White Papers
• Enable Multiple Spanning Tree Globally
• Adding and Removing Interfaces
• Creating Multiple Spanning Tree Instances
• Inuencing MSTP Root Selection
• Interoperate with Non-Dell Bridges
• Changing the Region Name or Revision
• Modifying Global Parameters
• Modifying the Interface Parameters
• Conguring an EdgePort
• Flush MAC Addresses after a Topology Change
• MSTP Sample Congurations
• Debugging and Verifying MSTP Congurations
Spanning Tree Variations
The Dell EMC Networking OS supports four variations of spanning tree, as shown in the following table.
Table 45. Spanning Tree Variations
Dell EMC Networking Term IEEE Specication
Spanning Tree Protocol (STP) 802 .1d
Rapid Spanning Tree Protocol (RSTP) 802 .1w
Multiple Spanning Tree Protocol (MSTP) 802 .1s
Per-VLAN Spanning Tree Plus (PVST+) Third Party
Implementation Information
MSTP is implemented as follows in Dell EMC Networking OS:
• The Dell EMC Networking OS MSTP implementation is based on IEEE 802.1Q-2003 and interoperates only with bridges that also use
this standard implementation.
• MSTP is compatible with STP and RSTP.
• Dell EMC Networking OS supports only one MSTP region.
• When you enable MSTP, all ports in Layer 2 mode participate in MSTP.
• You can congure 64 MSTIs including the default instance 0 (CIST).
Congure Multiple Spanning Tree Protocol
Conguring multiple spanning tree is a four-step process.
1 Congure 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.
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Multiple Spanning Tree Protocol (MSTP)