Reference Guide

618 | Multiple Spanning Tree Protocol
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FTOS supports three other variations of Spanning Tree, as shown in Table 44.
Implementation Information
• The FTOS 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.
• FTOS supports only one MSTP region.
• When you enable MSTP, all ports in Layer 2 mode participate in MSTP.
• On the C-Series and S-Series, you can configure 64 MSTIs including the default instance 0 (CIST).
Configure Multiple Spanning Tree Protocol
Configuring Multiple Spanning Tree is a four-step process:
1. Configure interfaces for Layer 2. Refer to Configuring Interfaces for Layer 2 Mode.
2. Place the interfaces in VLANs.
3. Enable Multiple Spanning Tree Globally.
4. Create Multiple Spanning Tree Instances.
Related Configuration Tasks
• Create Multiple Spanning Tree Instances
• Add and Remove Interfaces
• Influence MSTP Root Selection
• Interoperate with Non-FTOS Bridges
• Modify Global Parameters
• Modify Interface Parameters
• Configure an EdgePort
• Flush MAC Addresses after a Topology Change
• Debugging and Verifying MSTP Configuration
• Preventing Network Disruptions with BPDU Guard
• SNMP Traps for Root Elections and Topology Changes
• Configuring Spanning Trees as Hitless
Table 32-1. FTOS Supported Spanning Tree Protocols
Dell Force10 Term IEEE Specification
Spanning Tree Protocol 802.1d
Rapid Spanning Tree Protocol 802.1w
Multiple Spanning Tree Protocol 802.1s
Per-VLAN Spanning Tree Plus Third Party