Enable Multiple Spanning Tree Globally; Adding And Removing Interfaces; Creating Multiple Spanning Tree Instances - Dell Z9500 Configuration Manual

• 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
• Enabling SNMP Traps for Root Elections and Topology Changes
•

Enable Multiple Spanning Tree Globally

MSTP is not enabled by default. To enable MSTP globally, use the following commands.
When you enable MSTP, all physical, VLAN, and port-channel interfaces that are enabled and in Layer 2 mode are automatically
part of the MSTI 0.
• Within an MSTI, only one path from any bridge to any other bridge is enabled.
• Bridges block a redundant path by disabling one of the link ports.
1 Enter PROTOCOL MSTP mode.
CONFIGURATION mode
protocol spanning-tree mstp
2 Enable MSTP.
PROTOCOL MSTP mode
no disable
Example of Verifying MSTP is Enabled
To verify that MSTP is enabled, use the show config command in PROTOCOL MSTP mode.
Dell(conf)#protocol spanning-tree mstp
Dell(config-mstp)#show config
!
protocol spanning-tree mstp
no disable
Dell#

Adding and Removing Interfaces

To add and remove interfaces, use the following commands.
To add an interface to the MSTP topology, configure it for Layer 2 and add it to a VLAN.
If you previously disabled MSTP on the interface using the no spanning-tree 0 command, to enable MSTP, use the
following command.
•
spanning-tree 0
To remove an interface from the MSTP topology, use the no spanning-tree 0 command.

Creating Multiple Spanning Tree Instances

To create multiple spanning tree instances, use the following command.
A single MSTI provides no more benefit than RSTP. To take full advantage of MSTP, create multiple MSTIs and map VLANs to
them.
• Create an MSTI.
Multiple Spanning Tree Protocol (MSTP) 556