TechLibrary

Table of Contents

Guide That Contains This Content

[+] Expand All

[-] Collapse All

Monitoring Spanning-Tree Protocols

Purpose

Use the monitoring feature to view status and information about the spanning-tree protocol parameters on your EX Series switch.

Action

To display spanning-tree protocol parameter details in the J-Web interface, select Monitor > Switching > STP.

To display spanning-tree protocol parameter details in the CLI, enter the following commands:

show spanning-tree interface
show spanning-tree bridge

Meaning

Table 1 summarizes the spanning-tree protocol parameters.

Table 1: Summary of Spanning-Tree Protocols Output Fields

Field	Values
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.
Hello Time	The time for which the bridge interface remains in the listening or learning state.
Forward Delay	The time for which the bridge interface remains in the listening or learning state before transitioning to the forwarding state.
Extended System ID	The system 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.
Spanning Tree Interface Details
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.
Designated Bridge ID	ID of the designated bridge to which the interface is attached.
Port Cost	Configured cost for the interface.
Port State	STP port state: Forwarding (FWD) Blocking (BLK) Listening Learning Disabled
Role	MSTP or RSTP port role, Designated (DESG), backup (BKUP), alternate (ALT), or root.
Spanning Tree Statistics of Interface
Interface	Interface for which statistics is being displayed.
BPDUs Sent	Total number of BPDUs sent.
BPDUs Received	Total number of BPDUs received.
Next BPDU Transmission	Number of seconds until the next BPDU is scheduled to be sent.