Spanning Tree VariationsThe Dell Networking OS supports four variations of spanning tree, as shown in the following table.Table 33. Spanning Tree VariationsDell Networking Term IEEE SpecificationSpanning Tree Protocol (STP) 802 .1dRapid Spanning Tree Protocol (RSTP) 802 .1wMultiple Spanning Tree Protocol (MSTP) 802 .1sPer-VLAN Spanning Tree Plus (PVST+) Third PartyImplementation InformationThe following describes the MSTP implementation information.• The Dell Networking OS MSTP implementation is based on IEEE 802.1Q-2003 and interoperates only with bridges that also usethis standard implementation.• MSTP is compatible with STP and RSTP.• Dell Networking OS supports only one MSTP region.• When you enable MSTP, all ports in Layer 2 mode participate in MSTP.Configure Multiple Spanning Tree ProtocolConfiguring multiple spanning tree is a four-step process.1. Configure interfaces for Layer 2.2. Place the interfaces in VLANs.3. Enable the multiple spanning tree protocol.4. Create multiple spanning tree instances and map VLANs to them.Related Configuration TasksThe following are the related configuration tasks for MSTP.• Creating Multiple Spanning Tree Instances• Adding and Removing Interfaces• Influencing MSTP Root Selection• Interoperate with Non-Dell Networking OS Bridges• Changing the Region Name or Revision• Modifying Global Parameters• Modifying the Interface Parameters• Configuring an EdgePort• Flush MAC Addresses after a Topology Change• Debugging and Verifying MSTP Configurations• Prevent Network Disruptions with BPDU Guard• Enabling SNMP Traps for Root Elections and Topology Changes•Configuring Spanning Trees as HitlessMultiple Spanning Tree Protocol (MSTP) 453
