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: Summary of Spanning Tree Output Fields

Field	Values	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.
State	STP port state. Forwarding (FWD), blocking (BLK), listening, learning, or disabled.
Role	MSTP or RSTP port role. Designated (DESG), backup (BKUP), alternate (ALT), or root.