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It should be noted: A port must continue to receive BPDUs
advertising superior paths to remain in the blocking state.
There are a number of circumstances in which the STA can
fail – mostly related to the loss of a large number of BPDUs.
These situations will cause a port in the blocking state to
transition to the forwarding state.
Full/Half Duplex Mismatch
A mismatch in the duplex state of two ports is a very
common configuration error for a point-to-point link. If one
port is configured as a full duplex, and the other port is left in
auto-negotiation mode, the second port will end up in half-
duplex because ports configured as half- or full-duplex do
not negotiate.
In the above example, port 1 on B is configured as a full-
duplex port and port 1 on A is either configured as a half-
duplex port, or left in auto-negotiation mode. Because port 1
on B is configured as a full-duplex port, it does not do the
carrier sense when accessing the link. B will then start
180 VH-2402-L3 Management Guide
Figure A-2. Full- Half-Duplex Mismatch
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