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3.13 STP Configuration
The Spanning Tree Protocol (STP) is a standardized method (IEEE 802.1D) for avoiding loops in switched
networks. When STP is enabled, the switch ensures that only one path is active between any two nodes
on the network at a time. It is recommended that you enable STP on all switches to ensure a single active
path on the network.
3.13.1 STP
Status
The STP Status page (Figure 3-41) displays the current STP status on the switch.
Figure 3-41: STP Status Page
STP State:
Shows whether STP is enabled or disabled.
Bridge ID:
Shows the switch’s bridge ID which is the MAC address of this switch.
Bridge Priority:
Shows this switch’s current bridge priority setting. Default is 32768.
Designated Root:
Shows the root bridge ID of this network segment. If this switch is a root bridge, the
“Designated Root” will be the same as this switch’s bridge ID.
Designated Priority:
Shows the current root bridge priority.
Root Port:
Shows the port number connected to root bridge with the lowest path cost. Will be 0 if the
current switch is the root.
Root Path Cost:
Shows the path cost between the root port and the designated port of the root bridge.
Will be 0 if the current switch is the root.
Current Max. Age:
Shows the current root bridge maximum age time. The maximum age time is used to
monitor if the STP topology needs to change. When a bridge does not receive a hello message from the
root bridge before the maximum age time counts down to 0, the bridge will treat the root bridge as
unavailable and will issue a Topology Change Notification (TCN) BPDU to all other bridges. At this time,
all bridges in the LAN will re-learn and determine which switch is the new root bridge. Maximum Age time
is assigned by the root bridge. Default is 20 seconds.
Current Forward Delay:
Shows the current root bridge forward delay time. The value of Forward Delay
time is set by the root. The Forward Delay time is defined as the time spent from Listening state moving to
Learning state or from Learning state moving to Forwarding state of a port in a bridge.
Hello Time:
Shows the current hello time of the root bridge. Hello time is a time interval specified by the
root bridge used to request that all other bridges periodically send hello message every “hello time”