User`s guide

System Commands
7-12 Using the Administrative Interface
firmware download software on the serial port. If, after 5 seconds, no download
request is detected, the bootloader will run the self-test out of ROM space. The self-
test then runs in 10-Mbit loopback mode and performs these three tests:
1)
Loopback test.
This tests the basic send/receive functionality of each port with
varying frame sizes.
2)
Broadcast test.
This tests the basic forwarding capabilities of the bus by sending
broadcast frames from each port with varying frame sizes.
3)
Bus B test.
This tests the secondary bus.
If the self-test succeeds, the SNMP software is copied from the Flash into main
memory and is executed. If any part of the test fails, the systems halts.
In short mode, the switch wakes up after 30 to 40 seconds (depending on the number
of ports installed).
If the test level is none, no self-test is performed and the SNMP software is loaded
immediately after the download timeout expires.
If the test level is long, a RAM check is run on reset, and the self-test performs many
other tests. In this mode, the switch wakes up after about 2 minutes.
NOTE
The switch should be disconnected from the network while the long test is
executing.
If the test level is diagnostics, the self-test runs in interactive mode. INTERACTIVE
SELF-TEST SHOULD BE USED ONLY BY A QUALIFIED SWITCH ENGINEER.
Typing "quit" at the debugger prompt exits the tester and resumes the boot sequence.
The interactive mode can also be entered by typing three escapes (<Esc> <Esc>
<Esc>) in quick succession after the # character appears.
If, during boot, the boot ROM determines that the flash checksum is bad, it does NOT
time out during the download sequence. Instead, it waits there until a valid download
request is received on the console. As before, press the escape key quickly three times
to bring up the interactive self-test.
During the self-tests, you can skip individual tests by pressing any key during the test.