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6
6-19
GFK-1004B
Chapter 6 Troubleshooting
Table 6-10. Exception Log Event Codes - Continued
Log Event
Code Possible Cause and Resolution
Event “c”
LLC events
(Continued)
10a “LAN Severe Network Problem; Attempting Recovery”:
Repeated collisions caused the transmitter to fail 16 attempts to send a
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 “LAN Severe Network Problem; Attempting Recovery”:
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
incrementing every 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 extremely heavy
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.
10e “LAN Controller Underrun/Overrun; Resuming”:
During receiving, the MAC was unable to write data into memory quickly
enough. This indicates a LAN Controller design flaw; it should not occur.
The frame being received is discarded. Online operation continues.
10f “Network Traffic Prevented Tx; Discarded Request”:
Excessive backlog of transmission requests due to excessive traffic on the
network. For a sustained period, the MAC was unable to send frames as
quickly as requested.
110“Bad Local Application Request; Discarded Request”:
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 46-1500 bytes of LLC data.
111“LAN Severe Network Problem; Attempting Recovery ”:
A frame was received in which the Source Address was the same as this
station’s MAC 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.