Dell PowerConnect 5548P System User's Manual page 445

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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.
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Dell PowerConnect 55xx Systems User Guide
Contax\CxUGSwitching_STP.fm