Dell Force10 MXL Blade - Create Multiple Spanning Tree Instances; Enable Multiple Spanning Tree Globally

Multiple Spanning Tree Protocol (MSTP) | 339
• Preventing Network Disruptions with BPDU Guard
• SNMP Traps for Root Elections and Topology Changes
Enable Multiple Spanning Tree Globally
MSTP is not enabled by default. To enable MSTP, follow these steps:
To verify that MSTP is enabled, use the
show config command from PROTOCOL MSTP mode
(Figure 19-2).
Figure 19-2. Verifying MSTP is Enabled
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.
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.
To create an MSTI, use the
msti command from PROTOCOL MSTP mode. Specify the keyword vlan
followed by the VLANs that you want to participate in the MSTI (Figure 19-3).
Step Task Command Syntax Command Mode
1 Enter PROTOCOL MSTP mode.
protocol spanning-tree mstp
CONFIGURATION
2 Enable MSTP.
no disable
PROTOCOL MSTP
FTOS(conf)#protocol spanning-tree mstp
FTOS(conf-mstp)#no disable
FTOS(conf-mstp)#show config
!
protocol spanning-tree mstp
no disable
FTOS#