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Spanning Tree Algorithm Configuration
114
NXA-ENET24 - Software Management Guide
Displaying Global Settings
Field Attributes
• Spanning Tree State: Shows if the switch is enabled to participate in an STA-compliant network.
•Bridge ID: A unique identifier for this bridge, consisting of the bridge priority and MAC address
(where the address is taken from the switch system).
• Max Age: The maximum time (in seconds) a device can wait without receiving a configuration
message before attempting to reconfigure.
All device ports (except for designated ports) should receive configuration messages
at regular intervals.
Any port that ages out STA information (provided in the last configuration message)
becomes the designated port for the attached LAN.
If it is a root port, a new root port is selected from among the device ports attached to
the network.
Note: References to “ports” in this section mean “interfaces,” which includes both
ports and trunks.
• Hello Time: Interval (in seconds) at which the root device transmits a configuration message.
• Forward Delay: The maximum time (in seconds) the root device will wait before changing states (i.e.,
discarding to learning to forwarding). This delay is required because every device
must receive information about topology changes before it starts to forward frames.
In addition, each port needs time to listen for conflicting information that would make
it return to a discarding state; otherwise, temporary data loops might result.
• Designated Root: The priority and MAC address of the device in the Spanning Tree that this switch has
accepted as the root device.
• Root Port – The number of the port on this switch that is closest to the root. This
switch communicates with the root device through this port. If there is no root port,
then this switch has been accepted as the root device of the Spanning Tree
network.
• Root Path Cost – The path cost from the root port on this switch to the root device.
• Configuration
Changes:
The number of times the Spanning Tree has been reconfigured.
• Last Topology
Change:
Time since the Spanning Tree was last reconfigured.
These additional parameters are only displayed for the CLI:
• Spanning tree mode: Specifies the type of spanning tree used on this switch:
• STP: Spanning Tree Protocol (IEEE 802.1D)
• RSTP: Rapid Spanning Tree (IEEE 802.1w)
•Priority: Bridge priority is used in selecting the root device, root port, and designated port.
The device with the highest priority becomes the STA root device. However, if all
devices have the same priority, the device with the lowest MAC address will then
become the root device.
• Root Hello Time: Interval (in seconds) at which this device transmits a configuration message.
• Root Maximum Age: The maximum time (in seconds) this device can wait without receiving a configura-
tion message before attempting to reconfigure.
All device ports (except for designated ports) should receive configuration messages
at regular intervals.
If the root port ages out STA information (provided in the last configuration mes-
sage), a new root port is selected from among the device ports attached to the net-
work.
Note: References to “ports” in this section means “interfaces,” which includes both
ports and trunks.