Ubiquiti EdgeSwitch ES-24-250W Administration Manual page 164

EdgeSwitch Administration Guide
™
Field
Bridge Priority
Bridge Max Age
Bridge Hello Time
Bridge Forward Delay
Spanning Tree Maximum
Hops
BPDU Guard
BPDU Filter
Spanning Tree Tx Hold Count
Bridge Identifier
Time Since Topology Change
Topology Change Count
Topology Change
Designated Root
Root Path Cost
Root Port
Max Age
Forward Delay
Hold Time
CST Regional Root
CST Path Cost
Use the buttons to perform the following tasks:
• If you make any configuration changes, click Submit to apply the new settings to the switch.
• Click Refresh to update the information on the screen with the most current data.
To retain the changes across the switch's next power cycle, click System > Configuration Storage > Save.
Ubiquiti Networks, Inc.
Spanning Tree CST Fields
Description
The value that helps determine which bridge in the spanning tree is elected as the root bridge during
STP convergence. A lower value increases the probability that the bridge becomes the root bridge.
The amount of time a bridge waits before implementing a topological change.
The amount of time the root bridge waits between sending hello BPDUs.
The amount of time a bridge remains in a listening and learning state before forwarding packets.
The maximum number of hops a Bridge Protocol Data Unit (BPDU) is allowed to traverse within the
spanning tree region before it is discarded.
When enabled, BPDU Guard can disable edge ports that receive BPDU packets. This prevents a new
device from entering the existing STP topology. Thus devices that were originally not a part of STP are
not allowed to influence the STP topology.
When enabled, this feature filters the BPDU traffic on the edge ports. When spanning tree is disabled
on a port, BPDU filtering allows BPDU packets received on that port to be dropped.
The maximum number of BPDUs that a bridge is allowed to send within a hello time window.
A unique value that is automatically generated based on the bridge priority value and the base MAC
address of the bridge. When electing the root bridge for the spanning tree, if the bridge priorities for
multiple bridges are equal, the bridge with the lowest MAC address is elected as the root bridge.
The amount of time that has passed since the topology of the spanning tree has changed since the
device was last reset.
The number of times the topology of the spanning tree has changed.
Indicates whether a topology change is in progress on any port assigned to the CST. If a change is in
progress the value is True; otherwise, it is False.
The bridge identifier of the root bridge for the CST. The identifier is made up of the bridge priority and
the base MAC address.
The path cost to the designated root for the CST. Traffic from a connected device to the root bridge
takes the least-cost path to the bridge. If the value is 0, the cost is automatically calculated based on
port speed.
The port on the bridge with the least-cost path to the designated root for the CST.
The amount of time a bridge waits before implementing a topological change.
The forward delay value for the root port bridge.
The minimum amount of time between transmissions of Configuration BPDUs.
The bridge identifier of the CST regional root. The identifier is made up of the priority value and the
base MAC address of the regional root bridge.
The path cost to the CST tree regional root.
Configuring Switching Information
163