Dell PowerConnect 5548P System User's Manual page 465

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Boundary port attaches MST bridges to LAN in an outlying region. If
the port is a boundary port, it also indicates whether the device on the
other side of the link is working in RSTP or STP mode.
– Role — Displays the port role assigned by the STP algorithm in order
to provide to 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.
– Interface Priority — Enter the interface priority for specified instance.
– Path Cost (1-200,000,000) — Enter the port contribution to the
Spanning Tree instance. If a loop occurs, the spanning tree considers
path cost when selecting an interface to put in the Forwarding state.
– Default Path Cost — Check to use the default path cost.
– Designated Bridge ID — Displays the bridge ID number that
connects the link or shared LAN to the root.
– Designated Port ID — Displays the Port ID number on the
designated bridge that connects the link or the shared LAN to the
root.
– Designated Cost — Displays the cost of the path from the link or the
shared LAN to the root.
– Forward Transitions — Displays the number of times the port
changed to the forwarding state.
– Remain Hops — Displays the number of hops remaining to the next
destination.
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Dell PowerConnect 55xx Systems User Guide
Contax\CxUGSwitching_STP.fm