This command displays spanning tree settings for the common and internal spanning tree. The following details are displayed.
| Format | show spanning-tree |
| Mode |
|
| Term | Definition |
|---|---|
| Bridge Priority | Specifies the bridge priority for the Common and Internal Spanning tree (CST). The value lies between 0 and 61440. It is displayed in multiples of 4096. |
| Bridge Identifier | The bridge identifier for the CST. It is made up using the bridge priority and the base MAC address of the bridge. |
| Time Since Topology Change | Time in seconds. |
| Topology Change Count | Number of times changed. |
| Topology Change in Progress | Boolean value of the Topology Change parameter for the switch indicating if a topology change is in progress on any port assigned to the common and internal spanning tree. |
| Designated Root | The bridge identifier of the root bridge. It is made up from the bridge priority and the base MAC address of the bridge. |
| Root Path Cost | Value of the Root Path Cost parameter for the common and internal spanning tree. |
| Root Port Identifier | Identifier of the port to access the Designated Root for the CST |
| Bridge Max Age | Derived value. |
| Bridge Max Hops | Bridge max-hops count for the device. |
| Root Port Bridge Forward Delay | Derived value. |
| Hello Time | Configured value of the parameter for the CST. |
| Bridge Hold Time | Minimum time between transmission of Configuration Bridge Protocol Data Units (BPDUs). |
| CST Regional Root | Bridge Identifier of the CST Regional Root. It is made up using the bridge priority and the base MAC address of the bridge. |
| Regional Root Path Cost | Path Cost to the CST Regional Root. |
| Associated FIDs | List of forwarding database identifiers currently associated with this instance. |
| Associated VLANs | List of VLAN IDs currently associated with this instance. |
Example: The following shows example CLI display output for the command.
(Routing) #show spanning-tree
Bridge Priority................................ 32768
Bridge Identifier.............................. 80:00:00:10:18:48:FC:07
Time Since Topology Change..................... 8 day 3 hr 22 min 37 sec
Topology Change Count.......................... 0
Topology Change in progress.................... FALSE
Designated Root................................ 80:00:00:10:18:48:FC:07
Root Path Cost................................. 0
Root Port Identifier........................... 00:00
Bridge Max Age................................. 20
Bridge Max Hops................................ 20
Bridge Tx Hold Count........................... 6
Bridge Forwarding Delay........................ 15
Hello Time..................................... 2
Bridge Hold Time............................... 6
CST Regional Root.............................. 80:00:00:10:18:48:FC:07
Regional Root Path Cost........................ 0
Associated FIDs Associated VLANs
--------------- ----------------
(Routing) #
