IBM 8270, Инструкция по установке и обслуживанию

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loops. Temporarily disconnect the parallel ports, and then use the
Spanning Tree panels to reestablish port costs and priorities. If you are
using an SNMP manager, reconfigure all IP and SNMP parameters. If in
doubt, disconnect all ports then reconnect them one at a time.
If the problem is corrected, resume using the 8270.
Step 3. One or more bad ports can cause this symptom, and the remaining ports
might continue to operate.
a. Reset the 8270 and monitor the diagnostic messages for port failures.
Try to correct any individual port problems that are detected.
b. For failing UFC ports, use the UFC documentation to try to correct the
problem.
c. If the problem is corrected, resume using the 8270.
Step 4. If the problem is not corrected, the 8270 is defective. See “Obtaining
Service” on page 5-6.
Procedure C
Use this procedure if all devices connected to the 8270 are having communication
problems, the Fault (unlabeled) LED is off, and the OK LED is on:
Step 1. Reset the 8270 by disconnecting the line cord from the ac outlet, waiting
10 seconds, and reconnecting the line cord to the ac outlet.
a. If the problem goes away, resume using the 8270.
b. If the status LEDs indicate a failure, go to “Procedure B” on page 5-3.
c. If the problem persists, check all the configuration parameters.
d. If the problem has still not been resolved, go to “Procedure D” and try
to get individual ports working.
Procedure D
Use this procedure if one device connected to the 8270 is having a communication
problem, the Fault (unlabeled) LED is off, the OK LED is on and other attached
devices can communicate through the 8270:
Step 1. Check the port (UFC) LEDs.
a. If the Connect LED is on, the problem is probably external to the
8270-800. Go to step 2.
b. If the Connect LED is off, the port is probably disabled. Check that
the port configuration matches that of the attached device, and then
go to step 3.
c. If the Connect LED is blinking, go to step 4.
Step 2. If the Connect LED on the failing port is on, and the attached device still
cannot communicate:
a. If the attached device is directly connected, it might be set up
incorrectly. Go to step 4.
b. In a shared environment, check the segment cabling and the media
access unit.
c. Go to step 5.
5-4
8270 Nways LAN Switch Models 600 and 800