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Dell EMC SmartFabric OS10 User Guide Release 10.5.0

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Supported STP modes

The following variants of spanning-tree protocols are used in OS10 to provide a loop free layer 2 topology:
  • Rapid Spanning Tree protocol can be seen as an evolution of the 802.1D standard. Primarily RSTP is created to address the slow convergence nature of STP protocol (802.1D).
  • Multiple Spanning Tree protocol (MSTP) defined in IEEE standard (802.1s), is an evolution of spanning tree protocols allowing creation of multiple instance of spanning tree and mapping multiple VLANs to a specific spanning tree instance.
  • Rapid per-VLAN spanning-tree protocol (Rapid-PVST) is a variant of RSTP protocol and supports creation of per VLAN spanning tree instance to isolate link fluctuations only to a particular VLAN segment and also helps in load balancing across different links.
  • 802.1D STP Compatibility mode support. This mode enables the bridge to function as an IEEE Std 802.1D legacy STP compatible mode while the system is running RSTP or MSTP modes of the spanning tree protocol.
  • RSTP and MSTP are backward compatible with STP 802.1D. When an interface receives STP BPDU, the system responds with the STP version of BPDU.

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