SmartFabric OS10 Spanning tree protocol with VLT

Summary: Even though the VLT enabled topology provides a loop-free environment in the VLT domain, some non-VLT member ports can end up in a loop scenario. Rapid spanning tree protocol (RSTP) and rapid per-VLAN spanning tree+ (RPVST+) modes of spanning tree protocol in VLT are supported to provide a solution for this scenario. Depending on the network topology, the primary node of the VLT domain can be designated as the root bridge. ...

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Even though the VLT enabled topology provides a loop-free environment in the VLT domain, some non-VLT member ports can end up in a loop scenario. Rapid spanning tree protocol (RSTP) and rapid per-VLAN spanning tree+ (RPVST+) modes of spanning tree protocol in VLT are supported to provide a solution for this scenario. Depending on the network topology, the primary node of the VLT domain can be designated as the root bridge.

Note: Dell Technologies recommends that you enable a spanning tree (RSTP or RPVST+) before enabling VLT to avoid unintentional loops in the network.

The RPVST+ is enabled by default in Dell SmartFabric OS10. There is no need to configure RPVST+ unless the default spanning tree mode is changed.

VLT-Peer1(config)# spanning-tree mode rapid-pvst

  
The RSTP is enabled by using the following command.

  

  
VLT-Peer1(config)# spanning-tree mode rstp

  

  
For Multiple Spanning Tree Protocol (MSTP) on VLT nodes, configure both VLT peer nodes in the same MST region to avoid network loops. Ensure that the VLAN-to-instance mappings, region name, and revision ID are the same on both VLT peer nodes.

  

  
VLT-Peer1(config)# spanning-tree mode mst
VLT-Peer1(config)# spanning-tree mst configuration
VLT-Peer1(conf-mst)# instance 1 vlan 2-10
VLT-Peer1(conf-mst)# revision 10
VLT-Peer1(conf-mst)# name ExampleMSTregion

  

        


        

        
        
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Article Number: 000317735

                

                
                

                        
Article Type: How To

                

                

                        
Ultima modificare: 13 Jan 2026


                

                    

                            
Version:  2

                    


            


        

    

    

        

            

                
                    
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