Specifications

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Cisco Wide Area Application Services Command Reference

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Chapter 3 CLI Commands

(config) kernel

To enable access to the kernel debugger (kdb), use the kernel kdb global configuration command. Once

enabled, kdb is automatically activated if kernel problems occur, or you can manually activate it from

the local console for the WAAS device by pressing the required key sequence. To disable access to the

kernel debugger, use the no form of the command.

kernel kdb

Syntax Description This command has no arguments or keywords.

Defaults The kernel debugger is disabled by default.

Command Modes global configuration

Device Modes application-accelerator

central-manager

Usage Guidelines Once enabled, kdb is automatically activated when kernel problems occur. Once activated, all normal

functioning of the WAAS device is suspended until kdb is manually deactivated. The kdb prompt looks

like this:

[0]kdb>

To deactivate kdb, enter go at the kdb prompt. If kdb was automatically activated because of kernel

problems, the system generates a core dump and restarts. If you activated kdb manually for diagnostic

purposes, the system resumes normal functioning in whatever state it was when you activated kdb. In

either case, if you enter reboot, the system restarts and normal operation resumes.

kdb is disabled by default and you must enter the kernel kdb command in global configuration mode to

enable it. If kdb has been previously enabled, you can enter the no kernel kdb global configuration

command to disable it. When kdb is enabled, you can activate it manually from the local console by

pressing Ctrl-_ followed by Ctrl-B.

The rationale for disabling the kernel debugger is as follows: the WAAS device is often unattended at

many sites, and it is desirable for the WAAS device to automatically reboot after generating a core dump

instead of requiring user intervention. Disabling the kernel debugger allows automatic recovery.

Examples The following example enables, and then disables, access to the kernel debugger:

WAE(config)# kernel kdb

WAE(config)# no kernel kdb