Cabletron Systems ZX-250 사용자 설명서

SmartCell ZX-250 User Guide   4-23

Switch Administration

Upgrading and Changing Software  

Along with EFCI and backward RM cell marking, the SmartCell ZX-250 uses standard RM cell marking. The switch 
discard threshold (

) corresponds to total shared buffer utilization and represents the 

point at which the switch considers itself congested and starts marking RM cells.

2p›F

The switch discard threshold is not user configurable and is shown only for 
information.

For information on troubleshooting congestion problems, see Chapter 5, “Troubleshooting.”

4.7

UPGRADING AND CHANGING SOFTWARE

This section describes the low-level boot load commands. Boot load commands are used for setting switch start-up 
behavior and for performing firmware downloads. Use the boot load commands to:

U

Set which copy of the boot load firmware is the default copy

U

Clear all configurations stored within the flash file system

U

Check boot load firmware version numbers

U

Load switch firmware upgrades

U

Set whether power-on system tests (POST) are automatically run at start-up

4.7.1

Accessing the Boot Load Prompt

Boot load commands are executed from the boot load prompt. The boot load prompt is not part of the switch console, 
and is accessible only after a reboot and before the switch software is loaded. Consequently, the boot load commands 
can be used only through a terminal connection. 

Perform the following steps to gain access to the boot load prompt:

s•

Connect a dumb terminal (or PC running terminal emulation software) to the RJ-45 terminal port on 
the front of the SmartCell ZX-250.

¢•

Enter the 

 command from the terminal.

••

Wait for the following message to appear:

“Press any key to exit to boot load prompt.”

T•

Before the countdown reaches zero, press a key to access the boot load prompt. Notice that the boot 
load prompt (=>) differs from the prompt used by the switch console.