Cisco Catalyst 2960 Series, Руководство по настройке

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• file system
• file type
•
file volumes
•
file writable
• glob --The glob command is not permitted when searching in one of the restricted Cisco directories.
Otherwise, it is permitted.
• load --Only files that are in the user policy directory or the user library directory are permitted to be
loaded. Static packages (for example, libraries that consist of C code) are not permitted to be loaded
with the
load command.
• open --The open command is not allowed for a file that is located in one of the restricted Cisco directories.
•
pwd
--The
pwd
command is not permitted.
•
socket
--The
socket
command is permitted.
• source --The source command is permitted for files that are in the user policy directory or the user
library directory.
Bytecode Support for EEM 2.4
EEM 2.4 introduces bytecode language (BCL) support by accepting files with the standard bytecode script
extension .tbc. Tcl version 8.3.4 defines a BCL and includes a compiler that translates Tcl scripts into BCL.
Valid EEM policy file extensions in EEM 2.4 for user and system policies are .tcl (Tcl Text files) and .tbc
(Tcl bytecode files).
Storing Tcl scripts in bytecode improves the execution speed of the policy because the code is precompiled,
creates a smaller policy size, and obscures the policy code. Obfuscation makes it a little more difficult to
modify scripts and hides logic to preserve intellectual property rights.
Support for bytecode is being added to provide another option for release of supported and trusted code. We
recommend that you only run well understood, or trusted and supported software on network devices. To
generate Tcl bytecode for IOS EEM support, use TclPro versions 1.4 or 1.5.
To translate a Tcl script to bytecode you can use procomp, part of Free TclPro Compiler, or Active State Tcl
Development Kit. When a Tcl script is compiled using procomp, the code is scrambled and a .tbc file is
generated. The bytecode files are platform-independent and can be generated on any operating system on
which TclPro is available, including Windows, Linux, and UNIX. Procomp is part of TclPro and available
from
http://www.tcl.tk/software/tclpro .
Registration Substitution
In addition to regular Tcl substitution, EEM 2.3 permits the substitution of an individual parameter in an EEM
event registration statement line with an environment variable.
EEM 2.4 introduces the ability to replace multiple parameters in event registration statement lines with a
single environment variable.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
1769
Information About Writing Embedded Event Manager Policies Using Tcl