1018 | Spanning Tree Protocol (STP)
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As shown in STP topology 3 (Figure 49-8 bottom middle), after you enable loop guard on an STP port or
port-channel on Switch C, if no BPDUs are received and the
max-age timer expires, the port transitions
from a blocked state to a loop-inconsistent state (instead of to a forwarding state). Loop guard blocks the
STP port so that no traffic is transmitted and no loop is created.
As soon as a BPDU is received on an STP port in a loop-inconsistent state, the port returns to a blocking
state. If you disable STP loop guard on a port in a loop-inconsistent state, the port transitions to an STP
blocking state and restarts the
max-age timer.
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