Compaq ProLiant 1000 LAN Driver Statistics for Novell Drivers - Page 15

Abort Delimiter, Lost Frame Errors, Last Ring Status

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ECG043/1097 INTEGRATION NOTE (cont.) 1...5 Abort Delimiter This item increments when a station transmits an abort delimiter while transmitting. An aborted transmit occurs if the NIC is unable to complete the transmission of a frame that it has already started onto the network. For example, if the NIC was unable to access its packet buffer memory fast enough to keep pace with sending the data stream onto the wire, the NIC will abort the transmit. When a NIC aborts the transmit, it places a special bit sequence on the wire known as an abort delimiter, which signals to other stations on the Token Ring that the packet data is invalid. Many NICs do not support aborting transmits, preferring instead to shut down with a fatal error and remove the NIC from the ring. Those NICs that support aborting transmits will report this error. If this error is reported, run the diagnostics from the NIC manufacturer. Lost Frame Errors This error indicates that a sending station was unable to complete the transmission because the frame that was sent never returned to the originator. When a station sends a frame, that frame normally returns after completing the circuit. If the frame does not return intact, this error will increment. These errors may occur if another station asserts itself on a ring or de-asserts itself from the ring, interrupting the clock cycle. Large noise spikes, such as lightning, could also cause these errors. If you see excessive Lost Frame errors, there may be a problem with the Multi-Access Unit (MAU) or hub. Use a network analyzer to isolate the problem area. If other errors are occurring, they may help you pinpoint the most likely source of the problem: Line Errors and Lost Frame Errors: Check for bad cabling. Packet data traveling through shorted or damaged cabling may become corrupt before reaching the destination station, or may not return to the originator intact. Ensure that no large motors are causing noise on the cables. Burst Errors and Lost Frame Errors: Check to see if nodes are asserting onto or de-asserting off the ring. Excessive network traffic getting on and off the ring will cause a high number of lost frame errors. Run the diagnostics from the MAU connector manufacturer to see if there is a problem with the MAU. Lost Frame Errors only: Run the diagnostics from the MAU connector manufacturer to determine if a problem exists with the MAU. If the MAU is working correctly, large noise spikes may be the cause of the problem. Last Ring Status This item indicates the current interface status when the NIC is active on the ring. This field can be one of, or a sum of, the following values: 00000000h: OK. No problems have been detected. 00000020h: Ring Recovery. The active monitor changes from one station to another when the current active monitor de-asserts itself from the network, or has detected a problem with itself. Check other error counts to see if a problem exists. 00000040h: Single Station. This NIC has detected that it is the only NIC on the ring. This condition might be caused by the network administrator choosing to isolate the NIC, or from a Multi-Access Unit (MAU) or hub failure. Check your MAU or hub. Use the diagnostics from the MAU manufacturer to help you determine if a problem exists.

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I
NTEGRATION
N
OTE
(cont.)
15
ECG043/1097
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Abort Delimiter
This item increments when a station transmits an abort delimiter while transmitting.
An aborted transmit occurs if the NIC is unable to complete the transmission of a frame that it
has already started onto the network.
For example, if the NIC was unable to access its packet
buffer memory fast enough to keep pace with sending the data stream onto the wire, the NIC will
abort the transmit. When a NIC aborts the transmit, it places a special bit sequence on the wire
known as an abort delimiter, which signals to other stations on the Token Ring that the packet
data is invalid.
Many NICs do not support aborting transmits, preferring instead to shut down with a fatal error
and remove the NIC from the ring.
Those NICs that support aborting transmits will report this
error.
If this error is reported, run the diagnostics from the NIC manufacturer.
Lost Frame Errors
This error indicates that a sending station was unable to complete the transmission because the
frame that was sent never returned to the originator.
When a station sends a frame, that frame
normally returns after completing the circuit.
If the frame does not return intact, this error will
increment.
These errors may occur if another station asserts itself on a ring or de-asserts itself from the ring,
interrupting the clock cycle.
Large noise spikes, such as lightning, could also cause these errors.
If you see excessive Lost Frame errors, there may be a problem with the Multi-Access Unit
(MAU) or hub.
Use a network analyzer to isolate the problem area.
If other errors are occurring, they may help you pinpoint the most likely source of the problem:
Line Errors and Lost Frame Errors:
Check for bad cabling. Packet data traveling through shorted
or damaged cabling may become corrupt before reaching the destination station, or may not
return to the originator intact. Ensure that no large motors are causing noise on the cables.
Burst Errors and Lost Frame Errors:
Check to see if nodes are asserting onto or de-asserting off
the ring.
Excessive network traffic getting on and off the ring will cause a high number of lost
frame errors.
Run the diagnostics from the MAU connector manufacturer to see if there is a
problem with the MAU.
Lost Frame Errors only: Run the diagnostics from the MAU connector manufacturer to determine
if a problem exists with the MAU.
If the MAU is working correctly, large noise spikes may be
the cause of the problem.
Last Ring Status
This item indicates the current interface status when the NIC is active on the ring.
This field can
be one of, or a sum of, the following values:
00000000h:
OK.
No problems have been detected.
00000020h:
Ring Recovery.
The active monitor changes from one station to another when the
current active monitor de-asserts itself from the network, or has detected a problem with itself.
Check other error counts to see if a problem exists.
00000040h:
Single Station.
This NIC has detected that it is the only NIC on the ring.
This
condition might be caused by the network administrator choosing to isolate the NIC, or from a
Multi-Access Unit (MAU) or hub failure. Check your MAU or hub.
Use the diagnostics from the
MAU manufacturer to help you determine if a problem exists.