show spantree stats

Example

This example shows how to display the device‘s Spanning Tree configuration:

System(rw)->show spantree stats
Spanning tree status         - enabled
Spanning tree instance       - 0
Designated Root MacAddr      - 00-e0-63-9d-c1-c8
Designated Root Priority     - 0
Designated Root Cost         - 10000
Designated Root Port         - lag.0.1
Root Max Age                 - 20 sec
Root Hello Time              - 2  sec
Root Forward Delay           - 15 sec
Bridge ID MAC Address        - 00-01-f4-da-5e-3d
Bridge ID Priority           - 32768
Bridge Max Age               - 20 sec
Bridge Hello Time            - 2  sec
Bridge Forward Delay         - 15 sec
Topology Change Count        - 7
Time Since Top Change        - 00 days 03:19:15
Max Hops                     - 20

show spantree Output Details shows a detailed explanation of command output.

show spantree Output Details

Output...	What it displays...
Spanning tree instance	Spanning Tree ID.
Spanning tree status	Whether Spanning Tree is enabled or disabled.
Designated Root MacAddr	MAC address of the designated Spanning Tree root bridge.
Designated Root Port	Port through which the root bridge can be reached.
Designated Root Priority	Priority of the designated root bridge.
Designated Root Cost	Total path cost to reach the root.
Root Max Age	Amount of time (in seconds) a BPDU packet should be considered valid.
Root Hello Time	Interval (in seconds) at which the root device sends BPDU (Bridge Protocol Data Unit) packets.
Root Forward Delay	Amount of time (in seconds) the root device spends in listening or learning mode.
Bridge ID MAC Address	Unique bridge MAC address, recognized by all bridges in the network.
Bridge ID Priority	Bridge priority, which is a default value, or is assigned using the set spantree priority command. For details, refer to set spantree priority.
Bridge Max Age	Maximum time (in seconds) the bridge can wait without receiving a configuration message (bridge “hello”) before attempting to reconfigure. This is a default value, or is assigned using the set spantree maxage command. For details, refer to set spantree maxage.
Bridge Hello Time	Amount of time (in seconds) the bridge sends BPDUs. This is a default value, or is assigned using the set spantree hello command. For details, refer to set spantree hello.
Bridge Forward Delay	Amount of time (in seconds) the bridge spends in listening or learning mode. This is a default value, or is assigned using the set spantree fwddelay command. For details, refer to set spantree fwddelay.
Topology Change Count	Number of times topology has changed on the bridge.
Time Since Top Change	Amount of time (in days, hours, minutes and seconds) since the last topology change.
Max Hops	Maximum number of hops information for a particular Spanning Tree instance may traverse (via relay of BPDUs within the applicable MST region) before being discarded. This is a default value, or is assigned using the set spantree maxhops command. For details, refer to set spantree maxhops.

Example

This example shows how to display port-specific Spanning Tree information for port ge.1.1.

System(rw)->show spantree stats port ge.1.1
Spanning tree status         - enabled
Spanning tree instance       - 0
Designated Root MacAddr      - 00-e0-63-93-79-0f
Designated Root Priority     - 0
Designated Root Cost         - 0
Designated Root Port         - 0
Root Max Age                 - 20 sec
Root Hello Time              - 2  sec
Root Forward Delay           - 15 sec
Bridge ID MAC Address        - 00-e0-63-93-79-0f
Bridge ID Priority           - 0
Bridge Max Age               - 20 sec
Bridge Hello Time            - 2  sec
Bridge Forward Delay         - 15 sec
Topology Change Count        - 5
Time Since Top Change        - 00 days 03:16:54
Max Hops                     - 20
SID   Port         State              Role          Cost        Priority
---   ----------   ----------------   -----------   --------    --------
0     ge.1.1       Blocking           Disabled      20000       128
Port-Specific show spantree stats Output Details describes the port-specific information displayed.

Port-Specific show spantree stats Output Details

Output...	What it displays...
SID	The Spanning Tree instance.
Port	The port name.
State	The Spanning Tree forwarding state of the port. This value can be Blocking, Forwarding, Listening, or Learning. If the port/SID has been placed in a non-forwarding state for a reason other than normal Spanning Tree protocol operation, an asterisk will be displayed next to the state. You can use the command show spantree nonforwardingreason to display the specific reason.
Role	The Spanning Tree role of the port. The port role is assigned by the Spanning Tree protocol and determines the behavior of the port — either sending or receiving BPDUs, and forwarding or blocking data traffic.
Cost	The port cost.
Priority	The priority of the link in a Spanning Tree bridge. This value can be set with the command clear spantree portpri.