This command displays spanning tree settings and parameters for the switch. The following details are displayed on execution of the command.
| Format | show spanning-tree summary |
| Mode |
|
| Spanning Tree Adminmode | Enabled or disabled. |
| Spanning Tree Version | Version of 802.1 currently supported (IEEE 802.1s, IEEE 802.1w, or IEEE 802.1d) based upon the Force Protocol Version parameter. |
| BPDU Guard Mode | Enabled or disabled. |
| BPDU Filter Mode | Enabled or disabled. |
| Configuration Name | Identifier used to identify the configuration currently being used. |
| Configuration Revision Level | Identifier used to identify the configuration currently being used. |
| Configuration Digest Key | A generated Key used in the exchange of the BPDUs. |
| Configuration Format Selector | Specifies the version of the configuration format being used in the exchange of BPDUs. The default value is zero. |
| MST Instances | List of all multiple spanning tree instances configured on the switch. |
The following example shows CLI display output for the command.
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Download EPUB(Extreme 220) (Routing) #show spanning-tree summary
Spanning Tree Adminmode........... Enabled
Spanning Tree Version............. IEEE 802.1s
BPDU Guard Mode................... Disabled
BPDU Filter Mode.................. Disabled
Configuration Name................ ****
Configuration Revision Level...... ****
Configuration Digest Key.......... ****
Configuration Format Selector..... 0
No MST instances to display.