Cisco 7609 Configuration Manual page 243

Chapter 16 Configuring Optional STP Features
To enable the default PortFast configuration, perform this task:
Command
Step 1
Router(config)# spanning-tree portfast default
Step 2
Router(config)# show spanning-tree summary totals
Step 3
Router(config)# show spanning-tree interface x
detail
Step 4
Router(config-if)# spanning-tree portfast trunk
Step 5
Router# show spanning-tree interface fastEthernet
x detail
This example shows how to enable the default PortFast configuration:
Router# configure terminal
Enter configuration commands, one per line.
Router(config)# spanning-tree portfast default
Router(config)# ^Z
Root bridge for:VLAN0010
EtherChannel misconfiguration guard is enabled
Extended system ID
Portfast
PortFast BPDU Guard
Portfast BPDU Filter is disabled by default
Loopguard
UplinkFast
BackboneFast
Pathcost method used is long
Name
---------------------- -------- --------- -------- ---------- ----------
VLAN0001
VLAN0010
---------------------- -------- --------- -------- ---------- ----------
2 vlans
Router#
Router# show spanning-tree interface fastEthernet 4/4 detail
Port 196 (FastEthernet4/4) of VLAN0010 is forwarding
Port path cost 1000, Port priority 160, Port Identifier 160.196.
Designated root has priority 32768, address 00d0.00b8.140a
Designated bridge has priority 32768, address 00d0.00b8.140a
Designated port id is 160.196, designated path cost 0
Timers:message age 0, forward delay 0, hold 0
Number of transitions to forwarding state:1
The port is in the portfast mode by default
Link type is point-to-point by default
BPDU:sent 10, received 0
Router(config-if)# spanning-tree portfast trunk
%Warning:portfast should only be enabled on ports connected to a single
host. Connecting hubs, concentrators, switches, bridges, etc... to this
interface
Use with CAUTION
Router(config-if)# ^Z
78-14064-04
is disabled
is enabled by default
is disabled by default
is disabled by default
is disabled
is disabled
Blocking Listening Learning Forwarding STP Active
0
0
0
when portfast is enabled, can cause temporary bridging loops.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
Purpose
Configures the PortFast default.
Verifies the global configuration.
Verifies the effect on a specific port.
Enables the PortFast trunk on a port
Verifies the configuration.
End with CNTL/Z.
0 0 1
0 0 2
0 0 3
Enabling PortFast
1
2
3
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