Dell PowerConnect 5548 User Guide - Page 437
BPDU Guard, Root Guard, Port State, Disabled, Blocking, Listening, Learning, Forwarding, Designated
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- BPDU Guard - Check to enable BPDU Guard on the port. - Root Guard - Check to prevent devices outside the network core from being assigned the spanning tree root. - Port State - Displays the current STP state of a port. If the port state is not disabled, it determines what forwarding action is taken on traffic. The possible port states are: • Disabled - STP is currently disabled on the port. The port forwards traffic while learning MAC addresses. • Blocking - The port is currently blocked and cannot be used to forward traffic or learn MAC addresses. Blocking is displayed when Classic STP is enabled. • Listening - The port is currently in the listening mode. The port cannot forward traffic nor can it learn MAC addresses. • Learning - The port is currently in the learning mode. The port cannot forward traffic, however it can learn new MAC addresses. • Forwarding - The port is currently in the forwarding mode. The port can forward traffic and learn new MAC addresses. - Role - Displays the port role assigned by the STP algorithm that provides STP paths. The possible options are: • Root - This port provides the lowest cost path to forward packets to root switch. • Designated - This port is the interface through which the bridge is connected to the LAN, which provides the lowest cost path from the LAN to the Root Bridge. • Alternate - This port provides an alternate LAG to the root switch from the root interface. • Backup - This port provides a backup path to the designated port. Backup ports occur only when two ports are connected in a loop by a point-to-point link. Backup ports also occur when a LAN has two or more connections connected to a shared segment. • Disabled - This port is not participating in the Spanning Tree. Dell PowerConnect 55xx Systems User Guide 437