Which technology provides a layer 2 loop free and does not contain a port state named "Blocking"?

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1. PVST+ is based on IEEE802.1D Spanning Tree Protocol (STP). But PVST+ has only 3 port states (discarding, learning and forwarding) while STP has 5 port states (blocking, listening, learning, forwarding and disabled). So discarding is a new port state in PVST+.

   Each LAN port on a software using Rapid PVST+ or MST exists in one of the following four states:

   Blocking—The LAN port does not participate in frame forwarding.
   Learning—The LAN port prepares to participate in frame forwarding.
   Forwarding—The LAN port forwards frames.
   Disabled—The LAN port does not participate in STP and is not forwarding frames.

   https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guide/cli/CLIConfigurationGuide/RPVSpanningTree.html#72779

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