Reference v4.1.0 Instruction Manual
1166 Network OS Command Reference
53-1003115-01
show spanning-tree brief
2
show spanning-tree brief
Displays the status and parameters of the Spanning Tree Protocol (STP).
Synopsis show spanning-tree [vlan vlan_id] brief
Operands vlan vlan_id Specifies a VLAN. Refer to the Usage Guidelines.
Defaults None
Command Modes Privileged EXEC mode
Description Use this command to display a summary of the status and parameters of STP for each interface,
including the port roles and port states.
The following describes the port roles and states:
• Port roles—root port, designated port, alternate port and backup port.
• Port states—discarding, learning, forwarding, and blocked.
• Port types—edge port (PortFast), point-to-point, and shared port.
Usage Guidelines On the Brocade VDX family of switches, VLANs are treated as interfaces from a configuration point
of view. By default, all the DCB ports are assigned to VLAN 1 (VLAN ID equals 1). Valid VLAN IDs
are as follows:
• On Brocade VDX 8770 switches: 1 through 4086 for 802.1Q VLANs (VLAN IDs 4087
through 4095 are reserved on these switches), and 4096 through 8191 for service or
transport VFs in a Virtual Fabrics context.
On all other Brocade VDX switches: 1 through 3962 for 802.1Q VLANs (VLAN IDs 3963
through 4095 are reserved on these switches), and 4096 through 8191 for service or transport
VFs in a Virtual Fabrics context.When “root guard” is in effect, the show spanning-tree brief
command output shows the port state as ERR, not root_inc.
Examples To display the interface summary of the Spanning Tree Protocol:
switch# show spanning-tree brief
Spanning-tree Mode: Rapid Spanning Tree Protocol
Root ID Priority 32768
Address 0005.1e76.1aa0
Hello Time 2, Max Age 20, Forward Delay 15
Bridge ID Priority 32768
Address 0005.1e76.1aa0
Hello Time 2, Max Age 20, Forward Delay 15, Tx-HoldCount 6
Migrate Time 3 sec
Interface Role Sts Cost Prio Link-type Boundary Edge
-------------------------------------------------------------------------
Te 0/0 DIS DSC 2000 128 P2P Yes No
Te 0/1 ALT BLK 2000 128 P2P Yes No
Te 0/2 RTPT BLK 2000 128 P2P Yes No
Te 0/3 DIS BLK 2000 128 P2P Yes No
Te 0/8 DIS DSC 2000 128 P2P Yes No
Te 0/19 DIS DSC 2000 128 P2P Yes No
Te 0/20 DIS DSC 2000 128 P2P Yes No