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8-16 CHAPTER 8: ADMINISTERING FDDI RESOURCES
Figure 8-2 shows the order in which the discard tests are made.
Figure 8-2 How Frame Processing Affects FDDI MAC Transmit Frame Statistics
Setting the Frame
Error Threshold
The FrameErrorThreshold attribute determines when a MAC condition report
is generated because too many frame errors have occurred. A frame error
occurs when a frame becomes corrupted. A high error rate often indicates a
faulty station on the FDDI ring or a dirty FDDI connector.
Station Management (SMT) monitors the ratio of frame errors to all frames
transmitted within a certain period of time. The FrameErrorThreshold
determines at what percentage the frame errors are significant enough to
report to network management. The threshold value is expressed in a
percentage based on 65536 (or 100%). For example, to set the threshold at
1%, the value is 655 (the system default). The lower you set the percentage,
the more likely SMT will report a problem.
To set the FrameErrorThreshold:
1 From the top level of the Administration Console, enter:
fddi mac frameErrorThreshold
You are prompted for a MAC number and new value. The Switch 2200 has
one MAC, which appears in brackets.
2 Press [Return].
3 Enter the new threshold value.
txUcastFrame
s
txMcastFram
es
txDiscards
txQOverflows
txInternalErrs
txFrames
Frames delivered to this MAC
Frames discarded because LLC
Service disabled or ring not
Frames discarded because
transmit queue full
Frames successfully transmitted
to the network
processing of
Transmit Frame Statistics. . .
. . .to FDDI
Network
=
Frames discarded because of
error during transmission
Top-Level Menu
system
ethernet
➧fddi
bridge
ip
snmp
analyzer
script
logout
station
path
➧mac
port
summary
detail
➧frameErrorThreshold
notCopiedThreshold
llcService
path