Enabling Portfast; Disabling Portfast - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Configuring PortFast

Enabling PortFast

Use PortFast only when you connect a single end station to a switch port; otherwise, you might create
Caution
a network loop.
To enable PortFast on a switch port, perform this task in privileged mode:
Task
Step 1 Enable PortFast on a switch port connected to a
single workstation or server.
Step 2 Verify the PortFast setting.
This example shows how to enable PortFast on a port and verify the configuration (the PortFast status
is shown in the "Fast-Start" column):
Console> (enable) set spantree portfast 4/1 enable
Warning: Spantree port fast start should only be enabled on ports connected
to a single host. Connecting hubs, concentrators, switches, bridges, etc. to
a fast start port can cause temporary spanning tree loops. Use with caution.
Spantree port 4/1 fast start enabled.
Console> (enable) show spantree 4/1
Port
--------- ----
4/1
4/1
4/1
4/1
4/1
4/1
4/1
4/1
Console> (enable)

Disabling PortFast

To disable PortFast on a switch port, perform this task in privileged mode:
Task
Step 1 Disable PortFast on a switch port.
Step 2 Verify the PortFast setting.
This example shows how to disable PortFast on a port:
Console> (enable) set spantree portfast 4/1 disable
Spantree port 4/1 fast start disabled.
Console> (enable)
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
9-8
Chapter 9
Vlan Port-State Cost
------------- -----
1 blocking
100 forwarding
521 blocking
522 blocking
523 blocking
524 blocking
1003 not-connected
1005 not-connected
Configuring Spanning Tree PortFast, UplinkFast, BackboneFast, and Loop Guard
Command
set spantree portfast mod/port enable
show spantree mod/port
Priority Fast-Start
-------- ----------
19 20 enabled
10 20 enabled
19 20 enabled
19 20 enabled
19 20 enabled
19 20 enabled
19 20 enabled
19 4 enabled
Command
set spantree portfast mod/port disable
show spantree mod/port
Group-method
------------
78-13315-02