6 |
Table 6-10. Exception Log Event Codes - Continued
Log Event |
|
Code | Possible Cause and Resolution |
Eventªcº | 10a ªLAN Severe Network Problem; AttemptingRecoveryº: |
LLC events | Repeated collisions caused the transmitter to fail 16 attempts to send a |
(Continued) | frame. If the LAN stays Offline, it is likely caused by a damaged or |
| unterminated trunk cable. (This report may occasionally be caused by |
| extremely heavy network traffic.) Online operation should resume within |
| 10 seconds after repair. |
| 10b ªLAN Severe Network Problem; AttemptingRecoveryº: |
| During attempted transmission, either some external condition prevented |
| transmission of a frame for at least one second (MacErr) or a late collision |
| occurred (LateColl). Use the TALLY L cmd to distinguish. If MacErr is |
| incrementingevery 10 seconds, the transceiver is likely hearing constant |
| carrier on the network. This can be caused by disconnection of the |
| transceiver from the network or by a faulty connection of the transceiver to |
| the network; it can also be caused by test equipment attached to the |
| network, or to a remote failed transceiver. Are other nodes reporting the |
| same fault? (MacErr may occasionally be caused by extremelyheavy |
| network traffic.) LateColl indicates a protocol violation by a remote |
| station; the tx frame may be lost. Online operation should resume within |
| 10 seconds after repair. |
| 10eªLANControllerUnderrun/Overun;Resumingº: |
| During receiving, the MAC was unable to write data into memoryquickly |
| enough. This indicates a LAN Controller design flaw; it should not occur. |
| The frame being received is discarded. Online operation continues. |
| 10f ªNetwork Traffic PreventedTx;DiscardedRequestº: |
| Excessive backlog of transmission requests due to excessive traffic on the |
| network. For a sustained period, the MAC was unable to send frames as |
| quicklyasrequested. |
110ªBad Local Application Request; Discarded Requestº:
The LLC rejected a local application request to send a frame because the frame length was invalid. IEEE 802.3 frames must not exceed 1497 bytes of LLC data. Ethernet frames must contain
111ªLAN Severe Network Problem; AttemptingRecovery º:
A frame was received in which the Source Address was the same as this station'sMAC Address. All stations on a network must have a unique MAC address. Immediately isolate the offending station; it may be necessary to turn it off or disconnect it from the network. This station remains Online unless you intervene to take it Offline.
Chapter 6 Troubleshooting |
