show spanning-tree

Description

Shows the spanning tree mode and information on the RPVST instances and optionally shows details on the RPVST instances.

Command context

Operator (>) or Manager (#)

Parameters

detail

Specifies showing details on the RPVST instances.

[vsx-peer]

Shows the output from the VSX peer switch. If the switches do not have the VSX configuration or the ISL is down, the output from the VSX peer switch is not displayed. This parameter is available on switches that support VSX.

Authority

Operators or Administrators or local user group members with execution rights for this command. Operators can execute this command from the operator context (>) only.

Examples

Showing spanning tree mode and RPVST instance information:

switch# show spanning-tree
Spanning tree status      : Enabled Protocol: RPVST
Extended System-id        : Enabled
Ignore PVID Inconsistency : Enabled
Path cost method          : Long

VLAN1
  Root ID    Priority   : 32768
             MAC-Address: 70:72:cf:31:c9:23
             This bridge is the root
             Hello time(in seconds):2  Max Age(in seconds):20
             Forward Delay(in seconds):15

  Bridge ID  Priority  : 32768
             MAC-Address: 70:72:cf:31:c9:23
             Hello time(in seconds):2  Max Age(in seconds):20
             Forward Delay(in seconds):15

Port         Role           State      Cost    Priority   Type
------------ -------------- ---------- ------- ---------- ----------
1/1/1        Designated     Forwarding 0       128        point_to_point
1/1/5        Designated     Forwarding 0       128        point_to_point

Showing spanning tree mode and detailed RPVST instance information:

switch#show spanning-tree detail
Spanning tree status      : Enabled Protocol: RPVST
Extended System-id        : Enabled
Ignore PVID Inconsistency : Enabled
Path cost method          : Long

VLAN1
  Root ID    Priority   : 32768
             MAC-Address: 70:72:cf:31:c9:23
             This bridge is the root
             Hello time(in seconds):2  Max Age(in seconds):20
             Forward Delay(in seconds):15

  Bridge ID  Priority  : 32768
             MAC-Address: 70:72:cf:31:c9:23
             Hello time(in seconds):2  Max Age(in seconds):20
             Forward Delay(in seconds):15

Port         Role           State      Cost    Priority   Type
------------ -------------- ---------- ------- ---------- ----------
1/1/1        Designated     Forwarding 0       128        point_to_point
1/1/2        Designated     Forwarding 0       128        point_to_point

Topology change flag : False
Number of topology changes : 1
Last topology change occurred : 33293 seconds ago

Port 1/1/1
Designated Root Priority                  : 32768          Address: 48:0F:CF:AF:22:1D
Designated Bridge Priority                : 32768          Address: 48:0F:CF:AF:22:1D
Designated Port                           : 1/1/1
Forwarding-State transitions              : 0
BPDUs sent 1582, received 1506

Port lag1
Designated Root Priority                  : 32768          Address: 48:0F:CF:AF:22:1D
Designated Bridge Priority                : 32768          Address: 48:0F:CF:AF:22:1D
Designated Port                           : lag1
Forwarding-State transitions              : 0
BPDUs sent 1402, received 1316
Multi-chassis role                        : active