Display the Spanning Tree Status

Variable	Description
`show spanning-tree active`	Displays the detail of the bridge and active ports for all of the active instances. Active ports are those ports that are participating in the spanning tree.
`show spanning-tree detail`	Displays detailed information about the port and bridge for all of the active instances. This information includes designated bridge details, designated port details, timer values, and root bridge details.
`show spanning-tree vlan 10 active`	Displays the detail of the bridge and the active port for the instance corresponding to requested VLAN.
`show spanning-tree vlan 10 detail`	Displays detailed information about the port and bridge. This information includes designated bridge details, designated port details, timer values, and root bridge details.
`show spanning-tree vlan 10 interface interface-id`	Displays spanning tree information for the specified interface.
`show spanning-tree vlan 10 summary`	Displays a summary of port states, or displays the total lines of the STP state section.

The preceding table shows the commands that display the spanning tree status and VLAN 10 is used as command examples. Replace VLAN 10 with a different VLAN ID to review the status for a particular VLAN.

The following examples show how to display general and detailed spanning tree status information. Before running the show commands, ensure that you have run the configuration commands in the previous sections (for example, disabling GVRP, enabling PVRST+, configuring ports as trunk, and enabling VLAN 1, 10, 20, 30, and 40).

Type the following show command in the switch to display general information.

TOR-1 SEFOS# show spanning-tree vlan 10
-------------------------------------------------------------------
Spanning-tree for VLAN 10
Root Id         Priority   32778
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Alternate    Discarding   2000     128    P2P
 
 
TOR-1 SEFOS# show spanning-tree active
 
-------------------------------------------------------------------
Spanning-tree for VLAN 1
Root Id         Priority   32769
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32769
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/45   Designated   Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
-------------------------------------------------------------------
Spanning-tree for VLAN 10
Root Id         Priority   32778
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
-------------------------------------------------------------------
Spanning-tree for VLAN 20
Root Id         Priority   32788
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32788
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
-------------------------------------------------------------------
Spanning-tree for VLAN 30
Root Id         Priority   32798
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32798
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
-------------------------------------------------------------------
Spanning-tree for VLAN 40
Root Id         Priority   32808
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32808
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
TOR-1 SEFOS#

Type the following show command to display detailed information.

TOR-1 SEFOS# show spanning-tree detail
 
Bridge is executing the rstp compatible PVRST Protocol
Bridge Identifier has priority 32769, Address 00:14:4f:6c:69:ed
Configured Hello time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Number of Topology Changes 9
Time since topology Change 0 seconds ago
Transmit Hold-Count 3
Max Age 20 Sec, Forward Delay 15 Sec, Hello Time 2 Sec
 
Port 1 [Ex0/1] of VLAN 1 is Root      , Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.1
Designated Root has priority 32769, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32769, address 00:14:4f:6c:56:6f
Designated Port Id is 128.3, Designated PathCost 0
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :2
BPDUs : sent 33 , recieved 46616
 
Port 45 [Ex0/45] of VLAN 1 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.45
Designated Root has priority 32769, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32769, address 00:14:4f:6c:69:ed
Designated Port Id is 128.45, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :4
BPDUs : sent 12993 , recieved 0
 
Port 57 [Ex0/57] of VLAN 1 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.57
Designated Root has priority 32769, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32769, address 00:14:4f:6c:69:ed
Designated Port Id is 128.57, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :3
BPDUs : sent 44091 , recieved 2190
 
Bridge is executing the rstp compatible PVRST Protocol
Bridge Identifier has priority 32778, Address 00:14:4f:6c:69:ed
Configured Hello time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Number of Topology Changes 2
Time since topology Change 0 seconds ago
Transmit Hold-Count 3
Max Age 20 Sec, Forward Delay 15 Sec, Hello Time 2 Sec
 
Port 1 [Ex0/1] of VLAN 10 is Root      , Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.1
Designated Root has priority 32778, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32778, address 00:14:4f:6c:56:6f
Designated Port Id is 128.3, Designated PathCost 0
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :3
BPDUs : sent 16 , recieved 46611
 
Port 57 [Ex0/57] of VLAN 10 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.57
Designated Root has priority 32778, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32778, address 00:14:4f:6c:69:ed
Designated Port Id is 128.57, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :6
BPDUs : sent 4860 , recieved 41443
 
Bridge is executing the rstp compatible PVRST Protocol
Bridge Identifier has priority 32788, Address 00:14:4f:6c:69:ed
Configured Hello time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Number of Topology Changes 0
Time since topology Change 0 seconds ago
Transmit Hold-Count 3
Max Age 20 Sec, Forward Delay 15 Sec, Hello Time 2 Sec
 
Port 1 [Ex0/1] of VLAN 20 is Root      , Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.1
Designated Root has priority 32788, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32788, address 00:14:4f:6c:56:6f
Designated Port Id is 128.3, Designated PathCost 0
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :1
BPDUs : sent 4 , recieved 46607
 
Port 57 [Ex0/57] of VLAN 20 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.57
Designated Root has priority 32788, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32788, address 00:14:4f:6c:69:ed
Designated Port Id is 128.57, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :3
BPDUs : sent 46280 , recieved 2
 
