To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www. An account on Cisco. The use of Tcl server sockets to listen to telnet and FTP ports 23 and 21 respectively will preempt the normal handling of these ports in Cisco IOS software. Commands entered using the after Tcl command will not run unless forced using the update command.
Sleep mode the after command works only with the ms keyword. The optional -time keyword to set the file access time is not supported in Cisco IOS software. The optional -time keyword to set the file modification time is not supported in Cisco IOS software. Commands entered using the fileevent Tcl command will not run unless forced using the update command. Use the history Tcl command with the redo n keyword. These subsystems have their own proprietary commands and keyword options that are not available in the Tcl shell. A Tcl shell can be enabled, and Tcl commands can be entered line by line.
After Tcl commands are entered, they are sent to a Tcl interpreter. If the commands are recognized as valid Tcl commands, the commands are executed and the results are sent to the TTY device. It is also possible to create a Tcl script and precompile the code before running it under Cisco IOS software.
Multiple users on the same router can be in Tcl configuration mode at the same time without interference because each Tcl shell session launches a separate interpreter and Tcl server process. The TTY interface number served by each Tcl process is represented in the server process name and can be displayed using the show process CLI command. Using the Tcl shell to run CLI commands allows customers to build menus to guide novice users through tasks, to automate repetitive tasks, and to create custom output for show commands.
Precompiled scripts allow a measure of security and consistency because they are obfuscated. The Tcl shell is enabled either manually or by using a Tcl script, and the new commands can be entered to allow you to perform specified get and set actions on MIB objects. These extensions operate only under Tcl configuration mode. The table below displays these command extensions.
Specifies the options in a channel and enables you to associate a virtual routing and forwarding VRF table name with it.
Retrieves a large section of a MIB table. This command is similar to the SNMP getbulk command. The syntax is in the following format:. This command is similar to the SNMP getid command. Retrieves a set of individual variables from the SNMP entity on the router. This command is similar to the SNMP getnext command. This command is similar to the SNMP getone command.
Retrieves the current values of the specified variables and then performs a set request on the variables.
This command is similar to the SNMP setany command. Optional steps include specifying a default location for encoding files and specifying an initialization script. Enter the required Tcl command language syntax.
Precompiled scripts allow a measure of security and consistency because they are obfuscated. Either way, the script launches and runs to completion. Join us on Youtube! Using the Tcl regular expression engine, scripts can filter specific information from show commands and present it in a custom format. I needed the output from the puts command to look like it does in the above code that the authors provided. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.
Optional Specifies the default location of external encoding files used by the Tcl encoding command. Optional Specifies a low water memory mark for free memory for Tcl-based applications. The memory threshold can be set anywhere between bytes.
This prevents the Tcl interpreter from allocating too much RAM and crashing the router. Commands entered in Tcl configuration mode are sent first to the interactive Tcl interpreter. If the command is not a valid Tcl command, it is then sent to the CLI parser. All arguments and submode commands must be entered on the same line as the CLI configuration command.
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You can specify a port and host to connect to; there must be a server to accept connections on this port. If the port is zero, Cisco IOS will allocate a free port to the server socket by using fconfigure command to read the - sock0 argument. The following sample partial output shows information about Ethernet interface 0 on the router. The show interfaces command has been executed from Tcl configuration mode.
Use the Tcl puts command in a Tcl script to trace command execution. Perform this task to enable the interactive Tcl shell and enter Tcl commands to perform actions on MIB objects. If the command is not a valid Tcl command, it is sent to the CLI parser. Optional Retrieves current values of specified variables from a MIB table and then performs a set request on the variables.
The Tcl script may also be sourced from a remote location. Enter the Tcl source command with the filename and path. Using the Tcl regular expression engine, scripts can filter specific information from show commands and present it in a custom format. The following is an example of filtering the show interfaces command output and creating a comma-separated list of BRI interfaces on the router:. The following example shows how to set up the community access strings to permit access to SNMP.
Public access is read-only, but private access is read-write. In this example, three bindings--sysUpTime 1. Sample results for the individual variables include a retrieved value of sysUpTime. The retrieved value of ifDescr. The following example shows how to retrieve the sysDescr. Network Management commands including Tcl and logging commands : complete command syntax, defaults, command mode, command history, usage guidelines, and examples.
No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature. No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature. No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature. Please try again later. We'll let you know when a new response is added.