Enable Multiple Spanning Tree Globally; Add And Remove Interfaces; Create Multiple Spanning Tree Instances - Dell Force10 Z9000 Configuration Manual

• Preventing Network Disruptions with BPDU Guard on page 883
• SNMP Traps for Root Elections and Topology Changes on page 779
• Configuring Spanning Trees as Hitless on page 886

Enable Multiple Spanning Tree Globally

MSTP is not enabled by default. To enable MSTP:
Step Task
1 Enter PROTOCOL MSTP mode.
2 Enable MSTP.
Verify that MSTP is enabled using the
Figure 27-2.
Figure 27-2. Verifying MSTP is Enabled
FTOS(conf)#protocol spanning-tree mstp
FTOS(config-mstp)#show config
!
protocol spanning-tree mstp
no disable
FTOS#
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.

Add and Remove Interfaces

• 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 command
the command
• Remove an interface from the MSTP topology using the command
also Removing an Interface from the Spanning Tree Group on page 880

Create Multiple Spanning Tree Instances

A single MSTI provides no more benefit than RSTP. To take full advantage of MSTP you must create
multiple MSTIs and map VLANs to them.
Command Syntax
protocol spanning-tree mstp
no disable
show config
spanning-tree 0
.
command from PROTOCOL MSTP mode, as shown in
no spanning-tree 0
no spanning-tree 0
Multiple Spanning Tree Protocol (MSTP) | 593
Command Mode
CONFIGURATION
PROTOCOL MSTP
, re-enable it using
command. See
for Filtering behavior.