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Spanning Tree Variations
The Dell Networking OS supports four variations of spanning tree, as shown in the following table.
Table 44. Spanning Tree Variations
Dell Networking Term IEEE Specification
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 on the Dell Networking OS:
• The 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.
• The system supports only one MSTP region.
• When you enable MSTP, all ports in Layer 2 mode participate in MSTP.
Configure Multiple Spanning Tree Protocol
Configuring 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 Tasks
The 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
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Multiple Spanning Tree Protocol (MSTP)