Technical data

Table Of Contents

236 Converged Enhanced Ethernet Command Reference

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spanning-tree portfast

Enables the Port Fast feature on an interface to allow the interface to quickly transition to the

forwarding state.

Synopsis spanning-tree portfast {bpdu-filter | bpdu-guard}

Operands bpdu-filter Sets the Port Fast BPDU filter for the port.

bpdu-guard Guards the port against the reception of BPDUs.

Defaults Port Fast is disabled.

Command

Modes

Interface configuration mode

Description Use this command to enable the Port Fast feature. This command is only for STP. Port Fast

immediately puts the interface into the forwarding state without having to wait for the standard

forward time. Use the spanning-tree edgeport command for MSTP and RSTP.

Usage

Guidelines

If you enable spanning-tree portfast bpdu-guard on an interface and the interface receives a BPDU,

the software disables the interface and puts the interface in the ERR_DISABLE state.

Examples To enable a port to quickly transition to the forwarding state:

switch(conf-if-te-0/1)#spanning-tree portfast

To set the Port Fast BPDU filter for the port:

switch(conf-if-te-0/1)#spanning-tree portfast bpdu-filter

To guard the port against the reception of BPDUs:

switch(conf-if-te-0/1)#spanning-tree portfast bpdu-guard