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Posts Tagged ‘STP’

CCNA 2.7.b: BPDU Guard

Overview: BPDUGuard protects against loops that STP can’t protect against when PortFast is enabled   Study Notes: BPDU Guard complements the functionality of PortFast On PortFast-enabled ports, BPDU Guard provides the protection against Layer 2 loops that STP cannot provide when STP PortFast is enabled In a valid configuration, PortFast Layer 2 LAN interfaces (edge ports) […]


CCNA 2.7.a: PortFast

Overview: PortFast is a Spanning-Tree option that causes a port to immediately come up without going through initial STP learning and listening phases   Study Notes: STP PortFast causes a Layer 2 LAN port configured as an access port to enter the forwarding state immediately, bypassing the listening and learning states You can use PortFast on […]


CCNA 2.7 Configure, verify and troubleshoot STP related optional features

Overview: The optional features of the Spanning Tree Protocol (STP) enhance loop prevention, protect against some possible user misconfigurations, and provide better control over the protocol parameters. Although similar functionality may be incorporated into the IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) standard, we recommend using these extensions. With the exception of PVST Simulation, all […]


CCNA 2.6.b STP root bridge selection

Overview: The first step in STP is the root bridge selection.  From there all other STP decisions are made.   Study Notes: The key to Spanning-Tree Protocol is that a root bridge must be selected to become the focal point in the network All STP decisions in the network are made from the point-of-view of […]


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