Cisco 7609 User Manual

16-11
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
78-14064-04
Chapter 16 Configuring Optional STP Features
Enabling BPDU Guard
To enable PortFast BPDU filtering on a nontrunking port, perform this task:
This example shows how to enable PortFast BPDU filtering on a nontrunking port:
Router(config)# interface fastEthernet 4/4
Router(config-if)# spanning-tree bpdufilter enable
Router(config-if)# ^Z
Router# show spanning-tree interface fastEthernet 4/4
Vlan Role Sts Cost Prio.Nbr Status
---------------- ---- --- --------- -------- --------------------------------
VLAN0010 Desg FWD 1000 160.196 Edge P2p
Router# show spanning-tree interface fastEthernet 4/4 detail
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 portfast trunk configuration
Link type is point-to-point by default
Bpdu filter is enabled
BPDU:sent 0, received 0
Router#
Enabling BPDU Guard
To enable BPDU Guard globally, perform this task:
This example shows how to enable BPDU Guard:
Router# configure terminal
Router(config)# spanning-tree portfast bpduguard
Router(config)# end
Router#
Command Purpose
Step 1
Router(config)# interface fastEthernet 4/4
Selects the interface to configure.
Step 2
Router(config-if)# spanning-tree bpdufilter
enable
Enables BPDU filtering.
Step 3
Router# show spanning-tree interface
fastEthernet 4/4
Verifies the configuration.
Command Purpose
Step 1
Router(config)# spanning-tree portfast bpduguard
default
Router(config)# no spanning-tree portfast
bpduguard default
Enables BPDU Guard globally.
Disables BPDU Guard globally.
Step 2
Router(config)# end
Exits configuration mode.
Step 3
Router# show spanning-tree summary totals
Verifies the configuration.

Cisco 7609 Specifications

General

Brand	Cisco
Model	7609
Category	Network Router
Language	English