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19.13 Configuration of the common Spanning Tree functionality
19.13.1 List of configuration commands
The following table describes the commands used to configure common Spanning Tree
functionality.
Table 19-23 List of configuration commands
Command name
spanning-tree bpdufilter
spanning-tree guard
spanning-tree link-type
spanning-tree loopguard default
spanning-tree portfast
spanning-tree bpduguard
spanning-tree portfast bpduguard
default
spanning-tree portfast default
19.13.2 Setting PortFast
(1) Setting PortFast
PortFast can be applied to allow immediate communication for ports known in advance not
to have loops occur, such as ports connecting terminals.
Points to note
When the
PortFast functionality is applied by default on access ports, protocol ports, and MAC
ports. To disable PortFast for a port after it has been applied by default, use the
spanning-tree portfast disable
For trunk ports, this can be applied by specification for each port.
Command examples
1.
(config)# spanning-tree portfast default
Sets that PortFast functionality is to be applied by default for all access ports,
protocol ports, and MAC ports.
2.
(config)# interface fastethernet 0/1
(config-if)# switchport mode access
(config-if)# spanning-tree portfast disable
(config-if)# exit
Sets that PortFast functionality is not to be used on port 0/1 (access port).
Description
Sets BPDU filter functionality for each port.
Sets loop guard functionality and root guard functionality for
each port.
Sets link types for ports.
Sets loop guard functionality to be used by default.
Sets PortFast functionality for each port.
Sets BPDU guard functionality for each port.
Sets BPDU guard functionality to be used by default.
Sets PortFast functionality to be used by default.
spanning-tree portfast default
19 Spanning Tree Protocol
configuration command is executed,
configuration command.
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