Glossary

This command is supported in all STP modes such as STP, RSTP, MSTP, and PVST.
The command behavior does not change when a new member port is added to the port-channel or an
existing member port is deleted from the configuration. The path cost reflects the cumulative speed of
the port-channel member ports.
Example
DELLEMC(conf)#protocol spanning-tree pvst
DELLEMC(conf-pvst)#port-channel path-cost custom
protocol spanning-tree mstp
To enable and configure the multiple spanning tree group, enter MULTIPLE SPANNING TREE mode.
Syntax
protocol spanning-tree mstp
To disable the multiple spanning tree group, use the no protocol spanning-tree mstp command.
Defaults Not configured.
Command Modes CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100–ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.1 Introduced on the E-Series.
Usage
Information
MSTP is not enabled when you enter MULTIPLE SPANNING TREE mode. To enable MSTP globally on the
switch, enter the no disable command while in MULTIPLE SPANNING TREE mode.
For more information about the multiple spanning tree protocol, refer to the Dell EMC Networking OS
Configuration Guide.
Example
DellEMC(conf)# protocol spanning-tree mstp
DellEMC(config-mstp)#no disable
Related
Commands
● disable — disable multiple spanning tree.
Multiple Spanning Tree Protocol (MSTP) 1043