System Troubleshooting and Diagnostics
5.5 Using MOP Ethernet Functions to Isolate Failures
***system 1 (system under test)***
>>>SHOW ETHERNET
Ethernet Adapter
-EZA0 (08-00-2B-28-18-2C)
>>>BOOT EZA0
(BOOT/R5:2 EZA0)
2..
-EZA0
Retrying network bootstrap.
Unless the system is able to boot, the ‘‘Retrying network bootstrap’’ message
will display every 8–12 minutes.
Identify the system’s Ethernet circuit and circuit state, enter the SHOW
KNOWN CIRCUITS command from the system conducting the test (system 2).
***system 2 (system conducting test)***
$ MCR NCP
NCP>SHOW KNOWN CIRCUITS
Known Circuit Volatile Summary as of 14-NOV-1991 16:01:53
Circuit
State
Loopback
Adjacent
Name
Routing Node
ISA-0
on
25.1023 (LAR25)
NCP>SET CIRCUIT ISA-0 STATE OFF
NCP>SET CIRCUIT ISA-0 SERVICE ENABLED
NCP>SET CIRCUIT ISA-0 STATE ON
NCP>LOOP CIRCUIT ISA-0 PHYSICAL ADDRESS 08-00-2B-28-18-2C
WITH ZEROES
NCP>EXIT
$
If the loopback message was received successfully, the NCP prompt will
reappear with no messages.
The following two examples show how to perform the Loopback Assist Function
using another node on the network as an assistant (system 3) and the system
under test as the destination. Both assistant and system under test are
attempting to boot from the network. We will also need the physical address of
the assistant node.
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