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Monitoring Spanning Tree

To view status and information about the spanning tree interface parameters, select Monitor>Switching>Spanning Tree in the J-Web interface or enter the following CLI commands:

Table 46 summarizes the Spanning Tree output fields.

Table 46: Summary of Spanning Tree Output Fields



Additional Information

Spanning Tree Bridge Parameters

Context ID

An internally generated identifier.


Enabled Protocol

Spanning tree protocol type enabled.


Root ID

Bridge ID of the elected spanning tree root bridge.

The bridge ID consists of a configurable bridge priority and the MAC address of the bridge.

Bridge ID

Locally configured bridge ID.


Inter instance ID

An internally generated instance identifier.


Maximum age

Maximum age of received bridge protocol data units (BPDUs).


Number of topology changes

Total number of STP topology changes detected since the switch last booted.

Interface List

Interface Name

Interface configured to participate in the STP instance.


Port ID

Logical interface identifier configured to participate in the STP instance.


Designated Port ID

Port ID of the designated port for the LAN segment to which the interface is attached.


Port Cost

Configured cost for the interface.



STP port state. Forwarding (FWD), blocking (BLK), listening, learning, or disabled.



MSTP or RSTP port role. Designated (DESG), backup (BKUP), alternate (ALT), or root.


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