Administering FDDI MACs

8-15

LLC service is disabled.

This is an NSA Frame and the A-bit is set.

Figure 8-1 shows the order in which these discard tests are made.

 

. . .from FDDI

Receive Frame. . .

Network

rxFrames

noRxBuffers

errorCount rxInternalErrs

rxDiscards

rxUcastFram es

Frames received from the

Frames discarded because buffer space

Frames discarded because frame

Frames discarded because LLC Service disabled or NSA frame with A-

=Frames delivered by this FDDI

processing of

Figure 8-1 How Frame Processing Affects FDDI MAC Receive Frame Statistics

Frames are delivered to an FDDI MAC by bridges and management applications. However, a frame might be discarded for the following reasons:

LLC Service is disabled.

The FDDI ring is not operational.

There is no room on the transmit queue.

An error has occurred during frame transmission.

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3Com 2200 manual Receive Frame Network