Cisco Catalyst 4500 series Administration Manual page 710

Enabling PortFast BPDU Filtering
Switch(config)# Ctrl-Z
This example shows how to verify the BPDU configuration in PVST+ mode:
Switch# show spanning-tree summary totals
Root bridge for:VLAN0010
EtherChannel misconfiguration guard is enabled
Extended system ID
Portfast
PortFast BPDU Guard
Portfast BPDU Filter is enabled by default
Loopguard
UplinkFast
BackboneFast
Pathcost method used is long
Name
---------------------- -------- --------- -------- ---------- ----------
2 vlans
Switch#
Note For PVST+ information, see
To enable PortFast BPDU filtering, perform this task:
Command
Step 1
Switch(config)# interface fastEthernet 4/4
Step 2
Switch(config-if)# spanning-tree bpdufilter enable
Step 3
Switch# show spanning-tree interface fastethernet 4/4
This example shows how to enable PortFast BPDU filtering on port 4/4:
Switch(config)# interface fastethernet 4/4
Switch(config-if)# spanning-tree bpdufilter enable
Switch(config-if)# ^Z
This example shows how to verify that PortFast BPDU filtering is enabled:
Switch# show spanning-tree interface fastethernet 4/4
Vlan
---------------- ---- --- --------- -------- --------------------------------
VLAN0010
This example shows more detail on the port:
Switch# 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 portfast trunk configuration
Link type is point-to-point by default
Bpdu filter is enabled
BPDU:sent 0, received 0
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
25-10
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
Chapter 22, "Configuring STP and MST."
Role Sts Cost Prio.Nbr Status
Desg FWD 1000 160.196
Chapter 25 Configuring Optional STP Features
0 3 3
Purpose
Selects the interface to configure.
Enables BPDU filtering.
Verifies the configuration.
Edge P2p
OL_28731-01