Administrator Guide

• Enable Multiple Spanning Tree Globally
• 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 Networking OS supports four variations of spanning tree, as shown in the following table.
Table 42. Spanning Tree Variations
Dell 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 Networking OS:
• The Dell 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 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.
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Multiple Spanning Tree Protocol (MSTP)