Spanning-Tree Portfast (Stp) - Allied Telesis AR2050V Command Reference Manual

S T C
PANNING REE OMMANDS
- (STP)
SPANNING TREE PORTFAST

spanning-tree portfast (STP)

Overview Use this command in Interface Configuration mode for a switch port interface only
to set a port as an edge-port. The portfast feature enables a port to rapidly move
to the forwarding state, without having first to pass through the intermediate
spanning tree states. This command has the same effect as the
edgeport (RSTP and MSTP)
the output of some show commands.
NOTE
the syntax these are documented as separate commands. See the following additional
portfast commands:
•
•
You can obtain the same effect by running the
MSTP)
some show commands.
Use the no variant of this command to set a port to its default state (not an
edge-port).
spanning-tree portfast
Syntax
no spanning-tree portfast
Default Not an edge port.
Mode Interface Configuration mode for a switch port interface only.
Usage Portfast makes a port move from a blocking state to a forwarding state, bypassing
both listening and learning states. The portfast feature is meant to be used for
ports connected to end-user devices. Enabling portfast on ports that are
connected to a workstation or server allows devices to connect to the network
without waiting for spanning-tree to converge.
For example, you may need hosts to receive a DHCP address quickly and waiting
for STP to converge would cause the DHCP request to time out. Ensure you do not
use portfast on any ports connected to another device to avoid creating a
spanning-tree loop on the network.
Use this command on a switch port that connects to a LAN with no other bridges
attached. An edge port should never receive BPDUs. Therefore if an edge port
receives a BPDU, the portfast feature takes one of three actions.
•
•
•
C613-50186-01 Rev B
: You can run either of two additional parameters with this command. To simplify
spanning-tree portfast bpdu-filter
spanning-tree portfast bpdu-guard
command. However, the configuration output may display differently in
Cease to act as an edge port and pass BPDUs as a member of a spanning tree
network (spanning-tree portfast (STP)
Filter out the BPDUs and pass only the data and continue to act as a edge
port (spanning-tree portfast bpdu-filter
Block the port to all BPDUs and data
command enabled).
Command Reference for AR2050V
AlliedWare Plus™ Operating System - Version 5.4.7-1.x
command, but the configuration displays differently in
command
command.
spanning-tree edgeport (RSTP and
command disabled).
command enabled).
(spanning-tree portfast bpdu-guard
spanning-tree
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