Bridge is executing the rstp compatible PVRST Protocol
Bridge Identifier has priority 32798, Address 00:14:4f:6c:69:ed
Configured Hello time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Number of Topology Changes 0
Time since topology Change 0 seconds ago
Transmit Hold-Count 3
Max Age 20 Sec, Forward Delay 15 Sec, Hello Time 2 Sec
 
Port 1 [Ex0/1] of VLAN 30 is Root      , Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.1
Designated Root has priority 32798, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32798, address 00:14:4f:6c:56:6f
Designated Port Id is 128.3, Designated PathCost 0
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :1
BPDUs : sent 4 , recieved 46608
 
Port 57 [Ex0/57] of VLAN 30 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.57
Designated Root has priority 32798, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32798, address 00:14:4f:6c:69:ed
Designated Port Id is 128.57, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :3
BPDUs : sent 46281 , recieved 2
Bridge is executing the rstp compatible PVRST Protocol
Bridge Identifier has priority 32808, Address 00:14:4f:6c:69:ed
Configured Hello time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Number of Topology Changes 3
Time since topology Change 0 seconds ago
Transmit Hold-Count 3
Max Age 20 Sec, Forward Delay 15 Sec, Hello Time 2 Sec
 
Port 1 [Ex0/1] of VLAN 40 is Root      , Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.1
Designated Root has priority 32808, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32808, address 00:14:4f:6c:56:6f
Designated Port Id is 128.3, Designated PathCost 0
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :1
BPDUs : sent 6 , recieved 46608
 
Port 57 [Ex0/57] of VLAN 40 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.57
Designated Root has priority 32808, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32808, address 00:14:4f:6c:69:ed
Designated Port Id is 128.57, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :3
BPDUs : sent 46281 , recieved 2
 
TOR-1 SEFOS#

Type the following show command to display the general spanning-tree information for a VLAN (VLAN 10 in this example).

TOR-1 SEFOS# show spanning-tree vlan 10 active
 
-------------------------------------------------------------------
Spanning-tree for VLAN 10
Root Id         Priority   32778
                Address    00:14:4f:6c:56:6f
                Cost       2000
                Port       Ex0/1
                Hello Time 2 Sec, Max Age 20 Sec, Forward Delay 15 Sec
 
Spanning Tree Enabled Protocol PVRST
Bridge Id       Priority 32778
                Address 00:14:4f:6c:69:ed
                Hello Time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Name     Role         State        Cost     Prio   Type
----     ----         -----        ----     ----   ------
Ex0/1    Root         Forwarding   2000     128    P2P
Ex0/57   Designated   Forwarding   2000     128    P2P
 
TOR-1 SEFOS#

Type the following show command to display the detailed information for a VLAN (VLAN 10 in this example).

TOR-1 SEFOS# show spanning-tree vlan 10 detail
 
Bridge is executing the rstp compatible PVRST Protocol
Bridge Identifier has priority 32778, Address 00:14:4f:6c:69:ed
Configured Hello time 2 sec, Max Age 20 sec, Forward Delay 15 sec
Number of Topology Changes 2
Time since topology Change 0 seconds ago
Transmit Hold-Count 3
Max Age 20 Sec, Forward Delay 15 Sec, Hello Time 2 Sec
Port 1 [Ex0/1] of VLAN 10 is Root      , Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.1
Designated Root has priority 32778, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32778, address 00:14:4f:6c:56:6f
Designated Port Id is 128.3, Designated PathCost 0
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :3
BPDUs : sent 16 , recieved 46694
Port 57 [Ex0/57] of VLAN 10 is Designated, Forwarding
Port PathCost 2000     , Port Priority 128      , Port Identifier  128.57
Designated Root has priority 32778, address 00:14:4f:6c:56:6f
Designated Bridge has priority 32778, address 00:14:4f:6c:69:ed
Designated Port Id is 128.57, Designated PathCost 2000
Timers: Hello Time - 2, MaxAge - 20, Forward Delay - 15, Hold - 1
No of Transitions to forwarding State :6
BPDUs : sent 4942 , recieved 41443
 
TOR-1 SEFOS#

Type the following show command to display the detailed information for a VLAN interface (0/1 in this example).

TOR-1 SEFOS# show spanning-tree vlan 10 interface extreme-ethernet 0/1
 
Role         State        Cost     Prio
----         -----        ----     ----
Root         Forwarding   2000     128
TOR-1 SEFOS#

Type the following show command to display the spanning-tree summary for a VLAN (VLAN 10 in this example).

TOR-1 SEFOS# show spanning-tree vlan 10 summary
 
Spanning tree enabled protocol is PVRST
Spanning-tree pathcost method is long
 
PVRST Port Roles and States
Port-Index  Port-Role    Port-State   Port-Status
----------  ---------    ----------   -----------
1           Root         Forwarding   Enabled
57          Designated   Forwarding   Enabled
 
TOR-1 SEFOS#

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Display the Spanning Tree Status