Cisco WS-C6506 User Manual

9-11
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
OL-8978-04
Chapter 9 Configuring Spanning-Tree PortFast, UplinkFast, BackboneFast, and Loop Guard
Configuring PortFast BPDU Guard on the Switch
Resetting PortFast
To reset PortFast on a switch or trunk port to its default settings, perform this task in privileged mode:
This example shows how to reset PortFast to its default settings on port 1 of module 4:
Console> (enable) set spantree portfast 4/1 default
Spantree port 4/1 fast start set to default.
Console> (enable) show spantree portfast 4/1
Portfast:default
Portfast BPDU guard is disabled.
Portfast BPDU filter is disabled.
Console> (enable)
Configuring PortFast BPDU Guard on the Switch
These sections describe how to configure PortFast BPDU guard on the switch:
• Enabling PortFast BPDU Guard, page 9-11
• Disabling PortFast BPDU Guard, page 9-12
Enabling PortFast BPDU Guard
The PortFast feature is configured on an individual port and the PortFast BPDU guard option is
configured either globally or on a per-port basis.
When you disable PortFast on a port, PortFast BPDU guard becomes inactive. Port configuration
overrides global configuration unless port configuration is set to default. If port configuration is set to
default, global configuration is checked. If the port configuration is enabled, the port configuration is
used and the global configuration is not used.
To enable PortFast BPDU guard on a nontrunking switch port, perform this task in privileged mode:
Task Command
Step 1
Reset PortFast to its default settings on a switch
port.
set spantree portfast mod_num/port_num
default
Step 2
Verify the PortFast setting. show spantree mod_num/port_num
Task Command
Step 1
Enable BPDU guard on an individual port. set spantree portfast bpdu-guard mod/port
[disable | enable | default]
Step 2
Verify the PortFast BPDU guard setting. show spantree summary

Cisco WS-C6506 Specifications

General

Brand	Cisco
Model	WS-C6506
Category	Switch
Language	English