Concept Guide

• Adding and Removing Interfaces
• Creating Multiple Spanning Tree Instances
• Inuencing MSTP Root Selection
• Interoperate with Non-Dell Bridges
• Changing the Region Name or Revision
• Modifying Global Parameters
• Modifying the Interface Parameters
• Conguring an EdgePort
• Flush MAC Addresses after a Topology Change
• MSTP Sample Congurations
• Debugging and Verifying MSTP Congurations
Spanning Tree Variations
The Dell EMC Networking OS supports four variations of spanning tree, as shown in the following table.
Table 44. Spanning Tree Variations
Dell EMC Networking Term IEEE Specication
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 congure 64 MSTIs including the default instance 0 (CIST).
Congure Multiple Spanning Tree Protocol
Conguring multiple spanning tree is a four-step process.
1 Congure 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.
Multiple Spanning Tree Protocol (MSTP)
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