DIS-200G Series Gigabit Ethernet Switch CLI Reference Guide
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33-6
spanning-tree portfast
This command is used to specify the port’s fast mode. Use the
no
form of this command to revert to the default
setting.
spanning-tree portfast {disable | edge| network}
no spanning-tree portfast
Parameters
disable
Specifies to set the port to the port fast disabled mode.
edge
Specifies to set the port to the port fast edge mode.
network
Specifies to set the port to the port fast network mode.
Default
By default, this option is edge.
Command Mode
Interface Configuration Mode.
Command Default Level
Level: 15.
Usage Guideline
A port can be in one of the following three port fast modes:
Edge mode -
The port will directly change to the spanning-tree forwarding state when a link-up occurs
without waiting for the forward-time delay. If the interface receives a BPDU later, its operation state
changes to the non-port-fast state.
Disable mode -
The port will always be in the non-port-fast state. It will always wait for the forward-time
delay to change to forwarding state.
Network mode -
The port will remain in the non-port-fast state for three seconds. The port will change
to the port-fast state if no BPDU is received and changes to the forwarding state. If the port received the
BPDU later, it will change to the non-port-fast state
This command should be used with caution. Otherwise, an accidental topology loop and data-packet loop may
be generated and disrupt the network operation.
Example
This example shows how to configure port Ethernet 1/0/1 to the port-fast network mode.
Switch# configure terminal
Switch(config)# interface Ethernet 1/0/1
Switch(config-if)# spanning-tree portfast network
Switch(config-if)#
33-7
spanning-tree priority
This command is used to configure the bridge priority. It is only used for RSTP and STP versions. Use the
no
form of this command to restore to the default setting.
