’s template called OSI Transport(shown in the next example).

Notes

Refer to your DECnet-Plus Management documentation for more information on CONS and CLNS network services, and X.25 Access module templates.

Refer to your DECnet-Plus Network Control Language documentation for a full description of the characteristics for the OSI Transport Template.

The following sample display shows the X.25 Access Template called OSI Transport. This is the template pointed to by the CONS Template characteristic of the OSI Transport Template in the previous example.

ncl>sho x25 access template * all

Show Node 0 X25 Access Template "osi transport" at 1992-04-14-08:09:16.96049 + 00:00 I 00.00000 Identifiers

14.4 Gathering Lower-Layer Addressing Information

Characteristics

1 DTE Class = "accunet" Destination DTE Address = Call Data = %X03010100 Local Subaddress = Selected Group = "" Packet Size = 0 Window Size = 0

Throughput Class Request = [0..0] Reverse Charging = False

Fast Select = Not Specified Network User Identity = %X Charging Information = False RPOA Sequence = {}

Transit Delay Selection = [0..0] Calling Address Extension Target Address Extension End-to-End Delay = [0..0] Expedited Data = Not Specified NSAP Mapping = False

Local Facilities = %X Quality Of Service = %X

1 DTE Class is a required field.

Note

Refer to your DECnet-Plus Network Control Language documentation for a full description of the characteristics for the X.25 Access template and protocol DTE Class.

The following form is intended to help you gather IEEE 802 networking information. The sections following the form provide you with information on how to gather the information.

IEEE 802 NETWORK ADDRESSING INFORMATION

Network name Date

Source system: Target system:

Manager(s):

OSI Transport Address for Remote-Application Addresses

OSI Transport address

default

Source’s null OSI Template name

14.4 Gathering Lower-Layer Addressing Information

IEEE 802 NETWORK ADDRESSING INFORMATION