Spanning Tree 53
Click Apply to update the switch configuration. Your changes take effect immediately but are not
retained across a switch reset unless you click Save Configuration.
BPDU Guard 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.
BPDU Filter 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.
Spanning Tree Tx Hold
Count
The maximum number of BPDUs that a bridge is allowed to send within a hello time window.
Bridge Identifier 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.
Time Since Topology
Change
The amount of time that has passed since the topology of the spanning tree has changed
since the device was last reset.
Topology Change Count The number of times the topology of the spanning tree has changed.
Topology Change 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.
Designated Root The bridge identifier of the root bridge for the CST. The identifier is made up of the bridge
priority and the base MAC address.
Root Path Cost 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.
Root Port The port on the bridge with the least-cost path to the designated root for the CST.
Max Age The amount of time a bridge waits before implementing a topological change.
Forward Delay The forward delay value for the root port bridge.
Hold Time The minimum amount of time between transmissions of Configuration BPDUs.
CST Regional Root 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.
CST Path Cost The path cost to the CST tree regional root.
Field Description
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