![]() Understanding How PortFast BPDU Guard Works When you enable PortFast on a switch or trunk port, the port is immediately transitioned to the spanning tree forwarding state. When the Forward Delay timer expires a second time, the port is transitioned to the forwarding or blocking state. When the Forward Delay timer expires, the port enters the learning state. When the switch powers up, or when a device is connected to a port, the port enters the spanning tree listening state. If you enable PortFast on a port that is connected to another Layer 2 device, such as a switch, you might create network loops. You can use PortFast on switch or trunk ports that are connected to a single workstation, switch, or server to allow those devices to connect to the network immediately, instead of waiting for the port to transition from the listening and learning states to the forwarding state.Ĭaution You can use PortFast to connect a single end station or a switch port to a switch port. PortFast causes a switch or trunk port to enter the spanning tree forwarding state immediately, bypassing the listening and learning states. Configuring Loop Guard Understanding How PortFast Works.Understanding How PortFast BPDU Filtering Works.Understanding How PortFast BPDU Guard Works. ![]() Note For complete syntax and usage information for the commands that are used in this chapter, refer to the Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command Reference. This chapter describes how to configure the PortFast, BPDU guard, BPDU filter, UplinkFast, BackboneFast, and loop guard spanning tree enhancements on the Catalyst enterprise LAN switches. Understanding How PortFast BPDU Filtering Works Configuring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard Table Of ContentsĬonfiguring Spanning Tree PortFast, BPDU Guard, BPDU Filter, UplinkFast, BackboneFast, and Loop Guard
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