Cisco WS-C2980G-A Software Guide - Page 167
Resetting PortFast, Configuring PortFast BPDU Guard
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Chapter 8 Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard Configuring PortFast BPDU Guard Resetting PortFast To reset PortFast on a switch or trunk port to its default settings, perform this task in privileged mode: Step 1 Step 2 Task Reset PortFast to its default settings on a switch port. Verify the PortFast setting. Command set spantree portfast mod_num/port_num default show spantree mod_num/port_num 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 The following sections describe how to configure PortFast BPDU guard on the switch. 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. The port configuration overrides the global configuration unless the port configuration is set to default. If the port configuration is set to default, the global configuration is checked. If the port configuration is enabled, the port configuration is used and the global configuration is not used. To enable and verify PortFast BPDU guard on a nontrunking switch port, perform this task in privileged mode: Step 1 Step 2 Task Command Enable BPDU guard on an individual port. set spantree portfast bpdu-guard mod/port [disable | enable | default] Verify the PortFast BPDU guard setting. show spantree summary Note For additional PVST+ information, see Chapter 7, "Configuring Spanning Tree." 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-11
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