Displays spanning-tree information. If no port is specified, information for all ports is displayed.
Prolog information
Metadata
Keywords:
Syntax
show spantree [module[/port]]
Parameters
Parameter
Description
Possible Values
Default Value
module
Number of the module
port
Number of the port on the module
User level
read-only
Context
general
Example
To display spanning tree information for all ports:
Spanning tree state is enabled Designated Root: 00-04-0d-ea-b0-2d Designated Root Priority: 32768 Designated Root Cost: 0 Designated Root Port: No root port, Bridge is Designated root Root Max Age: 20 Hello Time: 2 Root Forward Delay: 15 Bridge ID MAC ADDR: 00-04-0d-ea-b0-2d Bridge ID priority: 32768 Bridge Max Age: 20 Bridge Hello Time: 2 Bridge Forward Delay: 15 Tx Hold Count 3 Spanning Tree Version is rapid spanning tree Spanning Tree Default Path Costs is according to common spanning tree Port State Cost Priority ------ ------------- ---------- ------------ 6/5 not-connected 4 128 10/6 not-connected 4 128
Output fields:
Field
Description
Spanning tree
Spanning-Tree Protocol status (enabled or disabled)
Designated root
MAC address of the designated spanning-tree root bridge
Designated Root Priority
Priority of the designated root bridge
Designated Root Cost
Total path cost to reach the root
Designated Root Port
Port through which the root bridge can be reached (shown only on non root bridges)
Root Max Age
Amount of time a BPDU packet should be considered valid
Hello Time
Number of times the root bridge sends BPDUs
Bridge ID MAC ADDR
Bridge MAC address used in the sent BPDUs
Bridge ID Priority
Bridge Priority
Port
Port number
State
Spanning-tree port state (disabled, inactive, not-connected, blocking, listening, learning, forwarding, bridging, or type-pvid-inconsistent)
