Password Recovery Procedure

for LANE/MPOA Modules
Description

This document describes the password recovery procedure for the following Local Area Network Emulation (LANE) and Multiprotocol over Asynchronous Transfer Mode (MPOA) modules:

WS-X5161
WS-X5162
WS-X5165
WS-X5167
WS-X5168

Note: Before you can use this method to erase the Nonvolatile Random Access Memory (NVRAM) configuration, you must have a separate console connected to the LANE/MPOA board. Carrying out this password recovery procedure via a session on supervisor will not work since it produces displays only after Cisco IOS^® Software comes up (whereas you need to access in the programmable read-only memory (ROM) at boot time itself).

Step-by-Step Procedure

Issue the resetcommand from supervisor for the LANE/MPOA board. A programmable ROM boot message appears on the console.
When you see the following line, hit the ESC key:
```
Hit ESC key within 3 seconds to enter SOFT-JUMPER config menu. 
```
This displays the Soft Jumper Configuration menu, which displays or modifies the soft jumpers of the board. The IOS software uses these jumpers to determine the mode and other debug functionalities.
Choose option 2, the Modify Jumper Configuration menu item. You do not need to press Enter when selecting from this menu.
This option displays information for every jumper and asks if you want to change the jumper configuration.

Answer n to all questions until you see the following line :

DMON jumper .................Disabled. Want to change (y/n/q/e/d)?

Type e to enable debug monitor mode.
You can now see that the debug monitor jumper is ENABLED.
Quit the menu by typing q.
The programmable ROM boot continues with the startup.
Reset the LANE/MPOA board again from the supervisor. The LANE/MPOA console shows that the programmable read-only memory goes into debug monitor mode, displaying DMON> as a prompt.
Enter the debug monitor mwl command (multiple write of long words). You do not need to press Enter.
The monitor asks for the start address, count and data. Enter the following data (again, you do not need to press Enter):
```
DMON:> mwl Start Addr? 20000000  Count? 0006ffff  Data? ffffffff
```
This erases the NVRAM configurations.

Note: The count value should not exceed 6ffff. If you type in the wrong value, you can quit this mwl command at any moment by typing q. Please also note that the Backspace key does not work on this monitor.
Type q or f to debug the monitor. This takes you through the usual boot programmable read-only memory path.
When you see the following message, quickly hit the ESC key:
```
Hit ESC key within 3 seconds to enter SOFT-JUMPER config menu. 
```
This displays the Soft Jumper Configuration menu.
Choose option 2 to disable the debug monitor jumper.
As in step 4 above, keep entering n until you see the debug monitor jumper information line.
Type d to disable the jumper.
Type q to quit the menu. The LANE/MPOA board boots to the Cisco IOS prompt as usual but it does not have a configuration in NVRAM. You can now reconfigure it as needed
说明：

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