PAD Subaddress Formatting Option
Prior to Cisco IOS Release 12.3(2)T, packet assembler/disassembler (PAD) Subaddressing specifies a two-digit field for subaddressing that requires a leading zero for subaddress values of nine or lower (0-9). The PAD Subaddress Formatting Option feature introduces the ability to suppress the leading zero for subaddresses with a value of nine or lower. This suppression occurs before the subaddress field is appended to the calling address. This feature increases compatibility with X.25 host systems that use single-digit subaddresses.
Feature History for the PAD Subaddress Formatting Option Feature
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Cisco IOS XE Gibraltar 16.10.1 |
This feature was introduced. |
Finding Support Information for Platforms and Cisco IOS Software Images
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Restrictions for PAD Subaddress Formatting Option
X.25 subaddresses in the range from 1 to 99 are tied to rotary groups and can be only two digits in length.
The PAD Subaddress Formatting Option feature is available for the following line types:
The PAD Subaddress Formatting Option feature is supported for the following connection types:
Information About PAD Subaddress Formatting Option
To configure the PAD Subaddress Formatting Option feature, you must understand the following concepts:
PAD Subaddress Values
PAD subaddressing enables an X.25 host application to uniquely identify the source of an X.121 call. In some situations, the X.121 calling address alone is not sufficient to identify the source of the call. PAD subaddressing allows you to create unique X.121 calling addresses by including either a physical port number or an explicit value to be specified for a line as a subaddress to the X.121 calling address.
The PAD Subaddress Formatting Option feature introduces the option to exclude the leading zero from PAD subaddress with a value of nine or lower (0-9). This option affects only the formatting of the PAD subaddress, not the value of the PAD subaddress. The PAD subaddress 02 has exactly the same value as the PAD subaddress 2.
A single Cisco router can be configured to generate PAD subaddresses with and without leading zeros on different lines or sets of lines.
Benefits of the PAD Subaddress Formatting Option
This feature increases compatibility with X.25 host systems that use single-digit subaddresses.
How to Configure PAD Subaddress Formatting Option
This section contains the following procedure:
Configuring the PAD Subaddress Formatting Option
This task configures a set of lines to suppress the leading zero for subaddresses with a value of nine or lower (0-9).
SUMMARY STEPS
1. enable
2. configure terminal
3. line [ aux | console | tty | vty ] line-number [ ending-line-number ]
4. x25 subaddress { line | number } [ no-zero-pad ]
DETAILED STEPS
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Step 1 |
enable
Router> enable |
Enables privileged EXEC mode.
- Enter your password if prompted.
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Step 2 |
configure terminal
Router# configure terminal |
Enters global configuration mode. |
Step 3 |
line [ aux | console | tty | vty ] line-number [ ending-line-number ]
Router(config)# line vty 1 9 |
Enters line configuration mode and identifies a specific line or set of lines for configuration. |
Step 4 |
x25 subaddress { line | number } [ no-zero-pad ]
Router(config-line)# x25 subaddress 6 no-zero-pad |
Appends either a physical port number or a value specified for a line as a subaddress to the X.121 calling address.
- no-zero-pad —Specifies that a leading zero should not be appended to subaddresses with a value of nine or lower (0-9).
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Configuration Examples for PAD Subaddress Formatting Option
This section contains the following configuration examples:
Configuring the PAD Subaddress Formatting Option Example
The following example configures a subaddress of 6 for a set of vty lines, and specifies that a leading zero should not be appended to the subaddress value:
Router(config)# line vty 0 9
Router(config-line)# x25 subaddress 6 no-zero-pad
Verifying Configuration of the PAD Subaddress Formatting Option Example
To verify the configuration of the PAD Subaddress Formatting Option, enter the show line command as shown in the following example:
Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int
66 VTY - - - - - 0 0 0/0 -
Line 66, Location: "", Type: ""
Length: 24 lines, Width: 80 columns
Baud rate (TX/RX) is 9600/9600
Capabilities: PAD Sub-addressing Used, No Leading Zeros
Special Chars: Escape Hold Stop Start Disconnect Activation
Timeouts: Idle EXEC Idle Session Modem Answer Session Dispatch
Idle Session Disconnect Warning
Login-sequence User Response
Additional References
The following sections contain additional information related to the PAD Subaddress Formatting Option feature.
Technical Assistance
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Technical Assistance Center (TAC) home page, containing 30,000 pages of searchable technical content, including links to products, technologies, solutions, technical tips, and tools. Registered Cisco.com users can log in from this page to access even more content. |
http://www.cisco.com/public/support/tac/home.shtml |
Command Reference
The following commands are introduced or modified in the feature or features documented in this module. For information about these commands, see the Cisco IOS Terminal Services Command Reference at http://www.cisco.com/en/US/docs/ios/termserv/command/reference/tsv_book.html. For information about all Cisco IOS commands, go to the Command Lookup Tool at http://tools.cisco.com/Support/CLILookup or to the Cisco IOS Master Commands List.
Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.
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