580 | Spanning Tree Protocol (STP)
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To verify that an interface is in Layer 2 mode and enabled, use the show config command from
INTERFACE mode (Figure 33-2).
Figure 33-2. show config Command Example
Enabling Spanning Tree Protocol Globally
You must enable STP globally; it is not enabled by default.
To enable STP globally for all Layer 2 interfaces, follow these steps:
To verify that STP is enabled, use the
show config command from PROTOCOL SPANNING TREE mode
(Figure 33-3).
Figure 33-3. Verifying STP is Enabled
When you enable STP, all physical, VLAN, and port-channel interfaces that are enabled and in Layer 2
mode are automatically part of the STP topology (Figure 33-4).
• Only one path from any bridge to any other bridge participating in STP is enabled.
• Bridges block a redundant path by disabling one of the link ports.
Step Task Command Syntax Command Mode
1 Enter PROTOCOL SPANNING TREE mode.
protocol spanning-tree 0
CONFIGURATION
2 Enable Spanning Tree.
no disable
PROTOCOL
SPANNING TREE
Note: To disable STP globally for all Layer 2 interfaces, use the disable command from PROTOCOL
SPANNING TREE mode.
FTOS(conf-if-te-1/1)#show config
!
interface TenGigabitEthernet 1/1
no ip address
switchport
no shutdown
FTOS(conf-if-te-1/1)#
Indicates that the interface is in Layer 2 mode
FTOS(conf)#protocol spanning-tree 0
FTOS(conf-span)#show config
!
protocol spanning-tree 0
no disable
FTOS#
Indicates that Spanning Tree is enabled
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