Enable Multiple Spanning Tree Globally; Adding And Removing Interfaces - Dell S4820T Configuration Manual

• 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
•
Configuring Spanning Trees as Hitless

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.
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Multiple Spanning Tree Protocol (MSTP)