Hi Marko
It depends of your STP topology, BLK is used to avoid layer 2 loops. Probably other path is better and your port is set up as BLK to avoid loops or there is already a loop and the topology was protected including the port in blocking state.
In a stable topology with consistent port roles throughout the network, the RSTP ensures that every root port and designated port immediately transition to the forwarding state while all alternate and backup ports are always in the discarding state (equivalent to blocking in IEEE 802.1D). The port state controls the operation of the forwarding and learning processes. Table 7-3 provides a comparison of IEEE 802.1D and RSTP port states.
Table 7-3 Port State Comparison
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Is Port Included in the
Active Topology?
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Enabled
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Blocking
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Discarding
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No
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Enabled
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Listening
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Discarding
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No
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Enabled
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Learning
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Learning
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Yes
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Enabled
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Forwarding
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Forwarding
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Yes
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Disabled
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Disabled
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Discarding
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No
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Regards.
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