Supported Platforms
Related Documentation
- EX Series
- show spanning-tree interface
- show spanning-tree bridge
- Configuring Spanning-Tree Protocols (J-Web Procedure)
- Configuring STP (CLI Procedure)
- Example: Configuring Network Regions for VLANs with MSTP on EX Series Switches
- Example: Faster Convergence and Improved Network Stability with RSTP on EX Series Switches
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 | |
Routing instance name Note: The option is supported only on EX4300 switches. | Displays bridge information for the specified routing instance. |
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. |
Root cost | Calculated cost to reach the root bridge from the bridge where the command is entered. |
Root port | Interface that is the current elected root port for this 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 spanning-tree protocol topology changes detected since the switch last booted. |
Time since last topology change Note: This option is supported only on EX4300 switches. | Number of seconds elapsed since the last topology change. |
Spanning Tree Interface Details | |
Interface Name | Interface configured to participate in the spanning-tree protocol instance. |
Port ID | Logical interface identifier configured to participate in the spanning-tree protocol 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 | Spanning-tree protocol port state:
|
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. |
Related Documentation
- EX Series
- show spanning-tree interface
- show spanning-tree bridge
- Configuring Spanning-Tree Protocols (J-Web Procedure)
- Configuring STP (CLI Procedure)
- Example: Configuring Network Regions for VLANs with MSTP on EX Series Switches
- Example: Faster Convergence and Improved Network Stability with RSTP on EX Series Switches
Published: 2015-04-08
Supported Platforms
Related Documentation
- EX Series
- show spanning-tree interface
- show spanning-tree bridge
- Configuring Spanning-Tree Protocols (J-Web Procedure)
- Configuring STP (CLI Procedure)
- Example: Configuring Network Regions for VLANs with MSTP on EX Series Switches
- Example: Faster Convergence and Improved Network Stability with RSTP on EX Series Switches
