220 CHAPTER 11: CONFIGURING SPANNING TREE
the Forwarding state when the port link is up. Fast Link optimizes the
STP protocol convergence. STP convergence can take 30-60 seconds
in large networks.
■ Root Guard — Restricts the interface from acting as the root port of the
switch.
■ Port State — Displays the current STP state of a port. If enabled, the
port state determines what forwarding action is taken on traffic.
Possible port states are:
■ Forwarding — Indicates that the port forwards traffic while
learning MAC addresses.
■ Port Role — Displays the port role assigned by the STP algorithm to
provide to STP paths. The possible field values are:
■ Root — Provides the lowest cost path to forward packets to the
root switch.
■ Designated — The port or LAG through which the designated
switch is attached to the LAN.
■ Alternate — Provides an alternate path to the root switch from the
root interface.
■ Backup — Provides a backup path to the designated port path
toward the Spanning Tree leaves. Backup ports occur only when
two ports are connected in a loop by a point-to-point link, or when
a LAN has two or more connections connected to a shared
segment.
■ Disabled — The port is not participating in the Spanning Tree.
■ Speed — Indicates the speed at which the port is operating.
■ Path Cost — Indicates the port contribution to the root path cost. The
path cost is adjusted to a higher or lower value, and is used to forward
traffic when a path is re-routed.
■ Priority — Priority value of the port. The priority value influences the
port choice when a bridge has two ports connected in a loop. The
priority range is between 0 -240. The priority value is determined in
increments of 16.
■ Designated Bridge ID — Indicates the bridge priority and the MAC
Address of the designated bridge.
■ Designated Port ID — Indicates the selected port priority and
interface.
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