portfast
To enable PortFast on the port, and optionally enable BPDU guard, use the portfast command in MSTP
interface configuration submode.
portfast [bpduguard]
Syntax Description
This command has no keywords or arguments.
Command Default
PortFast is disabled.
Command Modes
MSTP interface configuration
Command History
ModificationRelease
This command was introduced.Release 3.7.1
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
This command enables the portfast feature (also known as edge port). When this is enabled, MSTP treats the
port as an edge port, i.e., it keeps it in forwarding state and does not generate topology changes if the port
goes down or comes up. It is not expected to receive MSTP BPDUs on an edge port. BPDU guard is a Cisco
extension that causes the interface to be shut down using error-disable if an MSTP BPDU is received. For
more information on portfast feature, refer to the Implementing Multiple Spanning Tree Protocol module in
the Cisco ASR 9000 Series Aggregation Services Router L2VPN and Ethernet Services Configuration Guide.
Task ID
OperationsTask ID
read, writeinterface
Examples
The following example shows how to enable PortFast and BPDU guard on the port:
RP/0/RSP0/CPU0:router(config-mstp-if)# portfast
RP/0/RSP0/CPU0:router(config-mstp-if)# portfast bpduguard
Cisco ASR 9000 Series Aggregation Services Router VPN and Ethernet Services Command Reference, Release
6.1.x
558
Multiple Spanning Tree Protocol Commands
portfast
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