- Terminal Services Overview
- Configuring Terminal Operating Characteristics for Dial-In Sessions
- Configuring Dial-In Terminal Services
- Cisco IOS Software Feature Removal
- Configuring AppleTalk Remote Access
- Configuring Support for NASI Clients to Access Network Resources
- Configuring the Cisco PAD Facility for X.25 Connections
- PAD Subaddress Formatting Option
- Configuring Protocol Translation and Virtual Asynchronous Devices
- Asynchronous Line Monitoring
- Authorization for Protocol Translation
- End-of-Record Function for DCNs
- Monitoring Control Characters on Asynchronous Lines
- Protocol Translation Ruleset
- Regular Expressions
- X.3 PAD Parameters
Terminal Services Configuration Guide, Cisco IOS Release 15MT
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
Chapter: Monitoring Control Characters on Asynchronous Lines
- Contents
- Prerequisites for Monitoring Control Characters on Asynchronous Lines
- Information About Monitoring Control Characters on Asynchronous Lines
- How to Configure Monitoring Control Characters on Asynchronous Lines
- Configuration Examples for Monitoring Control Characters on Asynchronous Lines
- Additional References
- Command Reference
Monitoring Control Characters on Asynchronous Lines
The Asynchronous Line Monitoring feature introduced in Cisco IOS Release 12.2(4)T allows the monitoring of inbound and outbound asynchronous character mode traffic on another terminal line. The Monitoring Control Characters on Asynchronous Lines feature enhances the Asynchronous Line Monitoring feature by introducing the ability to monitor control characters along with printable characters. In addition, a keyboard lock has been introduced to prevent characters that are entered at the monitoring workstation from being displayed to the user of the line that is being monitored.
Feature History for Monitoring Control Characters on Asynchronous Lines
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Finding Support Information for Platforms and Cisco IOS Software Images
Use Cisco Feature Navigator to find information about platform support and Cisco IOS software image support. Access Cisco Feature Navigator at http://www.cisco.com/go/fn. You must have an account on Cisco.com. If you do not have an account or have forgotten your username or password, click Cancel at the login dialog box and follow the instructions that appear.
Contents
- Prerequisites for Monitoring Control Characters on Asynchronous Lines
- Information About Monitoring Control Characters on Asynchronous Lines
- How to Configure Monitoring Control Characters on Asynchronous Lines
- Configuration Examples for Monitoring Control Characters on Asynchronous Lines
- Additional References
- Command Reference
Prerequisites for Monitoring Control Characters on Asynchronous Lines
You should understand the Asynchronous Line Monitoring feature before configuring the Monitoring Control Characters on Asynchronous Lines feature.
Information About Monitoring Control Characters on Asynchronous Lines
To configure the Monitoring Control Characters on Asynchronous Lines feature, you should understand the following concepts:
- Asynchronous Line Monitoring
- Control Characters
- The Keyboard Lock
- Benefits of the Monitoring Control Characters on Asynchronous Lines Feature
Asynchronous Line Monitoring
Figure 1 shows a scenario for asynchronous character mode traffic in which a remote user on Workstation 1 uses reverse Telnet to access an asynchronous port of Router A, causing a TTY Daemon process (such as TTY Daemon 1) to run on the asynchronous port of Router A. The user then dials in to an asynchronous port on Router B. The user commands are interpreted by an EXEC process (such as EXEC process 1) on Router B. To monitor the inbound or outbound asynchronous traffic on this port on Router A, you must log in to Router A through another terminal line—for example, another terminal line when logging in from Workstation 2—and enter the monitor traffic line command. The command is interpreted by a second EXEC process (such as EXEC process 2).
Figure 1 Reverse Telnet to a Router Followed by a Dial over a PSTN Connection
Control Characters
The ACSII character set consists of printable and nonprintable characters. Prior to Cisco IOS Release 12.3(8)T, only the printable ASCII characters could be monitored. The Monitoring Control Characters on Asynchronous Lines feature introduces the ability to monitor the nonprintable (control) ASCII characters.
The Keyboard Lock
When asynchronous character traffic is being monitored, the user of the remote monitoring station can enter more commands on the line they are using. In releases prior to Cisco IOS Release 12.3(8)T, the output of the additional commands is displayed not only to the user of the remote monitoring station but also to the user of the terminal line that is being monitored.
In Release 12.3(8)T the default behavior of the monitor traffic line command has been changed so that commands entered by the user on the remote monitoring station are not displayed to the user on the terminal line being monitored. The display of commands entered by the user on the remote monitoring station to the user on the terminal line being monitored can be enabled if desired.
Benefits of the Monitoring Control Characters on Asynchronous Lines Feature
The Monitoring Control Characters on Asynchronous Lines feature enhances the Asynchronous Line Monitoring feature. The following are benefits of the Monitoring Control Characters on Asynchronous Lines feature:
How to Configure Monitoring Control Characters on Asynchronous Lines
This section contains the following procedures:
- Configuring the Display of Control Characters (required)
- Deactivating the Keyboard Lock (optional)
Configuring the Display of Control Characters
Perform this task to include control characters in the display.
SUMMARY STEPS
2.
monitor traffic line [ aux | tty ] line-number [ in | out ] [ control-char ] [ interactive ]
DETAILED STEPS
Deactivating the Keyboard Lock
The keyboard lock is enabled by default. Perform this task to deactivate the keyboard lock.
SUMMARY STEPS
2. monitor traffic line [ aux | tty ] line-number [ in | out ] [ control-char ] [ interactive ]
DETAILED STEPS
Configuration Examples for Monitoring Control Characters on Asynchronous Lines
This section provides the following configuration examples:
Configuring the Display of Control Characters: Example
The following example allows the user to monitor inbound asynchronous character mode traffic, including control characters, on tty line 10:
Deactivating the Keyboard Lock: Example
The following example allows the user to monitor inbound asynchronous character mode traffic on line 5. The interactive keyword turns off the keyboard lock, specifying that commands entered at the remote monitoring station will be displayed to the user of the line being monitored.
Additional References
The following sections provide references related to the Monitoring Control Characters on Asynchronous Lines feature.
Related Documents
Standards
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MIBs
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To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFCs
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Technical Assistance
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.
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