Digital Data Communications Level One GTL-2091 Manuel - Page 3

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Chapter 1 STP Optional Characteristic Configuration

1.1 STP Optional Characteristic Configuration Commands

1.1.1

spanning-tree portfast

Description
To enable bridge protocol data unit (BPDU) filtering by default on all PortFast ports,
use the spanning-tree portfast command in global configuration mode. To return to
the default settings, use the negative form of this command.
spanning-tree portfast {bpdufilter default | bpduguard default | default}
no spanning-tree portfast {bpdufilter default | bpduguard default | default}
To enable PortFast mode where the interface is immediately put into the forwarding
state upon linkup without waiting for the timer to expire, use the spanning-tree portfast
command in interface configuration mode. To return to the default settings, use the
negative form of this command.
spanning-tree portfast [disable | trunk]
no spanning-tree portfast
Parameter
Parameter
bpdufilter default
bpduguard default
default
Default
Disabled
Instruction
In SSTP/PVST mode, the Port Fast characteristic makes a port immediately enter
Forwarding state without experiencing any status change process. This configuration is
invalid in RSTP/MSTP mode.
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STP Optional Characteristic Configuration Commands
Commands
Enables bpdu flter.
Enables bpdu guard.
Specifies the default method.
Description
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