Enable Multiple Spanning Tree Globally; Add And Remove Interfaces; Create Multiple Spanning Tree Instances - Dell Force10 C150 Configuration Manual

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 29-2.
Figure 29-2. 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 1054

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.
Create an MSTI using the command
followed by the VLANs that you want to participate in the MSTI, as shown in
Command Syntax
protocol spanning-tree mstp
no disable
show config
spanning-tree 0
.
msti
from PROTOCOL MSTP mode. Specify the keyword
command from PROTOCOL MSTP mode, as shown in
no spanning-tree 0
no spanning-tree 0
Command Mode
CONFIGURATION
PROTOCOL MSTP
, re-enable it using
command. See
for BPDU Filtering behavior.
vlan
Figure 29-3.
Multiple Spanning Tree Protocol | 645